Gonzales v. Nebraska Pediatric Practice , 308 Neb. 571 ( 2021 )


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    Nebraska Supreme Court Advance Sheets
    308 Nebraska Reports
    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
    Cite as 
    308 Neb. 571
    Rosa Gonzales and Javier Rojas, individually
    and as parents and next friends of Joaquin
    Rojas, a minor, appellants, v. Nebraska
    Pediatric Practice, Inc., and Corey
    S. Joekel, M.D., appellees.
    ___ N.W.2d ___
    Filed March 5, 2021.    No. S-20-253.
    1. Courts: Expert Witnesses. A trial court acts as a gatekeeper to ensure
    the evidentiary relevance and reliability of an expert’s opinion.
    2. ____: ____. An evaluation under Schafersman v. Agland Coop, 
    262 Neb. 215
    , 
    631 N.W.2d 862
     (2001), generally consists of four factors, includ-
    ing a determination of (1) whether the witness is qualified to testify as
    an expert, (2) whether the witness’ testimony is supported by scientifi-
    cally valid and reliable methodology or reasoning, (3) whether the rea-
    soning or methodology has been properly applied to the facts in issue,
    and (4) whether the testimony’s probative value is not substantially
    outweighed by danger of unfair prejudice.
    3. Judgments: Appeal and Error. For purposes of a law-of-the-case
    analysis, construction of an appellate court’s prior opinion is determined
    by an appellate court as a matter of law.
    4. ____: ____. An appellate court reviews matters of law de novo, indepen-
    dently of the lower court’s determination.
    5. Summary Judgment: Appeal and Error. An appellate court reviews
    a grant of summary judgment de novo, viewing the record in the light
    most favorable to the nonmoving party and drawing all reasonable infer-
    ences in that party’s favor.
    6. ____: ____. An appellate court affirms a grant of summary judgment if
    the pleadings and admitted evidence show that there is no genuine issue
    as to any material facts or as to the ultimate inferences that may be
    drawn from the facts and that the moving party is entitled to judgment
    as a matter of law.
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    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
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    7. Actions: Appeal and Error. Law of the case is a procedural doctrine
    that bars reconsideration of the same or similar issues at successive
    stages of the same suit or prosecution.
    8. ____: ____. The law-of-the-case doctrine reflects the principle that to
    promote finality and to protect parties’ settled expectations, an issue liti-
    gated and terminally decided in one stage of a case should not be later
    resuscitated at a later stage.
    9. Appeal and Error. Under the law-of-the-case doctrine, the holdings of
    an appellate court on questions presented to it for review become the
    law of the case.
    10. ____. Under the law-of-the-case doctrine, unless the facts presented on
    remand are shown by the petitioner to be materially and substantially
    different, an appellate court’s prior holdings conclusively settle all mat-
    ters ruled upon, either expressly or by necessary implication.
    11. Pretrial Procedure: Expert Witnesses. An objection under Schafersman
    v. Agland Coop, 
    262 Neb. 215
    , 
    631 N.W.2d 862
     (2001), must take the
    form of a concise pretrial motion.
    12. ____: ____. In terms of the factors under Schafersman v. Agland Coop,
    
    262 Neb. 215
    , 
    631 N.W.2d 862
     (2001), a motion to exclude should iden-
    tify what is believed to be lacking with respect to the expert testimony
    at issue.
    13. ____: ____. A motion to exclude expert testimony should be stated with
    enough specificity as to a particular factor that the court understands
    what is being challenged and can accordingly determine the necessity
    and extent of any pretrial proceedings.
    14. Expert Witnesses: Proof. It is the objecting party’s burden to raise an
    adequately specific objection to expert testimony.
    15. Expert Witnesses: Waiver. A failure to make an adequately specific
    objection to expert testimony will result in a waiver of the right to object
    on that basis.
    16. Appeal and Error. For purposes of a law-of-the-case analysis, it is
    enough for an appellate court to recognize the scope of issues conclu-
    sively settled in the appellate court’s prior opinion.
    17. ____. An appellate court interprets the scope of an appellate court’s
    prior opinion as a matter of law without regard to the parties’ or even
    the prior appellate court’s subjective interpretations.
    18. ____. An appellate court is not obligated to engage in an analysis that is
    not necessary to adjudicate the case and controversy before it.
    Appeal from the District Court for Douglas County: James
    T. Gleason, Judge. Reversed and remanded for further
    proceedings.
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    Nebraska Supreme Court Advance Sheets
    308 Nebraska Reports
    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
    Cite as 
    308 Neb. 571
    Greg Garland, of Garland Medmal, L.L.C., Tara DeCamp,
    of DeCamp Law, P.C., L.L.O., and Kathy Pate Knickrehm
    for appellants.
    Sarah M. Dempsey, Patrick G. Vipond, and Michael L.
    Storey, of Lamson, Dugan & Murray, L.L.P., for appellees.
    Heavican, C.J., Miller-Lerman, Cassel, Stacy, Funke,
    Papik, and Freudenberg, JJ.
    Heavican, C.J.
    I. INTRODUCTION
    Appellants Rosa Gonzales and Javier Rojas are the parents
    of Joaquin Rojas, a minor who suffered a brain injury. Alleging
    that Joaquin’s brain injury was caused by Dr. Corey Joekel,
    M.D., when he misdiagnosed and failed to treat Joaquin’s con-
    dition, appellants brought a malpractice action against appel-
    lees Joekel and his employer, Nebraska Pediatric Practice, Inc.
    Based on appellees’ objection, the district court found the
    expert testimony of appellants’ key witness inadmissible. After
    excluding that testimony, the district court granted summary
    judgment to appellees.
    For the reasons set forth herein, we reverse the district
    court’s order granting summary judgment and remand the cause
    for further proceedings consistent with this opinion.
    II. BACKGROUND
    1. Complaint
    On August 5, 2012, Joaquin, who was then 5 years old, was
    exhibiting symptoms consistent with mononucleosis, a com-
    mon condition frequently caused by the Epstein-Barr virus
    (EBV). Gonzales brought Joaquin to the emergency depart-
    ment at Children’s Hospital and Medical Center (CHMC) in
    Omaha, Nebraska. After an examination, an emergency depart-
    ment physician diagnosed Joaquin with mononucleosis and
    discharged him.
    Over the next 2 days, Joaquin continued to exhibit many
    of the same symptoms. Concerned that some of Joaquin’s
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    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
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    308 Neb. 571
    symptoms might be worsening, Gonzales returned Joaquin to
    the emergency department at CHMC the morning of August 7,
    2012. Joekel, the attending emergency department physician,
    examined Joaquin and diagnosed him with mononucleosis.
    Joekel ordered Joaquin discharged at 8:44 a.m.
    Approximately 31⁄2 hours later, Joaquin began to seize.
    Gonzales called the 911 emergency dispatch system, and
    Joaquin was transported by ambulance to the University of
    Nebraska Medical Center (UNMC) in Omaha. At 12:39 p.m.,
    Joaquin was admitted to the emergency department at UNMC.
    He was unresponsive and exhibiting decreased respirations.
    After UNMC staff administered antiepileptic medication,
    Joaquin began to gradually regain consciousness. Joaquin was
    diagnosed with EBV meningoencephalitis, a serious infection
    of the brain and surrounding tissue that can arise as a compli-
    cation of mononucleosis.
    Joaquin also experienced brain swelling and oxygen loss.
    On August 10, 2012, surgeons at UNMC performed a decom-
    pressive craniectomy, removing sections of Joaquin’s skull
    to relieve pressure on his brain. On September 5, UNMC
    surgeons performed a cranioplasty to replace the sections of
    Joaquin’s skull that they had removed.
    On September 10, 2012, Joaquin was transferred to a reha-
    bilitation center for physical and speech therapy. He was
    discharged home on October 13. Joaquin’s parents allege that
    when Joaquin then attended school, he displayed symptoms
    of a brain injury, including learning deficits that required his
    placement in special education classes.
    On August 1, 2014, appellants filed a complaint in the
    district court for Douglas County, asserting that Joaquin’s
    injuries were attributable to Joekel’s professional negligence.
    On behalf of themselves and Joaquin, appellants sought dam-
    ages from appellees under the Nebraska Hospital-Medical
    Liability Act. 1
    1
    
    Neb. Rev. Stat. §§ 44-2801
     to 44-2855 (Reissue 2010).
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    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
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    308 Neb. 571
    2. First Appeal
    As the case progressed toward trial, a dispute arose concern-
    ing the admissibility of certain expert testimony. Pursuant to
    
    Neb. Rev. Stat. § 27-702
     (Reissue 2016), appellants moved
    to admit the testimony of Dr. Todd Lawrence, a family and
    emergency room physician, “on all elements of proof required
    to prove a prima facie case of medical malpractice.” Lawrence
    planned to opine that Joaquin’s medical outcome would have
    been better if, on August 7, 2012, Joekel would not have mis-
    diagnosed Joaquin and failed to admit him for further treatment
    at CHMC.
    Appellees moved to prevent Lawrence from testifying to
    this opinion. Their basis for objecting to Lawrence’s testimony
    was, in part, Schafersman v. Agland Coop (Schafersman I ), 2 the
    case in which we adopted the framework set forth in Daubert
    v. Merrell Dow Pharmaceuticals, Inc., 3 and its progeny 4 for
    evaluating whether to admit expert testimony.
    [1,2] Under our Schafersman I jurisprudence, the trial court
    acts as a gatekeeper to ensure the evidentiary relevance and
    reliability of an expert’s opinion. 5 A Schafersman I evalua-
    tion generally consists of four factors, including a determi­
    nation of (1) whether the witness is qualified to testify as an
    expert, (2) whether the witness’ testimony is supported by
    scientifically valid and reliable methodology or reasoning,
    (3) whether the reasoning or methodology has been properly
    applied to the facts in issue, and (4) whether the testimony’s
    2
    Schafersman v. Agland Coop, 
    262 Neb. 215
    , 
    631 N.W.2d 862
     (2001).
    3
    Daubert v. Merrell Dow Pharmaceuticals, Inc., 
    509 U.S. 579
    , 
    113 S. Ct. 2786
    , 
    125 L. Ed. 2d 469
     (1993).
    4
    See, e.g., Kumho Tire Co. v. Carmichael, 
    526 U.S. 137
    , 
    119 S. Ct. 1167
    ,
    
    143 L. Ed. 2d 238
     (1999); General Electric Co. v. Joiner, 
    522 U.S. 136
    ,
    
    118 S. Ct. 512
    , 
    139 L. Ed. 2d 508
     (1997).
    5
    See Schafersman I, 
    supra note 2
    . See, also, State v. Simmer, 
    304 Neb. 369
    ,
    
    935 N.W.2d 167
     (2019).
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    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
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    probative value is not substantially outweighed by danger of
    unfair prejudice. 6
    Appellees also moved for summary judgment, claiming that
    without Lawrence’s testimony, appellants could not prove cau-
    sation, an essential element in a medical malpractice case. 7
    After an evidentiary hearing, the district court agreed with
    appellees that Lawrence’s testimony was inadmissible. The
    court excluded the testimony on two bases: first, that under
    Schafersman I, Lawrence was unqualified to testify about cau-
    sation as an expert; and second, that under our line of cases
    concerning the relevance of expert testimony, 8 Lawrence’s
    opinions amounted to inadmissible loss-of-chance testimony.
    In a separate order, the district court granted appellees’ motion
    for summary judgment.
    On the first appeal of this case, the Nebraska Court of
    Appeals affirmed in part, and in part reversed and remanded
    for further proceedings. 9 All three of the panel’s judges agreed
    that a portion of Lawrence’s opinions amounted to loss-of-
    chance testimony, “which, in Nebraska, is insufficient to estab-
    lish causation.” 10
    Yet as to the portion of Lawrence’s opinions that the court
    found was not loss-of-chance testimony, the panel divided
    on whether Lawrence was qualified to render such opinions.
    After a thorough analysis applying the relevant Schafersman I
    factors, a majority of the Court of Appeals concluded that
    6
    See Epp v. Lauby, 
    271 Neb. 640
    , 
    715 N.W.2d 501
     (2006). See, also,
    Simmer, 
    supra note 5
    .
    7
    See Ewers v. Saunders County, 
    298 Neb. 944
    , 
    906 N.W.2d 653
     (2018).
    8
    See, e.g., Cohan v. Medical Imaging Consultants, 
    297 Neb. 111
    , 
    900 N.W.2d 732
     (2017), modified on denial of rehearing, 
    297 Neb. 568
    , 
    902 N.W.2d 98
    ; Richardson v. Children’s Hosp., 
    280 Neb. 396
    , 
    787 N.W.2d 235
     (2010); Rankin v. Stetson, 
    275 Neb. 775
    , 
    749 N.W.2d 460
     (2008).
    9
    See Gonzales v. Nebraska Pediatric Practice, 
    26 Neb. App. 764
    , 
    923 N.W.2d 445
     (2019).
    10
    
    Id. at 786
    , 923 N.W.2d at 461.
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    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
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    308 Neb. 571
    Lawrence was qualified and that therefore, the district court
    had abused its discretion in excluding Lawrence’s testimony, 11
    with one judge concurring in part, and in part dissenting. 12 The
    Court of Appeals then remanded the cause “for further pro-
    ceedings in compliance with [its] opinion.” 13
    3. Orders on Remand
    On remand, appellees renewed their objection that
    Lawrence’s testimony was inadmissible under Schafersman I.
    They moved to amend the scheduling order to name an addi-
    tional expert witness, Dr. Daniel Bonthius, a neurologist and
    pediatrician who specialized in viral encephalitis.
    Then, supported by live video testimony from Bonthius,
    affidavits from two other physicians who specialized in pedi-
    atric epilepsy and infectious disease, and three articles from
    medical journals, appellees challenged Lawrence’s testimony
    under the second and third Schafersman I factors. To wit,
    appellees contended that Lawrence’s testimony would depend
    on invalid “methods or scientific knowledge” and would not
    properly apply valid methods or reasoning to the facts in
    issue. Further, on the condition that their motion to exclude
    Lawrence’s testimony was granted, appellees moved again for
    summary judgment.
    At a hearing on appellees’ motions, appellants objected
    to the form of Bonthius’ testimony. But because appellees
    had provided nearly 4 months’ notice of their intent to offer
    Bonthius’ testimony by live video, and because appellants
    had only begun objecting to Bonthius’ testimony in that form
    on the day before the hearing, the district court concluded
    that appellants had “implicitly agreed” to such testimony
    by their conduct. The district court thus received Bonthius’
    11
    See Gonzales, 
    supra note 9
    .
    12
    But see 
    id.
     (Bishop, Judge, concurring in part, and in part dissenting).
    13
    Id. at 799, 923 N.W.2d at 468.
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    testimony by live video pursuant to 
    Neb. Rev. Stat. § 24-734
    (4)
    (Reissue 2016). 14
    The district court then granted appellees’ motion to
    exclude Lawrence’s testimony from trial. Despite finding that
    Lawrence was qualified as a physician and entitled to give
    “medical opinions,” the district court found that his testimony
    “with regard to the causation of seizures and the extent and
    longevity thereof are not within his skill set and[,] based on
    the testimony of [Bonthius], are not consistent with current
    medical knowledge in the area.” Accordingly, the district
    court ordered that “causation opinions regarding any relation-
    ship between [EBV meningoencephalitis] and seizures offered
    by Dr. Lawrence must be stricken.” Because appellants’ argu-
    ment for causation depended for support on Lawrence’s tes-
    timony, the district court also granted summary judgment
    to appellees.
    Appellants filed a timely notice of appeal. 15 While the
    appeal was pending, appellees requested a supplemental bill
    of exceptions containing the records from two hearings. The
    court reporter averred that she was unable to produce a record
    for one of the hearings because no stenographic record had
    been made.
    Appellees moved for an order nunc pro tunc to augment the
    bill of exceptions with an affidavit from their attorney that had
    allegedly been received at that hearing but not included in the
    record. Finding that the affidavit had been properly received
    as evidence but “inadverten[tly]” left out of the record due to
    “clerical error” by the court reporter, the district court granted
    appellees’ motion and ordered the affidavit included in the bill
    of exceptions.
    We moved the appeal to our docket. 16
    14
    See, also, 2020 Neb. Laws, L.B. 912 (codified as § 24-734 (Cum. Supp.
    2020), amending § 24-734(4) after relevant time in this case).
    15
    See 
    Neb. Rev. Stat. § 25-1912
     (Cum. Supp. 2020).
    16
    See 
    Neb. Rev. Stat. § 24-1106
    (3) (Cum. Supp. 2020).
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    GONZALES v. NEBRASKA PEDIATRIC PRACTICE
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    308 Neb. 571
    III. ASSIGNMENTS OF ERROR
    Appellants assign three errors, which we restate as fol-
    lows: (1) that the district court was precluded, under the law
    of the case, from excluding the testimony of their expert,
    Lawrence; (2) that the district court violated the law of the
    case, Schafersman I, and § 24-734(4) in admitting the testi-
    mony of appellees’ experts; and (3) that the district court erred
    in granting summary judgment.
    IV. STANDARD OF REVIEW
    [3,4] For purposes of a law-of-the-case analysis, construc-
    tion of an appellate court’s prior opinion is determined by an
    appellate court as a matter of law. 17 An appellate court reviews
    matters of law de novo, independently of the lower court’s
    determination. 18
    [5,6] An appellate court reviews a grant of summary judg-
    ment de novo, viewing the record in the light most favorable
    to the nonmoving party and drawing all reasonable inferences
    in that party’s favor. 19 An appellate court affirms a grant of
    summary judgment if the pleadings and admitted evidence
    show that there is no genuine issue as to any material facts or
    as to the ultimate inferences that may be drawn from the facts
    and that the moving party is entitled to judgment as a matter
    of law. 20
    V. ANALYSIS
    1. Preclusion Under Law of Case
    We begin our analysis by considering the district court’s
    decision to exclude Lawrence’s testimony. Appellants contend
    that the Court of Appeals’ earlier opinion in this case con-
    clusively settled that Lawrence’s testimony was admissible.
    17
    See TransCanada Keystone Pipeline v. Tanderup, 
    305 Neb. 493
    , 
    941 N.W.2d 145
     (2020).
    18
    See 
    id.
    19
    Kaiser v. Allstate Indemnity Co., 
    307 Neb. 562
    , 
    949 N.W.2d 787
     (2020).
    20
    
    Id.
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    Thus, they allege, the law of the case precluded appellees’
    renewed Schafersman I objection on remand to Lawrence’s
    testimony.
    [7,8] Law of the case is a procedural doctrine that bars
    reconsideration of the same or similar issues at successive
    stages of the same suit or prosecution. 21 The doctrine reflects
    the principle that to promote finality and to protect parties’
    settled expectations, an issue litigated and terminally decided
    in one stage of a case should not be later resuscitated at a
    later stage. 22
    [9,10] Under the law-of-the-case doctrine, the holdings of an
    appellate court on questions presented to it for review become
    the law of the case. 23 Thereafter, unless the facts presented on
    remand are shown by the petitioner to be materially and sub-
    stantially different, the appellate court’s holdings conclusively
    settle all matters ruled upon, either expressly or by neces-
    sary implication. 24
    Here, we agree with appellants that the admissibility of
    Lawrence’s testimony was conclusively settled by the Court
    of Appeals and that therefore, appellees’ renewed objec-
    tion on remand to that testimony was precluded. Among the
    questions presented to the Court of Appeals for review were
    whether Lawrence’s opinions had met the requirements for
    reliability and relevance under Schafersman I to be admis-
    sible as expert testimony “on the subject of causation of
    Joaquin’s injuries.” 25
    After thoroughly analyzing Lawrence’s testimony against
    the relevant factors, the Court of Appeals answered in
    the affirmative:
    21
    See State v. Price, 
    306 Neb. 38
    , 
    944 N.W.2d 279
     (2020).
    22
    See Parks v. Hy-Vee, 
    307 Neb. 927
    , 
    951 N.W.2d 504
     (2020). See, also,
    State v. Thompson, 
    69 Neb. 157
    , 
    95 N.W. 47
     (1903).
    23
    See Price, 
    supra note 21
    .
    24
    See 
    id.
     See, also, Carpenter v. Cullan, 
    254 Neb. 925
    , 
    581 N.W.2d 72
    (1998).
    25
    Gonzales, 
    supra note 9
    , 26 Neb. App. at 783, 923 N.W.2d at 460.
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    Dr. Lawrence clearly possesses special knowledge
    respecting the causation of brain injury and scarring from
    seizures superior to that of persons in general as to make
    his formation of a judgment a fact of probative value. .
    . . If [a]ppellees have more specialized experts and evi-
    dence to attack Dr. Lawrence’s conclusions, [a]ppellees
    remain capable of cross-examining Dr. Lawrence and
    bringing their own experts and evidence to counter his
    opinions. However, this becomes a question of fact for
    the fact finder. 26
    Thus, the Court of Appeals held that the district court had
    “abused its discretion in determining that Dr. Lawrence was
    unqualified under § 27-702 to testify on causation as to the
    injuries Joaquin suffered due to Dr. Joekel’s failure to hospi-
    talize, treat, and control Joaquin’s seizure, the sole causation
    opinion offered by Dr. Lawrence . . . .” 27
    That holding by the Court of Appeals established the law
    of the case. It conclusively settled that under Schafersman I,
    Lawrence’s testimony was admissible to prove causation in
    this case.
    Because Bonthius’ testimony is nothing more than a new
    opinion concerning facts that already existed before remand,
    it does not qualify as a material and substantial difference
    in the facts underlying the Court of Appeals’ decision such
    that it should displace the application of the law-of-the-case
    doctrine. 28 And unlike expert testimony in a retrial, which we
    have said is not necessarily precluded by foundational chal-
    lenges raised before, 29 Lawrence’s opinions on remand are
    essentially the same as those the Court of Appeals consid-
    ered previously. At the least, appellees have failed to show
    26
    Id. at 794, 923 N.W.2d at 465-66.
    27
    Id. at 795, 923 N.W.2d at 466.
    28
    See Talle v. Nebraska Dept. of Soc. Servs., 
    253 Neb. 823
    , 
    572 N.W.2d 790
    (1998).
    29
    See State v. Davlin, 
    272 Neb. 139
    , 
    719 N.W.2d 243
     (2006).
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    a material and substantial difference. 30 Therefore, under the
    Court of Appeals’ opinion, appellees were precluded from
    renewing, on remand, their Schafersman I-based objections to
    Lawrence’s testimony.
    Appellees urge us to parse the scope of the Court of Appeals’
    opinion more narrowly. By appellees’ reading, the opinion
    settled only one issue under Schafersman I—Lawrence’s quali-
    fications—and did not reach the separate Schafersman I issues
    of whether Lawrence’s testimony was supported by scientifi-
    cally valid methodology and whether it properly applied such
    methodology to the facts in issue.
    Appellees cite language in the Court of Appeals’ opinion
    that they claim “invited” objections based on these grounds
    after remand. 31 The Court of Appeals stated:
    [W]e express no opinion as to whether [Dr. Lawrence’s]
    theory or methodology supporting the opinion are valid,
    whether the theory or methodology were properly applied
    to the facts in this case, or whether Dr. Lawrence’s tes-
    timony is more probative or prejudicial. To the extent
    [a]ppellees were challenging those factors, those com-
    ponents of the Daubert/Schafersman analysis were not
    addressed by the district court in its order. 32
    But while we agree that by its express acknowledgment
    the Court of Appeals elected not to separately analyze those
    Schafersman I factors, we disagree that the factors remained
    subject to challenge on remand.
    [11-15] As the Court of Appeals noted elsewhere in its opin-
    ion, a Schafersman I objection must take the form of a concise
    pretrial motion. 33 Such motion should identify, in terms of the
    Schafersman I factors, what is believed to be lacking with
    30
    See Carpenter, 
    supra note 24
    .
    31
    Brief for appellees at 27.
    32
    Gonzales, 
    supra note 9
    , 26 Neb. App. at 795, 923 N.W.2d at 466.
    33
    See Gonzales, 
    supra note 9
    . See, also, Simmer, 
    supra note 5
    .
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    respect to the expert testimony at issue. 34 It should be stated
    with enough specificity as to a particular factor that the court
    understands what is being challenged and can accordingly
    determine the necessity and extent of any pretrial proceed-
    ings. 35 It is the objecting party’s burden to raise an adequately
    specific objection to expert testimony. 36 Because this specific-
    ity requirement is necessary to protect judicial economy and
    resources, 37 a failure to make an adequately specific objection
    to expert testimony will result in a waiver of the right to chal-
    lenge that factor. 38
    Considering this established waiver rule, we are satisfied
    that it explains why the Court of Appeals declined to separately
    analyze the Schafersman I factors raised in appellees’ renewed
    objection on remand. 39 After stating the waiver rule, the Court
    of Appeals found:
    It is unclear from the record whether [a]ppellees’
    [Schafersman I] challenge to Dr. Lawrence was limited
    to his qualifications to testify or whether [a]ppellees were
    extending their challenge to his theory or methodology
    and/or his application of the facts to his theory or meth-
    odology. See brief for appellees at 28 (arguing that Dr.
    Lawrence’s opinions “were not sufficiently reliable”). We
    note the Nebraska Supreme Court’s admonition that a
    Daubert/Schafersman challenge should specifically iden-
    tify which of the factors is believed to be lacking. We
    also note this record is somewhat devoid of analysis as it
    relates to those other specific factors. 40
    34
    See Simmer, 
    supra note 5
    .
    35
    See In re Interest of Christopher T., 
    281 Neb. 1008
    , 
    801 N.W.2d 243
    (2011).
    36
    See 
    id.
    37
    State v. Herrera, 
    289 Neb. 575
    , 
    856 N.W.2d 310
     (2014).
    38
    See, e.g., Simmer, 
    supra note 5
    ; In re Interest of Christopher T., supra
    note 35.
    39
    Gonzales, 
    supra note 9
    .
    40
    Id. at 789, 923 N.W.2d at 463.
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    By finding “unclear” appellees’ other Schafersman I­-based
    objections in the record, the Court of Appeals determined that
    the objections had not been raised with adequate specificity. 41
    According to the Court of Appeals, appellees’ passing charac-
    terization of Lawrence’s testimony as “‘not sufficiently reli-
    able’” was not an adequately specific objection. 42 We thus read
    the Court of Appeals’ opinion as deciding that to the extent
    appellees had wished to challenge Lawrence’s testimony on
    Schafersman I grounds beyond his alleged lack of qualifica-
    tions, they had waived those challenges.
    [16,17] We do not judge the merits of that decision here,
    because for purposes of our law-of-the-case analysis, it is
    enough for us to recognize the scope of issues conclusively
    settled in the Court of Appeals’ opinion. 43 We interpret its
    scope as a matter of law without regard to the parties’ or even
    the Court of Appeals’ subjective interpretations. 44 It is that de
    novo interpretation of the opinion that leads us to conclude the
    Court of Appeals applied our waiver rule, thus precluding fur-
    ther challenges to Lawrence’s testimony based not only on his
    qualifications but also on all other Schafersman I factors.
    Our waiver rule may not have been the Court of Appeals’
    only justification for declining to analyze the Schafersman I
    factors raised in appellees’ renewed objection on remand. The
    Court of Appeals also noted that under principles of judicial
    restraint, it could avoid analyzing those factors because the
    district court had not analyzed them, grounding its decision
    instead “solely on the basis of [Lawrence’s] qualification to
    give such opinion.” 45
    But regardless of how many justifications the Court
    of Appeals had for not analyzing the Schafersman I factors
    41
    See 
    id.
    42
    See 
    id.
    43
    See Price, 
    supra note 21
    .
    44
    See, Bayne v. Bayne, 
    302 Neb. 858
    , 
    925 N.W.2d 687
     (2019). See, also,
    Kerndt v. Ronan, 
    236 Neb. 26
    , 
    458 N.W.2d 466
     (1990).
    45
    Gonzales, 
    supra note 9
    , 26 Neb. App. at 789, 923 N.W.2d at 463.
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    raised in appellees’ renewed objection on remand, what matters
    now is our finding that the waiver rule was among those jus-
    tifications. By determining that appellees’ ­qualification-based
    objection lacked merit, in part, and that their other Schafersman I
    objections had been waived, the Court of Appeals conclu-
    sively settled all of appellees’ potential Schafersman I-based
    objections to Lawrence’s testimony.
    We consequently disagree with appellees’ parsing of the
    Court of Appeals’ opinion. Contrary to appellees’ ­interpretation,
    the opinion was not an invitation to relitigate the admissibility
    of Lawrence’s testimony. Nor was appellees’ renewed objec-
    tion fair game on remand. Under our de novo interpretation,
    the Court of Appeals’ opinion ended the parties’ pretrial dispute
    concerning the admissibility of Lawrence’s testimony.
    As the Court of Appeals observed, “[i]f [a]ppellees have
    more specialized experts and evidence to attack Dr. Lawrence’s
    conclusions, [a]ppellees remain capable [at trial] of cross-
    examining Dr. Lawrence and bringing their own experts and
    evidence to counter his opinions.” 46 But for purposes of this
    Schafersman I motion to exclude, appellees’ renewed objection
    on remand to Lawrence’s testimony was precluded under the
    law of the case.
    Consistent with appellants’ first assignment of error, we find
    that the district court’s order excluding Lawrence’s testimony
    was in error.
    2. Summary Judgment
    Appellants also raise various arguments for why the district
    court erred in admitting the testimony of appellees’ experts.
    [18] We need not reach those arguments here because an
    appellate court is not obligated to engage in an analysis that
    is not necessary to adjudicate the case and controversy before
    it. 47 Summary judgment in this case depended on ­appellants’
    46
    Id. at 794, 923 N.W.2d at 466.
    47
    See George Clift Enters. v. Oshkosh Feedyard Corp., 
    306 Neb. 775
    , 
    947 N.W.2d 510
     (2020).
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    failure to raise a genuine dispute as to the causation of
    Joaquin’s injury, an essential element of their medical mal-
    practice claim. 48 But because we reverse the order excluding
    Lawrence’s testimony, that testimony is properly in the record
    and raises a genuine dispute about causation, regardless of
    appellees’ evidence. Summary judgment was unwarranted.
    VI. CONCLUSION
    The district court’s order excluding Lawrence’s testimony
    was in error. We reverse the district court’s grant of sum-
    mary judgment and remand the cause for further proceedings
    consist­ent with this opinion.
    Reversed and remanded for
    further proceedings.
    48
    See Ewers, 
    supra note 7
    .