Commonwealth v. Millien , 474 Mass. 417 ( 2016 )


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    SJC-11928
    COMMONWEALTH   vs.   OSWELT MILLIEN.
    Middlesex.     December 7, 2015. - June 3, 2016.
    Present:   Gants, C.J., Spina, Cordy, Botsford, Duffly, Lenk, &
    Hines, JJ.
    Assault and Battery. Child Abuse. Evidence, Expert opinion.
    Constitutional Law, Assistance of counsel. Due Process of
    Law, Assistance of counsel. Practice, Criminal, New trial,
    Assistance of counsel.
    Indictments found and returned in the Superior Court
    Department on December 23, 2009.
    The cases were tried before S. Jane Haggerty, J., and a
    motion for a new trial, filed on June 24, 2013, was heard by
    her.
    The Supreme Judicial Court granted an application for
    direct appellate review.
    David Hirsch for the defendant.
    Kate Cimini, Assistant District Attorney, for the
    Commonwealth.
    The following submitted briefs for amici curiae:
    Seth Miller, of Florida, Katherine H. Judson, of Wisconsin,
    Adam W. Deitch & Lindsay A. Olson, of New York, & Mark W. Batton
    for The Innocence Network.
    Heather Kirkwood, of Washington, & David E. Meier for David
    Ayoub & others.
    2
    Matthew R. Segal, Dennis Shedd, & Chauncey B. Wood for
    Committee for Public Counsel Services & others.
    GANTS, C.J.   On the evening of October 20, 2009, the
    defendant's six month old daughter, Jahanna, was rushed to the
    emergency room, unconscious and unresponsive.   She was diagnosed
    with traumatic brain injury, and scans of her brain showed
    retinal hemorrhages, subdural hematoma, and brain swelling, the
    three symptoms known as "the triad" associated with shaken baby
    syndrome.   The defendant, who was the baby's sole caretaker when
    she became unconscious, claimed that Jahanna accidentally fell
    backwards from the couch where she was sitting and landed on the
    wooden floor.   After Jahanna's physicians concluded that her
    brain injuries could not have been caused by an accidental fall
    from the couch but were instead caused by a violent shaking, the
    defendant was charged and later convicted by a jury of assault
    and battery on a child causing substantial bodily injury (head
    injuries), in violation of G. L. c. 265, § 13J (b), and assault
    and battery on a child causing bodily injury (fractured
    vertebrae), in violation of G. L. c. 265, § 13J (a).1
    There is a heated debate in the medical community as to
    whether a violent shaking of a baby alone can generate enough
    1
    The defendant was found not guilty on two indictments
    alleging assault and battery on a child causing bodily injury
    (fractured tibia and fractured ribs), in violation of G. L.
    c. 265, § 13J (a).
    3
    force to cause the triad of symptoms of traumatic brain injury,
    and as to whether these symptoms can sometimes be caused by a
    short accidental fall.    At trial, the jury heard only one side
    of this debate, because the defense attorney did not retain a
    medical expert to offer opinion testimony or to assist him in
    cross-examining the Commonwealth's medical experts.     We conclude
    that, in these circumstances, where the prosecution's case
    rested almost entirely on medical expert testimony, the
    defendant was denied his constitutional right to the effective
    assistance of counsel because, by not providing the jury with
    the other side of this debate, his attorney's poor performance
    "likely deprived the defendant of an otherwise available,
    substantial ground of defence."    See Commonwealth v. Saferian,
    
    366 Mass. 89
    , 96 (1974).2
    Background.   1.    Evidence at trial.   We summarize the
    evidence presented at trial.    The defendant was in his early
    twenties when his girl friend, Amanda Leavitt, told him that she
    was pregnant.   He urged her to "keep" the baby, and accompanied
    her to medical appointments during the pregnancy.      Although he
    was disappointed when he learned that Leavitt was going to have
    2
    We acknowledge the amicus briefs submitted by The
    Innocence Network and "concerned physicians and scientists," and
    the amicus brief jointly submitted by the American Civil
    Liberties Union of Massachusetts, the Committee for Public
    Counsel Services, and the Massachusetts Association of Criminal
    Defense Lawyers.
    4
    twin girls, preferring a boy, he was happy when the girls,
    Jahanna and Taeja, were born on March 27, 2009, and was with
    Leavitt in the operating room when she had her cesarean section.
    Before the babies were born, Leavitt moved to the home of
    her mother, Dianna Gagnon, who lived with her boy friend and
    Leavitt's teenaged siblings in Woburn.   The defendant visited
    nearly every day and generally stayed overnight after the twins
    were born.   The defendant shared the responsibilities of child
    care with Leavitt; he fed, changed, and played with the twins
    daily.   When the twins were approximately five months old,
    Leavitt found a job at a restaurant, working several nights a
    week from between 4 and 5 P.M. to between 9 P.M. and midnight,
    and during that time the defendant, Leavitt's mother, or the
    defendant's mother or sister cared for the twins.   In September,
    2009, Leavitt and the twins moved to a townhouse apartment in
    Woburn, and the defendant lived there with them.
    The defendant was inexperienced in caring for babies, but
    he sought advice regarding child care from Leavitt and Gagnon.
    No witness ever saw him spank or abuse the twins, but at times,
    he patted the twins too roughly while trying to burp them and on
    a few occasions walked away from the changing table while he was
    changing them.   He was responsive to criticism, however, when
    other caretakers instructed him how better to care for the
    twins.   Jahanna was the fussier baby, and the defendant was more
    5
    comfortable caring for Taeja than he was caring for Jahanna.
    But when Jahanna was colicky, the defendant sometimes would pick
    her up and walk around and talk with her.    Gagnon described the
    defendant as a man of quiet demeanor whom she never saw angry
    and never heard shout, and whom she never saw hit or grab
    anyone.
    There were no complications regarding the twins' birth, but
    Jahanna soon developed various health problems.    She was
    "cranky," cried often, and was difficult to feed.     When Jahanna
    was approximately two months old, her primary care pediatrician,
    Dr. Elizabeth Burba, placed her on a more gentle formula.      Nine
    days later, Leavitt telephoned the doctor's office and reported
    that Jahanna had vomited blood.    She was referred to the
    emergency room at Winchester Hospital, where she was diagnosed
    with gastro-esophageal reflux and was prescribed antacid
    medication.   Dr. Burba noted at Jahanna's three-month "well
    visit" that she was "taking her feeds now" and gaining weight.
    Leavitt discontinued using the medication after "a couple of
    months" because Jahanna was doing well.     When Jahanna was
    approximately four months old, Leavitt noticed that one of her
    legs "would kind of be limp."     She testified, "I would hold her
    up and one leg would be touching the ground and one would be in
    the air, like a bend in the knee."    Leavitt took Jahanna to Dr.
    Burba's office, where she was diagnosed with a "hip click."      She
    6
    was given a hip ultrasound, which was normal.     On September 29,
    2009, Leavitt reported that Jahanna had again vomited blood, and
    returned to the Winchester Hospital emergency room, where she
    was given an abdominal x-ray, which was normal, and once again
    was prescribed the antacid medication.    At her six-month "well-
    visit" on October 2, Jahanna was "no longer fussy or irritable,"
    and her "gross motor development examination," which showed that
    she could roll over from side to side, move objects from one
    hand to another, and sit up with a bit of support, was normal
    for her age.   During her care of Jahanna, Dr. Burba saw no sign
    that Jahanna had been abused.
    On October 20, 2009, Leavitt was at work and the defendant
    was alone in her Woburn apartment caring for the twins.    At
    approximately 8:45 P.M., Robert Jeffrey, who lived next door
    with his wife, Eileen, knocked on the door to Leavitt's
    apartment, which was slightly ajar, and asked the defendant for
    a cigarette.   He saw the defendant sitting on the couch in the
    living room feeding Jahanna, with Taeja sitting in "a little
    bouncy thing" on the floor.     Their demeanor appeared "good";
    Jahanna "was just whining like she was hungry."    The defendant
    said he did not have any cigarettes, so Robert3 drove to a nearby
    gasoline station, approximately four minutes away.    When Robert
    3
    We refer to Robert Jeffrey and Eileen Jeffrey by their
    first names because they share the same last name.
    7
    parked in front of his apartment, about ten minutes later, the
    defendant ran over, looking "[v]ery shooken up," and asked to
    use Robert's telephone to call his girl friend because something
    had happened to one of the babies.    Eileen, who was a certified
    nurse assistant, was walking towards Robert from the steps of
    the Jeffrey home when Robert returned.    She heard the defendant
    say that the baby fell, and when Eileen asked if she was okay,
    the defendant said he did not know.   She then immediately walked
    into the defendant's apartment and saw Jahanna on the couch.
    Jahanna was pale and unresponsive, and her eyes were closed.
    Robert then drove the defendant and Jahanna to the emergency
    room at Winchester Hospital.
    At trial, Eileen testified that she was sitting at her
    computer on the first floor of her apartment when Robert left to
    find cigarettes, and she went outside when she heard him
    returning.   Although the walls between her apartment and the
    Leavitt apartment were thin, and she could often hear noises
    coming from the Leavitt apartment, Eileen heard no banging or
    other noise during the time that Robert was gone.
    Jahanna arrived in the emergency room of Winchester
    Hospital at approximately 9:18 P.M.   Dr. Atima Delaney, the
    attending pediatric physician in the emergency room who treated
    Jahanna, obtained a medical history of Jahanna from the
    defendant that evening.   Dr. Delaney described the defendant as
    8
    "worried and quiet."    The defendant told Dr. Delaney that he had
    been sitting on the couch while Jahanna had been lying on the
    couch.    When he turned around to grab a bottle, Jahanna fell off
    the couch.    When he turned back, he saw the baby lying on her
    back on the hardwood floor.    She immediately vomited, and then
    became unconscious.
    A computerized tomography (CT) scan taken at Winchester
    Hospital revealed a large subdural hematoma (a collection of
    blood between the dura4 and the brain), brain swelling, and a
    comminuted skull fracture located in the left parietal skull.5
    The CT scan also showed a "midline shift," meaning that one side
    of the brain had started to push over to the other side because
    of the brain swelling.    Because of the severity of Jahanna's
    injuries, she was transferred to Children's Hospital, where a
    pediatric neurosurgeon, Dr. Mark Proctor, performed emergency
    brain surgery.    When he opened the dura inside the skull to
    relieve the brain swelling, the fluid, including clotted blood,
    was under such high pressure that it "squirted up about one and
    a half to two feet."    The presence of clotted blood revealed
    that the injury had happened "within hours."    Dr. Proctor did
    4
    The dura is the membrane between the skull and the brain.
    5
    A fracture is characterized as comminuted where there is a
    series of fractures that cross or are parallel rather than a
    single fracture in one straight line, which is characterized as
    linear.
    9
    not see extensive injury to the brain itself, but saw that the
    brain was swelling to such an extent that he needed to remove
    more bone to relieve the pressure.    He located the torn blood
    vessel that was the cause of the hemorrhage, which was in the
    subdural space towards the top of the head, to the left of the
    midline.
    On the afternoon of October 21, Inspector Timothy Donovan
    of the Woburn police department interviewed the defendant at
    Children's Hospital.   The defendant recounted essentially what
    he had told Dr. Delaney, but with some additional details.    He
    said he was sitting in the middle of a two-seat loveseat,
    watching a baseball game on the television, and was preparing to
    feed Jahanna.   He placed her to his right on the loveseat,
    facing the back of the couch.   He reached back to grab a bottle
    and saw Jahanna fall off the couch.    When he picked her up from
    the floor, her eyelids were closed, she was not crying, and her
    head was "bobbling."   He saw that she was breathing, but
    unresponsive, so he took off her pajamas, brought her upstairs
    to the bathroom, placed her in her "bathinet," and sprinkled
    water on her face.   When he saw that she was still unresponsive,
    he put her pajamas back on, and ran next door to speak to the
    Jeffreys.   When the inspector told him that Jahanna's injuries
    were consistent with her having been shaken, the defendant
    replied that the only shaking he ever did was bouncing Jahanna
    10
    on his knee.   The inspector later measured the distance from the
    floor to the seat of the couch and determined that it was
    seventeen and one-half inches tall.
    The defendant spoke that same day with Donna Hughes, an
    investigator with the Department of Children and Families, and
    told her essentially what he had told Dr. Delaney and Inspector
    Donovan, but with one important additional detail:    he said
    that, when Jahanna fell, she fell backwards and her head hit the
    floor.
    An examination by a pediatric ophthalmologist, Dr. Iason
    Mantagos, on October 22 found no sign of direct trauma to the
    eyes.    But he found in both eyes extensive hemorrhages (blood
    spots) in all four quadrants of the retina (the multiple layers
    of cells that include the photo receptors that are stimulated by
    light and create impulses that are sent to the brain), from the
    center to the periphery of the retina, including on the optic
    nerve (which sends information from the retina to the brain) and
    in the macular (the area of the eye responsible for sharpest
    vision).   Dr. Mantagos testified that "[t]his finding is
    consistent with trauma and the force that's required to cause
    such bleeding is extensive."    In describing the different kinds
    of trauma that can produce retinal hemorrhages, he included the
    extreme shaking of an infant, which causes the contents of the
    eyeball to move rapidly back and forth at different speeds,
    11
    which in turn causes the vitrious (the jelly that fills the eye)
    to separate from the retina and put traction on the blood
    vessels.6   Claiming reliance on the medical literature in peer-
    reviewed journals, he opined on redirect examination that the
    retinal hemorrhaging he found would be consistent with a fall
    only if it were from the highest point of a swing to a cement
    floor, a fall down a flight of stairs in a stroller, or a fall
    from a height of one or two stories and hitting the ground.
    Dr. Alice Newton was the medical director of the Child
    Protection Program at Children's Hospital, and has written
    extensively on shaken baby syndrome, which she testified was now
    called abusive head trauma.7   She examined Jahanna on October 21
    6
    Dr. Iason Mantagos also testified that the shaking of an
    infant can cause bleeding inside the skull, swelling of the
    brain, and fractures of the vertebrae where the skull meets the
    spinal cord.
    7
    In 2009, the American Academy of Pediatrics (AAP) in a
    policy statement recommended that pediatricians "use the term
    'abusive head trauma' rather than a term that implies a single
    injury mechanism, such as shaken baby syndrome, in their
    diagnosis and medical communications." Christian, Block, and
    the Committee on Child Abuse and Neglect, Abusive Head Trauma in
    Infants and Children, 123 Pediatrics 1409, 1411 (2009). The AAP
    explained, "The goals of this policy statement is not to detract
    from shaking as a mechanism of [abusive head trauma] but to
    broaden the terminology to account for the multitude of primary
    and secondary injuries that result from [abusive head trauma],
    some of which contribute to the often-permanent and significant
    brain damage suffered by abused infants and children." Id. at
    1410. It noted that the term "shaken baby syndrome" is
    "sometimes used inaccurately to describe infants with impact
    injury alone or with multiple mechanisms of head and brain
    12
    to determine whether Jahanna's injuries were caused by child
    abuse.   Dr. Newton testified that, "when one refers to shaken
    baby syndrome, one refers to a combination of findings":
    bleeding around the brain (subdural hematoma), brain injury, and
    retinal hemorrhages.8   She testified that Jahanna displayed all
    three of these injuries, and she described how shaking can cause
    each of them.   She opined to a "reasonable degree of medical
    certainty" that the cause of Jahanna's subdural hematoma, brain
    injury, and retinal hemorrhages was that Jahanna was "violently
    shaken."   She stated as the basis of her opinion that the
    constellation of injuries sustained by Jahanna fit the
    definition of shaken baby syndrome and "do not have any other
    medical explanation."   She declared that Jahanna "did not have
    some type of massive accidental head injury" and that "the
    amount of force in a short household fall is not very
    significant."   Dr. Newton also offered a motive for violently
    shaking a baby, explaining that when a caretaker is unable to
    handle a crying infant, he or she sometimes shakes the infant as
    a mode of discipline or simply out of frustration.
    injury and focuses on a specific mechanism of injury rather than
    the abusive event that was perpetrated against a helpless
    victim." Id.
    8
    Dr. Alice Newton noted that it is not always true that the
    violent shaking of an infant results in all three of the
    constellation of injuries.
    13
    She further testified that in addition to the brain
    bleeding, brain injuries, and retinal hemorrhages, Jahanna was
    diagnosed with fractures of multiple ribs and of the tibia of
    her right leg, both of which were in an advanced state of
    healing and were "probably at least a month old."    Dr. Newton
    also noted that Jahanna had compression fractures of thoracic
    vertebrae eleven and twelve.    She said she could not opine when
    the vertebral fractures occurred, because they do not heal with
    new bone formation like ribs and the tibia, but she did offer
    the opinion that these fractures were caused by "some type of
    crushing force," which could include the extreme flexion caused
    by violent shaking.
    Dr. Newton opined to a reasonable degree of medical
    certainty that, of all the injuries suffered by Jahanna, "the
    only injury . . . that could possibly be related" to a short
    fall was the skull fracture, but that this was "very unlikely,"
    because short falls are more likely to result in linear, rather
    than comminuted, fractures.    She testified that the skull
    fracture required "some type of blow," such as "slamming the
    child against something."9    She stated that one could not
    determine when a skull fracture occurred simply by looking at
    9
    Dr. Newton noted that it is "common" that the violent
    shaking of an infant is followed by the angry caretaker throwing
    the infant on the floor, resulting in swelling of the scalp or
    some type of fracture.
    14
    the CT scan because it heals in the same way that vertebrae
    heal, but she felt strongly that the skull fracture was "acute,
    although that's a little bit harder to be definitive about."
    The defendant called three witnesses in his defense:      his
    sister, his mother, and himself.   His sister testified that she
    never saw the defendant shake, spank, or throw Jahanna, and
    never saw him compress Jahanna's ribs.     His mother said little
    regarding the defendant's care of the twins because, when the
    twins were at her house, she or the defendant's sister would
    feed and change them, not the defendant.    The defendant's
    testimony was essentially consistent with what he had already
    told Dr. Delaney and the investigators.     The defendant offered
    no expert witness to rebut the medical opinion evidence
    regarding shaken baby syndrome.
    The prosecutor in closing argument argued that the
    defendant "shook [Jahanna] with such violence it caused the
    blood vessels in her brain to hemorrhage.     It caused the [blood
    vessels in her] retinas in the back of her eyes . . . to
    hemorrhage in an attempt to get her to stop crying so he could
    focus on the game that he so wanted to watch. . . .     He collided
    her head against a blunt object or surface to cause that
    multiple fracture in her skull, and shook her with such force
    that T11 and T12 vertebrae were fractured in a compressive
    manner consistent with her shaking back and forth with her spine
    15
    moving back and forth in a rapid acceleration and deceleration
    fashion."    The prosecutor also argued that "[i]t does not make
    sense" that Jahanna's fall from the couch could have caused her
    extensive brain bleeding and swelling, or her comminuted skull
    fractures.   He claimed that "[c]hildren fall all the time" and
    "[t]heir heads collide with hard objects or floors," but "[t]hey
    do not go unresponsive" or sustain the injuries found here.
    The defense attorney in closing argument focused almost
    entirely on the multiple persons who cared for Jahanna before
    October 20, and invited the jury to consider that any one of
    them could have been responsible for the fractures to her ribs
    and tibia that occurred before that date.   As to the head
    injuries suffered on October 20, he said that it was an
    "accident that can happen with any one of us who may be taking
    care of children."
    The defendant's strategy of focusing the jury on the number
    of Jahanna's caretakers was successful in obtaining acquittals
    on the two indictments charging the defendant with causing
    Jahanna's fractured tibia and fractured ribs, both of which
    showed signs of healing before October 20 and therefore occurred
    before that date.    But the jury found the defendant guilty on
    the indictments alleging that the defendant caused Jahanna's
    16
    head and vertebral injuries on the theory of intentional assault
    and battery.10
    2.    Motion for new trial.   The defendant filed a motion for
    a new trial under Mass. R. Crim. P. 30 (b), as appearing in 
    435 Mass. 1501
     (2001), on grounds of ineffective assistance of
    counsel.    The defendant claimed that trial counsel was
    ineffective for failing to consult or call an expert on the
    science of shaken baby syndrome, and that his counsel's failure
    to do so denied him a substantial ground of defense.       The trial
    judge held an evidentiary hearing on the motion.
    At the hearing, where the defendant was represented by new
    counsel, the defendant presented an affidavit from his trial
    attorney.11   Trial counsel attested that the defendant was
    indigent but he was retained privately by the defendant's
    father.    He sought funds from the defendant's father to retain
    an expert, but the father refused to pay, so he did not consult
    with any medical expert or present any expert testimony.
    10
    The defendant was sentenced to not less than four and not
    more than five years in State prison on the indictment charging
    assault and battery on a child causing substantial bodily injury
    (head injuries), followed by a five-year term of probation on
    the indictment charging assault and battery on a child causing
    bodily injury (fractured vertebrae).
    11
    Although the affidavit was not formally admitted in
    evidence, it was informally admitted in that the defendant
    submitted the affidavit at the hearing, the judge suggested that
    she would consider it, and the Commonwealth did not object.
    17
    Instead, he reviewed the studies Dr. Newton cited in her
    testimony and the medical literature on shaken baby syndrome.
    At the hearing, the defense offered the judge a glimpse of
    the scientific evidence that could have been presented at trial
    through the testimony of Dr. Ronald Uscinski, a board-certified
    clinical neurosurgeon.    Dr. Uscinski testified to opinions that
    challenged the opinions of the Commonwealth's experts who
    testified at trial and offered an alternative scientific
    explanation for Jahanna's injuries consistent with an accidental
    fall.
    First, Dr. Uscinski called into question whether shaken
    baby syndrome is a valid and scientifically supported medical
    diagnosis.   He testified to the weaknesses of the methodologies
    employed by many of the foundational shaken baby syndrome
    studies, and stated that numerous studies have shown that humans
    cannot shake babies hard enough to cause bleeding in the
    subdural space.   He explained that no one knows the minimum
    force required to cause subdural bleeding in a baby, but it is
    known that "[t]here's a range, and we don't come anywhere near
    that range by shaking."   He pointed to research showing that if
    an infant were shaken so violently to produce the level of force
    needed to cause the triad of symptoms of shaken baby syndrome,
    the infant's neck would not be able to withstand the force and
    would suffer some sort of injury.   He concluded that shaken baby
    18
    syndrome is a hypothesis that has "never been proved" and is
    "scientifically . . . not plausible."    He also opined to a
    reasonable degree of medical certainty that shaking an infant
    cannot cause the "triad of injuries" associated with shaken baby
    syndrome (subdural hematoma, brain swelling, and retinal
    hemorrhages).
    Second, Dr. Uscinski put forth an alternative theory of the
    cause of Jahanna's injuries.    Dr. Uscinski opined to a
    reasonable degree of medical certainty that a skull fracture of
    the type Jahanna sustained can be caused by a fall of seventeen
    and one-half inches onto a hard surface.   He explained that a
    fracture can result from an impact in another area of the head,
    caused by one part of the bone being pushed in and other parts
    of the bone being pushed outward.   He explained that the
    parietal bone is "quite thin in [the area of compression] and
    will be susceptible to being cracked if bent that way, and that
    resulted in that parietal fracture."    He also stated that the
    impact from the fall could have caused the tearing of the blood
    vessels and the development of subdural bleeding.   The subdural
    bleeding could then have caused elevated intracranial pressure,
    the presence of which was evident from the increased retinal
    venous pressure shown on Jahanna's CT scan.    In his opinion,
    this elevated intracranial pressure in turn caused the retinal
    hemorrhages.    Based on this scientific theory, Dr. Uscinski
    19
    testified that a short fall of seventeen and one-half inches
    onto a hard surface could account for the head injuries that
    Jahanna sustained.
    The Commonwealth again called Drs. Mantagos and Newton to
    testify at the hearing.    Dr. Mantagos testified that retinal
    hemorrhages can result from elevated intracranial pressure, but
    such hemorrhages "tend to be isolated in number[]."    In
    contrast, where caused by abusive head trauma, the retinal
    hemorrhaging tends to be more extensive, to involve more layers
    of the retina, and to be present in all four quadrants of the
    retina.   He testified that the retinal hemorrhaging in Jahanna's
    right eye was extensive, was in at least two layers of the
    retina, and was in all four quadrants, and that the retinal
    hemorrhaging in her left eye was "less extensive . . . but still
    a significant number."    He opined that he "would not expect"
    intracranial pressure to be the cause of the retinal
    hemorrhaging in both eyes.
    Dr. Mantagos admitted that retinal hemorrhages can occur
    even with short falls, but stated that they "tend to be" rare,
    associated with bleeding in the brain, and isolated in one eye.
    Dr. Mantagos stated that "the hemorrhages that we see here
    involve both eyes and they're more in number than you would
    expect to see from falls."   He opined that he "would not expect"
    20
    a short fall of seventeen and one-half inches to be the cause of
    the retinal hemorrhages.
    Dr. Newton reiterated the opinion she gave at trial that
    the only cause consistent with Jahanna's injuries was the
    intentional infliction of injury by her caretaker.   But her
    testimony at the motion hearing differed from her trial
    testimony in that, at trial, Dr. Newton had opined that
    Jahanna's brain injuries and retinal hemorrhaging were caused by
    shaking alone, but she testified at the motion hearing that the
    cause of these injuries was shaking combined with a slamming
    against a hard surface.    She opined that it is "very, very
    unlikely" that Jahanna's comminuted skull fracture, which was
    located on the left side of her skull, could have resulted from
    a fall onto the back of her head.    Rather, she testified that
    the amount of swelling and the collection of blood around the
    fracture signify that Jahanna had a blow to the left side of her
    head.   She rejected Dr. Uscinski's opinion that Jahanna's head
    injuries were consistent with an accidental fall as described by
    the defendant.
    The judge concluded that trial counsel's failure to consult
    with an expert to attempt to counter the opinions of the
    Commonwealth's experts, explore an alternative theory of
    causation, and assist him in cross-examination fell below the
    minimum level of performance expected from an ordinary, fallible
    21
    criminal defense attorney, because it ceded the "pivotal issue"
    of causation and left the defendant "without an opportunity for
    a viable defense."   She determined that trial counsel "should
    have sought the necessary funds to hire an expert to examine the
    medical records in order to explore whether Jahanna could have
    sustained her injuries from falling from . . . a couch."   But
    the judge denied the defendant's motion for a new trial because
    she concluded that, "due to the powerful medical evidence that
    was before the jury, it is unlikely that an expert's assistance
    or opinion would have 'accomplished something material for the
    defense'" (citation omitted).    In short, the judge determined
    that the Commonwealth's experts had so overwhelmingly
    established that Jahanna's injuries were intentionally inflicted
    that "it cannot be reasonably asserted that Jahanna sustained
    [the injuries] by merely falling off of a couch onto the back of
    her head," so neither better cross-examination nor an expert's
    opinion would have "added anything substantial to the defense."
    The defendant appealed from his convictions and from the
    denial of his motion for a new trial, and we granted the
    defendant's motion for direct appellate review.    The defendant
    presents two claims on appeal.   First, he contends that the
    judge erred in denying his motion for a new trial.    Second, he
    contends that the evidence was insufficient as a matter of law
    to support his conviction on the indictment charging assault and
    22
    battery of a child causing bodily injury (fractured vertebrae)
    because no reasonable jury could ascertain when these fractures
    occurred and that he had caused them.
    Discussion.   1.   Motion for new trial.   As we consider
    "whether there has been a significant error of law or other
    abuse of discretion" in the denial of the motion for a new
    trial, Commonwealth v. Grace, 
    397 Mass. 303
    , 307 (1986), it is
    important to recognize that the Commonwealth's case rested
    almost entirely on inferences regarding the defendant's conduct
    based on the medical evidence.   There was no evidence that the
    defendant had ever before shaken, spanked, or struck Jahanna; at
    worst, he was inexperienced in caring for an infant and, at
    times, burped her a bit too hard and left her without adequate
    vigilance when she was being changed.   On October 20, within ten
    minutes of when Jahanna was found unconscious and unresponsive,
    Robert Jeffrey saw the defendant feeding her on the living room
    sofa.   During those ten minutes, despite the thin walls that
    separated their neighboring apartments, Eileen Jeffrey heard
    nothing unusual.   The Commonwealth's theory of the case at trial
    was that, at some moment within those ten minutes, the defendant
    became so enraged at Jahanna that he shook her so violently that
    he caused her to suffer the triad of symptoms of shaken baby
    syndrome.
    23
    Essentially, the Commonwealth's prosecution rested on two
    related claims:   first, that the only medically reasonable
    explanation for the nature and severity of Jahanna's injuries
    was that she was violently shaken by the defendant; and second,
    that injuries of the nature and severity she suffered could not
    possibly have been caused by an accidental fall from a sofa, so
    the defendant was lying when he offered that explanation,
    demonstrating his consciousness of guilt.   A competent defense
    attorney would have recognized that, if the jury were to find
    that the defendant's report of an accidental fall was credible
    and that medically it was reasonably possible that Jahanna's
    injuries were caused by that fall, the jury might have a
    reasonable doubt whether the defendant violently shook Jahanna.
    Therefore, it was critically important to the defendant to
    elicit evidence, whether through cross-examination of the
    prosecution's expert, the testimony of a defense expert, or
    both, that may cause the jury to have a reasonable doubt whether
    Jahanna's injuries could have been caused by the accidental fall
    described by the defendant.
    To prevail on a motion for a new trial claiming ineffective
    assistance of counsel, a defendant must show that there has been
    a "serious incompetency, inefficiency, or inattention of counsel
    -- behavior of counsel falling measurably below that which might
    be expected from an ordinary fallible lawyer," and that
    24
    counsel's poor performance "likely deprived the defendant of an
    otherwise available, substantial ground of defence."
    Commonwealth v. Saferian, 
    366 Mass. 89
    , 96 (1974).      We agree
    with the judge that the first prong of the Saferian test was met
    in this case.
    The defendant's trial counsel here was ineffective, not
    because he failed to understand that he needed an expert witness
    to advise him regarding the medical evidence and to offer
    opinion testimony, but because he failed to seek funds from the
    court to retain an expert witness for his indigent client.     A
    defendant who is indigent is entitled to funds for an expert
    witness where the retention of such a witness is necessary to
    the defense even where the defendant's family member is paying
    the defendant's legal fees.   See G. L. c. 261, § 27C
    (Commonwealth shall provide funds to cover "extra fees and
    costs" for indigent defendant if "the document, service or
    object is reasonably necessary to assure the applicant as
    effective a . . . defense . . . as he would have if he were
    financially able to pay").    Where, as here, the defendant was
    indigent and the family member who was otherwise furnishing
    funds for the defense refused to pay for an expert witness, it
    was manifestly unreasonable for defense counsel not to apply to
    the judge for the funds needed to retain an expert witness.        See
    Hinton v. Alabama, 
    134 S. Ct. 1081
    , 1088 (2014) ("The trial
    25
    attorney's failure to request additional funding in order to
    replace an expert he knew to be inadequate because he mistakenly
    believed that he had received all he could get under Alabama law
    constituted deficient performance"); Commonwealth v. Kolenovic,
    
    471 Mass. 664
    , 674 (2015), quoting Commonwealth v. Acevedo, 
    446 Mass. 435
    , 442 (2006) (where defendant's ineffective assistance
    of counsel claim "is based on a tactical or strategic decision,
    the test is whether the decision was '"manifestly unreasonable"
    when made'").   See also Commonwealth v. Haggerty, 
    400 Mass. 437
    ,
    442 (1987) ("Failure to investigate the only defense a defendant
    has, if facts known to or with minimal diligence accessible to
    counsel support that defense, falls beneath the level of
    competency expected").
    Turning to the second prong of the Saferian test, we
    consider whether counsel's failure to seek funds to retain an
    expert witness prejudiced the defendant.   Prejudice in this
    context means that the defendant has likely been deprived of an
    "available, substantial ground of defence," Saferian, supra at
    96; the challenge is to articulate when a defense is substantial
    such that its deprivation requires a new trial.
    Ten years after we established the Saferian test to
    determine when a defendant is entitled to a new trial because of
    the ineffectiveness of counsel, the United States Supreme Court
    established its own test under Federal constitutional law.
    26
    Strickland v. Washington, 
    466 U.S. 668
    , 693-694 (1984).    The
    Court held that, where counsel has been ineffective, the
    defendant must "affirmatively prove prejudice."   
    Id. at 693
    .    In
    order to prove prejudice,
    "[t]he defendant must show that there is a reasonable
    probability that, but for counsel's unprofessional errors,
    the result of the proceeding would have been different. A
    reasonable probability is a probability sufficient to
    undermine confidence in the outcome."
    
    Id. at 694
    .   We have not adopted this precise formulation but
    have recognized that the prejudice standard under the
    Massachusetts Constitution "is at least as favorable to a
    defendant as is the Federal standard."   Commonwealth v. Curtis,
    
    417 Mass. 619
    , 624 n.4 (1994).
    In reviewing convictions in noncapital cases such as this,
    we have sometimes said that, for a new trial to be ordered
    because of counsel's inadequate performance, "there ought to be
    some showing that better work might have accomplished something
    material for the defense."   Commonwealth v. Satterfield, 
    373 Mass. 109
    , 115 (1977).   This phrase from Satterfield has often
    been cited as the prejudice standard where counsel failed to
    investigate or present a ground of defense.   See, e.g.,
    Commonwealth v. Valentin, 
    470 Mass. 186
    , 190 (2014) (citing
    Satterfield and explaining that its statement that "better work
    might have accomplished something material for the defence" is
    standard for Saferian requirement that counsel's ineffectiveness
    27
    must have deprived defendant of "available, substantial ground
    of defence" [citations omitted]); Commonwealth v. Marinho, 
    464 Mass. 115
    , 129 (2013) (same); Commonwealth v. Dargon, 
    457 Mass. 387
    , 403 (2010) (same); Commonwealth v. Urena, 
    417 Mass. 692
    ,
    701 (1994) (same).   But, when viewed in the context of the
    opinion in Satterfield, the words that have subsequently been
    described as a prejudice standard appear to be simply a minimum
    threshold for a showing of prejudice, which in that case the
    defendant failed to meet.   See Satterfield, supra.12
    In other cases, we have drawn parallels between the second
    prong of the Saferian test and the standard that applies where a
    claimed error that defense counsel failed adequately to
    12
    In reviewing convictions of murder in the first degree,
    where we determine pursuant to G. L. c. 278, § 33E, whether
    there has been a substantial likelihood of a miscarriage of
    justice, we have declared that "a new trial is called for unless
    we are substantially confident that, if the error had not been
    made, the jury verdict would have been the same." Commonwealth
    v. Alcide, 
    472 Mass. 150
    , 157 (2015), quoting Commonwealth v.
    Spray, 
    467 Mass. 456
    , 472 (2014). We have also said that a new
    trial is required where the error "was likely to have influenced
    the jury's conclusion." Commonwealth v. Gonzalez, 
    473 Mass. 415
    , 421 (2015), quoting Commonwealth v. Wright, 
    411 Mass. 678
    ,
    682 (1992), S.C., 
    469 Mass. 447
     (2014). If we were to apply the
    language in Commonwealth v. Satterfield, 
    373 Mass. 109
    , 115
    (1977) -- "better work might have accomplished something
    material for the defense" -- as a prejudice standard, it would
    appear to be more favorable to defendants than the Alcide or
    Gonzalez standard under § 33E, which would be inconsistent with
    our view that the substantial likelihood of a miscarriage of
    justice standard applied to § 33E cases is more favorable to a
    defendant than the substantial risk of a miscarriage of justice
    standard applied to noncapital cases. See Wright, 
    supra at 681
    .
    28
    challenge at trial is raised for the first time on appeal or in
    a postappeal motion for a new trial.   See Commonwealth v. Azar,
    
    435 Mass. 675
    , 685 (2002), S.C., 
    444 Mass. 72
     (2005);
    Commonwealth v. LeFave, 
    430 Mass. 169
    , 173-174 (1999).   In those
    cases, we have said that the defendant is entitled to a new
    trial if there is a substantial risk of a miscarriage of justice
    arising from counsel's failure. See Azar, supra; LeFave, supra.
    See also Commonwealth v. Robideau, 
    464 Mass. 699
    , 705 (2013).
    Under that standard, a defendant is entitled to a new trial "if
    we have a serious doubt whether the result of the trial might
    have been different had the error not been made."   Azar, supra,
    quoting LeFave, supra at 174.   We now declare that this standard
    is effectively the same as the prejudice standard under the
    second prong of Saferian:   where counsel was ineffective for
    failing to present an available ground of defense, that defense
    is "substantial" for Saferian purposes where we have a serious
    doubt whether the jury verdict would have been the same had the
    defense been presented.13   The defendant need not prove that he
    13
    We recognize that the language we adopt for the prejudice
    standard under the second prong of the test in Commonwealth v.
    Saferian, 
    366 Mass. 89
    , 96 (1974) -- "we have a serious doubt
    whether the jury verdict would have been the same had the
    defense been presented" -- differs slightly from the language of
    the substantial risk of a miscarriage of justice standard that
    we used in Commonwealth v. Azar, 
    435 Mass. 675
    , 685 (2002),
    quoting Commonwealth v. LeFave, 
    430 Mass. 169
    , 174 (1999) ("we
    have a serious doubt whether the result of the trial might have
    29
    or she would have been found not guilty if defense counsel had
    presented the jury with this ground of defense. See Strickland,
    
    466 U.S. at 693
     ("a defendant need not show that counsel's
    deficient conduct more likely than not altered the outcome in
    the case").
    We conclude that the judge erred in finding that counsel's
    ineffectiveness did not prejudice the defendant.   The judge
    recognized that Dr. Uscinski challenged the proposition that the
    force produced by shaking a baby alone could have caused
    Jahanna's head injuries, but determined that this opinion did
    not relate to this case because "there was evidence that Jahanna
    was not only shaken but suffered some sort of impact trauma as
    well."   At trial, however, as earlier noted, Dr. Newton offered
    the opinion that the cause of Jahanna's triad of head injuries
    was that she was "violently shaken."   She did not claim the
    skull fracture to be a contributing cause of these injuries
    until she testified at the hearing on the motion for a new
    trial.   Therefore, had Dr. Uscinski's expert testimony been
    been different had the error not been made"). We believe the
    standards are identical in their application; we have revised
    the language only because we think it more clear.
    30
    offered at trial, the defendant could have challenged Dr.
    Newton's opinion as to the cause of Jahanna's head injuries.14
    Nor can we say with confidence that such a challenge to Dr.
    Newton's opinion that violent shaking caused Jahanna's head
    injuries would not have been persuasive.   An expert witness
    testifying at trial in October, 2010, once his or her opinion
    was challenged on cross-examination, on redirect examination
    could have cited to numerous scientific studies supporting the
    view that shaking alone cannot produce injuries of the type and
    severity suffered by Jahanna.15   Indeed, Dr. Newton herself
    14
    Dr. Mantagos was a treating physician and did not offer
    an opinion as to the cause of Jahanna's retinal hemorrhaging,
    but the reasonable takeaway from his testimony was that it was
    caused by extreme shaking. Dr. Uscinski's expert testimony
    would also have challenged this apparent conclusion.
    15
    See, e.g., Bandak, Shaken Baby Syndrome: A Biomechanics
    Analysis of Injury Mechanisms, 151 Forensic Sci. Int'l 71, 78
    (2005) (infant shaking cannot cause serious injuries without
    also resulting in neck injury); Ommaya, Goldsmith, & Thibault,
    Biomechanics and Neuropathology of Adult and Pediatric Head
    Injury, 16(3) Brit. J. of Neurosurgery 220, 233 (2002) (based on
    standard biomechanical principles, shaken baby syndrome
    hypothesis requires forces that are biomechanically improbable
    and increased intracranial pressure is more likely to cause
    retinal bleeding than shaking); Duhaime, Gennarelli, Thibault,
    Bruce, Margulies, & Wiser, The Shaken Baby Syndrome: A
    Clinical, Pathological, and Biomechanical Study, 66 J.
    Neurosurgery 409, 413-414 (1987) (subjecting biomechanical model
    to repetitive violent shaking demonstrated that shaking fell
    below established injury thresholds). See also Cavazos v.
    Smith, 
    132 S. Ct. 2
    , 10 (2011) (Ginsburg, J., dissenting),
    quoting State v. Edmunds, 
    308 Wis. 2d 374
    , 386 (2008), and
    sources cited ("Doubt has increased in the medical community
    31
    appears to have changed her opinion that shaking alone caused
    Jahanna's triad of head injuries.
    If a defense expert had caused the jury to doubt whether
    violent shaking alone could have caused Jahanna's severe
    injuries, they may have asked whether there was any
    corroborative evidence that Jahanna was slammed against the wall
    or thrown to the floor.    But Eileen Jeffrey heard nothing
    unusual during the ten minutes her husband was gone, even though
    the walls between the apartment were thin and sounds could often
    be heard from next door.   And if the jury had determined that
    Jahanna's injuries could not have happened without impact
    trauma, they might have considered more carefully whether the
    impact trauma described by the defendant -- Jahanna's head-first
    fall from the sofa onto the wooden floor -- could have sufficed
    to cause her head injuries.
    If they had done so, it is likely that the opinion
    testimony of such a defense expert would have influenced the
    jury's evaluation of whether the Commonwealth had eliminated the
    'over whether infants can be fatally injured through shaking
    alone'").
    A more recent study would also support this proposition.
    See generally Jones, Martin, Williams, Kemp, & Theobald,
    Development of a Computational Biomechanical Infant Model for
    the Investigation of Infant Head Injury by Shaking, 55 Med.,
    Sci., & Law 291 (2015) (biomechanical study using computational
    model suggests shaking cannot generate levels of force necessary
    to produce injuries associated with abusive head trauma).
    32
    possibility that Jahanna's injuries were caused by the
    accidental fall described by the defendant beyond a reasonable
    doubt, such that we have a serious doubt whether the jury's
    verdict would have been the same.   See Commonwealth v. LaBrie,
    
    473 Mass. 754
    , 772-774 (2016) (counsel's failure to consult with
    independent oncologist likely deprived defendant of substantial
    ground of defense on key issue in case -- whether defendant
    intended to kill her child by failing to give him prescribed
    medication).   The judge erred in finding that Dr. Uscinski
    "failed to address the severity of Jahanna's injuries."    The
    judge determined that, although Dr. Uscinski testified that it
    was possible to sustain head injuries from an accidental short
    fall, he "did not mention whether a fall from such a short
    distance could cause the extent of the skull fractures and brain
    hemorrhaging that Jahanna suffered."   Dr. Uscinski, however,
    stated unequivocally in his testimony that a short fall from
    seventeen and one-half inches "could account for" the head
    injuries that Jahanna sustained.    Dr. Uscinski also explained in
    detail why Jahanna's comminuted skull fracture could have been
    caused by a fall of only seventeen and one-half inches.
    Specifically, he stated that "a fracture of this nature can be
    sustained from a fall of that distance."
    Moreover, an expert witness testifying at trial in October,
    2010, could have cited to numerous scientific studies in support
    33
    of an opinion that accidental short falls can produce injuries
    of the nature and severity suffered by Jahanna.16   Such opinion
    16
    See, e.g., Roth, Raul, Ludes, & Willinger, Finite Element
    Analysis of Impact and Shaking Inflicted to a Child, 121 Int'l
    J. Legal Med. 223, 225 (2007) (based on computer simulation,
    eighteen inch fall as likely to cause subdural hemorrhage as
    shaking); Prange, Coats, Duhaime, & Margulies, Anthropomorphic
    Simulations of Falls, Shakes, and Inflicted Impacts in Infants,
    99 J. Neurosurgery 143 (2003) (shaking and minor falls produce
    similar rotational responses, with falls of only twelve inches
    with head impact producing accelerations in excess of those
    produced during shaking); Hymel, Jenny, & Block, Intracranial
    Hemorrhage and Rebleeding in Suspected Victims of Abusive Head
    Trauma: Addressing the Forensic Controversies, 7 Child
    Maltreatment 329 (2002)(describing two cases of serious head
    trauma from accidental short falls); Jenny, Shams, Rangarajan, &
    Fukuda, Development of a Biofidelic 2.5 kg Infant Dummy and Its
    Application to Assessing Infant Head Trauma During Violent
    Shaking, Injury Biomechanics Research, Proceedings of the
    Thirtieth International Workshop, at 138 (Nov. 10, 2002) (based
    on biomechanical experiment, maximum head center of gravity
    acceleration produced by shaking less than one-third of that
    produced by rolling off sofa); Plunkett, Fatal Pediatric Head
    Injuries Caused by Short-Distance Falls, 22 Am. J. Forensic Med.
    & Pathology 1, 7-9 (2001) (symptoms attributed to shaken baby
    syndrome also found in fatal short falls); Christian, Taylor,
    Hertle, & Duhaime, Retinal Hemorrhages Caused by Accidental
    Household Trauma, 135 J. Pediatrics 125, 127 (1999) (reporting
    three cases of infants between seven months and thirteen months
    of age who had retinal hemorrhages after short falls); Hall,
    Reyes, Horvat, Meller, & Stein, The Mortality of Childhood
    Falls, 29 J. Trauma 1273-74 (1989) (of fatal falls by children
    in Cook County, Illinois, during four-year period, forty-one per
    cent were minor falls from less than three feet).
    More scientific support for this proposition will be
    available at a new trial. See Barnes, Imaging of Nonaccidental
    Injury and the Mimics: Issues and Controversies in the Era of
    Evidence-Based Medicine, 49 Radiologic Clinics of N. Am. 205,
    217 (2011) (based on clinical, biomechanical, neuropathological,
    and neuro-radiological evidence, significant head injury,
    including subdural and retinal hemorrhages, may result from low
    level falls); Squier, The "Shaken Baby" Syndrome: Pathology and
    34
    testimony would likely have caused a reasonable jury carefully
    to consider whether they were certain beyond a reasonable doubt
    that Jahanna's head injuries were not caused by the accidental
    fall described by the defendant.   At the hearing on the motion
    for a new trial, Dr. Mantagos said that he "would not expect"
    that Jahanna's retinal hemorrhages could have been caused by a
    fall of seventeen and one-half inches, and Dr. Newton testified
    that it was "very, very unlikely" that the fall could have
    caused Jahanna's comminuted skull fracture.   But, in the
    circumstances of this case, the jury would need to determine
    more than whether such injuries were unexpected or very
    unlikely; they would need to determine whether they were certain
    beyond a reasonable doubt that these injuries were not caused by
    an accidental fall from the sofa onto the hardwood floor.
    The judge accurately found that, although "Dr. Uscinski
    . . . testified that retinal hemorrhaging can be caused by an
    increase in intracranial pressure and noted that such increase
    was present in [this] case . . . , he did not opine specifically
    Mechanisms, 122 Acta Neuropathologica 519 (2011) (same);
    Cummings, Trelka, & Springer, Atlas of Forensic Histopathology,
    Cambridge Univ. Press (2011) (skull fractures, subdural
    hematomas, and retinal hemorrhages have all been found after
    short falls); Lantz & Couture, Fatal Acute Intracranial Injury,
    Subdural Hematoma, and Retinal Hemorrhages Caused by Stairway
    Fall, 56(6) J. Forensic Sciences 1648 (2011) (case study of
    infant who fell from short height and had subdural hemorrhage,
    midline shift, mild edema, and severe retinal hemorrhages).
    35
    as to whether Jahanna's retinal hemorrhages were caused by this
    increased intracranial pressure."17   But the judge erred in
    concluding that this meant that the defendant was not deprived
    of a substantial ground of defense by the failure to retain a
    defense expert.   The defendant bears the burden of proving the
    second prong of the Saferian test, but he may meet this burden
    by showing that the poor performance of his attorney deprived
    him of expert evidence that would likely have influenced the
    jury's conclusion as to whether the prosecution had eliminated
    reasonable doubt regarding the cause of Jahanna's retinal
    hemorrhages; the defendant is not required conclusively to prove
    that the intracranial pressure arising from the accidental fall
    was the cause of the retinal hemorrhages.   See, e.g.,
    Commonwealth v. Polk, 
    462 Mass. 23
    , 34 (2012) (evidence
    regarding alleged victim in sexual assault case that is
    consistent with diagnosis of disorder is "sufficient to permit a
    reasonable inference that the alleged victim may have the
    disorder"); Commonwealth v. Alvarez, 
    433 Mass. 93
    , 103-104
    (2000) (new trial ordered for ineffective assistance of counsel
    17
    Dr. Uscinski testified that a short fall of seventeen and
    one-half inches may account for a subdural hematoma (which he
    called an "intradural hematoma") like the one sustained by
    Jahanna, and that a subdural hematoma, in turn, can cause an
    increase in intracranial pressure, which can result in retinal
    hemorrhages. Dr. Uscinski noted that the computerized
    tomography scans of Jahanna's brain showed an increase in
    intracranial pressure.
    36
    because "the jury may have ruled differently" if medical
    evidence of defendant's brain damage had been properly
    investigated, reviewed with the defense expert, and presented at
    trial).   See also Strickland, 
    466 U.S. at 693
    .
    We recognize that the testimony of Drs. Newton and Mantagos
    regarding the cause of Jahanna's injuries finds support in
    scientific research, and that numerous scientific studies were
    cited in support of their opinions.18   But a defense expert could
    have assisted a competent defense attorney in mounting a
    significant challenge to their opinions at trial on cross-
    examination by identifying the methodological shortcomings of
    18
    See, e.g., Trenchs, Curcoy, Morales, Serra, Navarro, &
    Pou, Retinal Haemorrhages in Head Trauma Resulting from Falls:
    Differential Diagnosis with Non-Accidental Trauma in Patients
    Younger Than 2 Years of Age, 24 Child's Nervous System 815, 818-
    819 (2008) (study of infants who sustained accidental falls
    showed that accidental falls provoked only small, isolated, and
    unilateral retinal hemorrhages, whereas inflicted injury caused
    bilateral and diffuse retinal hemorrhages); Newton & Vandeven,
    Update on Child Maltreatment with a Special Focus on Shaken Baby
    Syndrome, 17 Current Opinion in Pediatrics 246, 249 (2005)
    (based on review of studies on shaken baby syndrome, retinal
    hemorrhage found to be much more common in inflicted than non-
    inflicted injuries); Schloff, Mullaney, Armstrong,
    Simantirakais, Humphreys, Myseros, Buncie, & Levin, Retinal
    Findings in Children with Intracranial Hemorrhage, 109
    Ophthalmology 1472, 1475 (2002) ("Our study suggests that
    intraretinal hemorrhages in children with intracranial
    hemorrhage from causes other than shaken baby syndrome would be
    expected in less than [eight per cent] of cases").
    37
    the studies they cited.19   A defense expert could also have
    assisted a competent defense attorney in highlighting in cross-
    examination the studies that recognize the difficulties faced by
    physicians in accurately diagnosing the cause of injuries that
    19
    See, e.g., Vinchon, Defoort-Dhellemmes, Desurmont, &
    Dhellemmes, Accidental and Nonaccidental Head Injuries in
    Infants: A Prospective Study, 102 J. Neurosurgery: Pediatrics
    380, 383 (2005) ("[T]he evaluation of the incidence of [retinal
    hemorrhages] in child abuse remains a self-fulfilling prophecy"
    because children are diagnosed as being abused "in great part
    based on the presence of [retinal hemorrhage]"); Donohoe,
    Evidence-Based Medicine and Shaken Baby Syndrome, 24 Am. J.
    Forensic Med. & Pathology 239, 240-241 (2003) (performing review
    of shaken baby syndrome literature from 1966 through 1998 and
    concluding that "there existed serious data gaps, flaws of
    logic, inconsistency of case definition, and a serious lack of
    tests capable of discriminating [non-accidental injury] cases
    from natural injuries. . . . [By 1999] the commonly held
    opinion that the finding of [subdural hematoma] and [retinal
    hemorrhages] in an infant was strong evidence of [shaken baby
    syndrome] was unsustainable"). For example, in one study
    seeking to determine whether short falls of children cause
    death, after finding an unexpectedly large number of deaths
    after reported short falls, the author excluded those deaths
    because they assumed those reports to be false. See Chadwick,
    Chin, Salerno, Landsverk, & Kitchen, Deaths from Falls in
    Children: How Far Is Fatal?, 31 J. Trauma 1353, 1355 (1991).
    The challenges to this research have not subsided. See,
    e.g., Gabaeff, Exploring the Controversy in Child Abuse
    Pediatrics & False Accusations of Abuse, 18 Legal Med. 90, 93
    (2016) (documenting unreliability of confessions used in shaken
    baby syndrome research); Guthkelch, Problems of Infant Retino-
    Dural Hemorrhage with Minimal External Injury, 12 Houst. J.
    Health L. & Pol'y 201, 207 (2012) ("[Shaken baby syndrome] and
    [abusive head trauma] are hypotheses that have been advanced to
    explain findings that are not yet fully understood. . . . [They
    are] not proven medical or scientific facts").
    38
    allegedly result from child abuse.20   See Commonwealth v. Baran,
    
    74 Mass. App. Ct. 256
    , 277 (2009) (expert could have
    strengthened cross-examination and provided material for
    rebuttal).   See also Dugas v. Coplan, 
    428 F.3d 317
    , 340 (1st
    Cir. 2005) (had defense counsel been advised by expert in arson
    case, "his cross-examination of the fire investigators could
    have been far more pointed").
    Considering together the opinion testimony regarding the
    cause of Jahanna's head and vertebral injuries that reasonably
    could have been offered by a defense expert and the assistance
    such an expert could have offered to defense counsel's cross-
    examination of the Commonwealth's medical experts, we conclude
    20
    See, e.g., Christian, Taylor, Hertle, & Duhaime, Retinal
    Hemorrhages Caused by Accidental Household Trauma, 135 J.
    Pediatrics 125, 127 (1999) (recognizing overlap between
    accidental and abusive head injury and cautioning against
    presumption of abuse when infants under one year present with
    traumatic retinal hemorrhages); Sirotnak, Medical Disorders that
    Mimic Abusive Head Trauma, in Abusive Head Trauma in Infants and
    Children 191 (2006) (many conditions mimic abusive head trauma);
    Barnes, Ethical Issues in Imaging Nonaccidental Injury: Child
    Abuse, 13(2) Topics in Magnetic Resonance Imaging 85, 86-87, 91
    (2002) (applying standard of evidence-based medicine to shaking
    mechanism and concluding that no scientific basis exists
    indicating force required to produce traumatic brain injury and
    that many conditions mimic child abuse); Case, Graham, Handy,
    Jentzen, & Monteleone, Position Paper on Fatal Abusive Head
    Injuries in Infants and Young Children, 22 Am. J. Forensic Med.
    & Pathology 112, 116-117 (2001) (acknowledging that retinal
    hemorrhages have many nontraumatic causes, including increased
    intracranial pressure, bleeding disorders, sepsis, meningitis,
    and vasculopathies, and that pathogenesis of retinal hemorrhages
    is not precisely understood).
    39
    that defense counsel's manifestly unreasonable failure to seek
    public funds to retain such an expert likely deprived the
    defendant of an available, substantial ground of defense.
    Because the defendant was deprived of his constitutional right
    to effective counsel, we vacate the defendant's convictions and
    order a new trial.
    We are not the first State Supreme Court to vacate a
    conviction because defense counsel was ineffective in failing to
    consult with an appropriate medical expert where the theory of
    the prosecution's case was that the defendant injured an infant
    through violent shaking or blunt force trauma.   See, e.g.,
    People v. Ackley, 
    497 Mich. 381
    , 388-398 (2015); State v. Hales,
    
    152 P.3d 321
    , 337-344 (Utah 2007).   Although each case alleging
    abusive head trauma is different and must be evaluated on its
    own facts, the legal analysis used by these two courts that
    yielded the conclusion that a new trial is in the interests of
    justice is similar to our own.
    In Ackley, 497 Mich. at 385, defense counsel contacted only
    one expert in preparing for trial, who advised counsel that
    there was a wide divide within the medical community between
    those who believe that an infant's injuries can be caused by a
    short distance fall and those who believe that such injuries are
    the result of shaking or striking the infant, and that the
    divide is so deeply held that it is "like a religion."   The
    40
    expert told counsel that "he [the expert] was on the wrong side
    of this debate to be able to assist the defendant," but
    recommended a forensic pathologist who had expertise in short
    falls.   Id.    Defense counsel never contacted this forensic
    pathologist or any other expert in short falls, and instead
    relied only on the first expert's advice in cross-examining the
    prosecution's experts.        Id. at 386-387.   The Supreme Court of
    Michigan concluded that "counsel performed deficiently by
    failing to investigate and attempt to secure an expert witness
    who could both testify in support of the defendant's theory that
    the child's injuries were caused by an accidental fall and
    prepare counsel to counter the prosecution's expert medical
    testimony."     Id. at 389.    As to the issue of prejudice, the
    court noted that "[t]here was no explanation for the child's
    injuries beyond the theories presented by the experts, and the
    prosecution produced no witnesses who testified that the
    defendant was ever abusive."        Id. at 395.   The court concluded,
    "Had an impartial, scientifically trained expert corroborated
    the defendant's theory, the defendant's account of the child's
    death would not have existed in a vacuum of his own self-
    interest.      While we cannot say that a battle of the experts
    would have ensured the defendant's acquittal, counsel's failure
    to prepare or show up for the battle sufficiently 'undermine[s
    our] confidence in the outcome" of this case to entitle the
    41
    defendant to relief."   Id. at 397, quoting Strickland, 
    466 U.S. at 694
    .
    In Hales, 152 P.3d at 328-329, a murder case based on a
    theory of shaken baby syndrome, the prosecution at trial relied
    primarily on the testimony of experts that CT scans of the
    infant showed brain injury consistent with violent shaking.         The
    theory of the defense was that the infant's injuries were caused
    by a "near-miss car accident" hours earlier.     Id. at 329.   In
    support of this theory, defense counsel called an expert witness
    who testified that shaking can cause neck injury, but not brain
    injury, and that the most likely cause of the child's injuries
    was a "near-miss car accident that caused the bruising followed
    by a lengthy 'lucid interval.'"    Id.   Defense counsel, however,
    never retained a qualified expert to provide an independent
    interpretation of the CT scans and did not put forth any
    evidence contradicting the prosecution expert's interpretation
    of them.   Id. at 329, 340-341.    Nor did defense counsel offer
    any evidence that his theory of defense comported with the CT
    scan evidence.   Id. at 340-341.   In vacating the conviction, the
    Supreme Court of Utah reasoned that "the defense's theory that
    the injuries were caused by the near-miss car accident depended
    upon convincing the jury that the brain injury shown in the CT
    scans could have been caused by an impact injury and would not
    have caused immediate unconsciousness as [the State's expert]
    42
    had testified."   Id. at 340.    The court concluded that the
    defendant was prejudiced by his counsel's failure because, "had
    his trial attorneys sought out an expert analysis of the CT
    scans, there was a reasonable probability that they would have
    obtained and the jury would have credited [the defense's
    competing] expert testimony regarding the timing, nature, and
    violence of the injury," which was consistent with the injuries
    being caused by the near-miss automobile accident.     Id. at 344.
    In a policy statement issued in May, 2009, the American
    Academy of Pediatrics declared:
    "Few pediatric diagnoses engender as much debate as
    [abusive head trauma] . . . Controversy is fueled because
    the mechanisms and resultant injuries of accidental and
    abusive head injury overlap, the abuse is rarely
    witnessed, an accurate history of trauma is rarely
    offered by the perpetrator, there is no single or simple
    test to determine the accuracy of the diagnosis, and the
    legal consequences of the diagnosis can be so
    significant."
    Christian, Block, & Committee on Child Abuse and Neglect of
    American Academy of Pediatrics, Abusive Head Trauma in Infants
    and Children, Pediatrics, Vol. 123, No. 5, 1409, 1410 (2009).
    By vacating the defendant's convictions in this case and
    ordering a new trial, we do not claim to have resolved the
    ongoing medical controversy as to how often the triad of
    symptoms of abusive head trauma are caused by accidental short
    falls or other medical causes.     We are simply recognizing that
    there is a vigorous debate on this subject, that arguments are
    43
    being made on both sides with support in the scientific and
    medical literature, that this debate is evolving, and that, in
    the circumstances of this case, we do not have confidence in the
    justice of these convictions where defense counsel did not
    retain an expert to evaluate the medical evidence and, as a
    result, the jury heard only one side of this debate.     See
    Hinton, 
    134 S. Ct. at 1090
     (risk of mistakes by prosecution
    experts "is minimized when the defense retains a competent
    expert to counter the testimony of the prosecution's expert
    witnesses").    See generally Melendez-Diaz v. Massachusetts, 
    557 U.S. 305
    , 319 (2009) ("One study of cases in which exonerating
    evidence resulted in the overturning of criminal convictions
    concluded that invalid forensic testimony contributed to the
    convictions in [sixty per cent] of the cases").
    2.   Sufficiency of evidence of assault and battery of child
    causing bodily injury (vertebral fractures).     The defendant
    claims that his conviction of assault and battery of a child
    causing bodily injury (fractured vertebrae) must be reversed and
    dismissed because the evidence was insufficient as a matter of
    law.    In essence, the defendant claims that, because there was
    uncertainty in the evidence as to when the vertebral fractures
    occurred and what caused them, no reasonable jury could find
    beyond a reasonable doubt that these injuries were caused by the
    44
    intentional infliction of force by the defendant on the evening
    of October 20 when he was Jahanna's sole caretaker.
    In determining whether a defendant is entitled to a
    required finding of not guilty, we consider whether, viewing the
    evidence in the light most favorable to the Commonwealth, a
    reasonable jury could have found the essential elements of the
    crime beyond a reasonable doubt.   Commonwealth v. Latimore, 
    378 Mass. 671
    , 676-677 (1979).   At trial, Dr. Newton offered the
    opinion that the fractured vertebrae were caused by "some type
    of crushing force," which could include the extreme flexion
    caused by violent shaking, and that they could not be caused by
    the force involved in a short household fall.   Although Dr.
    Newton admitted that the age of the fractured vertebrae could
    not be discerned from the CT scan, a reasonable jury, viewing
    the totality of the evidence in the light most favorable to the
    prosecution, could have concluded beyond a reasonable doubt that
    Jahanna's head injuries were caused by a violent shaking on the
    evening of October 20, when the defendant was her sole
    caretaker, and that the same shaking that caused these injuries
    produced the extreme flexion that fractured her vertebrae.
    Therefore, the judge did not err in denying the defendant's
    motion for a required finding of not guilty on this indictment.
    Conclusion.   For the reasons stated above, the judge's
    order denying the motion for a new trial is reversed, and the
    45
    judgments of conviction are vacated.   The case is remanded to
    the Superior Court for a new trial on these two indictments.
    So ordered.