in-the-matter-of-the-workers-compensation-claim-of-marshall-s-little-v , 2013 WY 100 ( 2013 )


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  •                 IN THE SUPREME COURT, STATE OF WYOMING
    
    2013 WY 100
    APRIL TERM, A.D. 2013
    August 22, 2013
    IN THE MATTER OF THE
    WORKER’S COMPENSATION
    CLAIM OF:
    MARSHALL S. LITTLE,
    Appellant
    (Petitioner),
    S-12-0268
    v.
    STATE OF WYOMING ex rel.
    DEPARTMENT OF WORKFORCE
    SERVICES, WORKERS’
    COMPENSATION DIVISION,
    Appellee
    (Respondent).
    Appeal from the District Court of Campbell County
    The Honorable John R. Perry, Judge
    Representing Appellant:
    Donna D. Domonkos, Attorney at Law, Cheyenne, Wyoming
    Representing Appellee:
    Gregory A. Phillips, Wyoming Attorney General; John D. Rossetti, Deputy
    Attorney General; Michael J. Finn, Senior Assistant Attorney General; Michael T.
    Kahler, Senior Assistant Attorney General
    Before KITE, C.J., and HILL, VOIGT, BURKE, and DAVIS, JJ.
    NOTICE: This opinion is subject to formal revision before publication in Pacific Reporter Third.
    Readers are requested to notify the Clerk of the Supreme Court, Supreme Court Building,
    Cheyenne, Wyoming 82002, of any typographical or other formal errors so that correction may be
    made before final publication in the permanent volume.
    DAVIS, Justice.
    [¶1] Appellant Marshall S. Little suffered a lower back injury when he was drawn into
    a mixing chute of a hot mix plant used by the paving company he worked for in 1988.
    He underwent a lumbar surgery in 1989. His condition improved in the early 1990s, and
    he did not require treatment for his back injury for several years. In 2007, he began
    seeing an internist, who diagnosed him with an arthritic hip and recommended a hip
    replacement. Mr. Little submitted a bill for $87.00 for the office visit to the Wyoming
    Workers’ Safety and Compensation Division (the Division).
    [¶2] The Division declined to pay the bill because it believed the hip condition to be
    unrelated to the original work injury. Mr. Little objected and requested a contested case
    hearing before the Office of Administrative Hearings (OAH). The OAH hearing
    examiner found that Mr. Little was not entitled to benefits for a second compensable
    injury, relying on an orthopedic surgeon’s evaluation that the arthritic hip was not related
    to the original compensable injury. The district court affirmed, and we likewise affirm,
    finding that substantial evidence supports the hearing examiner’s findings and
    conclusions in a case involving conflicting expert opinions.
    ISSUE
    [¶3] Does substantial evidence support the hearing examiner’s decision that Mr. Little
    was not entitled to benefits for a second compensable hip injury?
    FACTS
    [¶4] Mr. Little sustained a compensable injury to his lower back and neck on June 8,
    1988. He worked for Cundy Asphalt & Paving Inc. in Gillette, and he was attempting to
    repair the conveyor belt on a hot mix plant. A co-worker accidentally turned the
    conveyor belt on, and Mr. Little was drawn backwards into an 18 x 24 inch chute and
    literally folded in half. He filed a claim for worker’s compensation benefits and began a
    course of treatment with two orthopedic surgeons, Dr. Gerald Baker of Gillette Bone &
    Joint Clinic and Dr. Robert Snider of Orthopedic Surgeons, P.S.C. in Billings, Montana.
    [¶5] The medical records reflecting treatment of Little’s initial injury are incomplete,
    but we can glean the following from what we have. Dr. Baker treated Mr. Little from the
    date of his accident for about two months. Dr. Baker believed that Mr. Little had
    suffered a mild to moderate musculo-ligamentous strain of his lumbar spine, and treated
    him with muscle relaxants, pain medications, and physical therapy.
    [¶6] Dr. Snider first saw Mr. Little about two months after his accident. His initial
    clinical impression was that Mr. Little had suffered a lower back sprain and that he had
    anatomic spinal stenosis or narrowing of the spinal canal at the L3-4 and L4-5 levels of
    1
    the lumbar spine based on a CT scan ordered by Dr. Baker. He was not certain that Little
    was suffering from symptoms caused by compression of the spinal nerves due to the
    stenosis.
    [¶7] Mr. Little reported difficulty walking, as well as pain and numbness in his right
    leg and thighs. However, a functional capacity evaluation ordered by Dr. Snider and
    performed by a physical therapist in December of 1988 concluded that Mr. Little’s
    overall pain level did not correlate with his observed capabilities in testing. The
    evaluation also found poor effort, shaking, and symptom magnification. Dr. Snider’s
    clinic notes from 1988 and 1989 likewise indicated that Mr. Little had “markedly
    exaggerated responses” to certain testing maneuvers, that he seemed to exaggerate his
    symptoms at various times during office visits, and that his complaints of pain were
    anatomically suspect based on the distribution of his perceived pain.
    [¶8] The medical records indicate that Dr. Snider remained unconvinced for a time that
    Mr. Little had suffered any injury other than a sprain, which did not require surgical
    intervention. However, in January of 1989, Dr. Snider evidently changed his mind and
    on February 15, 1989, a decompressive laminectomy at the L3-L4 and L4-L5 level was
    performed on Mr. Little.1 The operative report for that surgery is not in the record, but a
    laminectomy generally removes a portion of a vertebrae called the lamina to relieve
    pressure on spinal nerves. See Stedman’s Medical Dictionary 964 (2000). Mr. Little
    testified that he had a second back surgery after the laminectomy, but we have no records
    of that procedure.
    [¶9] Following the surgery, Mr. Little continued to report persistent pain and
    discomfort in his lower back, buttocks, and right thigh. However, Dr. Snider’s post-
    operative notes indicated that a magnetic resonance imaging study “looks fairly good,”
    and that “he is doing really pretty well.” Dr. Snider also noted that Mr. Little continued
    to display exaggerated responses.
    [¶10] Dr. James Lovitt, another orthopedic surgeon with Dr. Snider’s practice,
    performed a comprehensive physical exam in August of 1989, and found as follows:
    Overall . . . he had no motor function loss with determined
    testing. Sensory exam revealed paresthesia production [a
    sensation of numbness or tingling in the skin] in the medial
    leg below the knees and the dorsal feet. Otherwise, sensory
    exam was unremarkable. Indirect straight leg raising is
    unremarkable. Hamstrings are right. Supine straight leg
    1
    Some of the notes indicate that the surgery was performed by another physician associated with Dr.
    Snider’s office.
    2
    raising produces no symptoms. . . . Looking for motor point
    tenderness in the calves elicited some “tenderness in my
    calves”, however this is not really impressive. . . . There is no
    atrophy. . . . Hips and SI joints unremarkable.
    [¶11] Dr. Lovitt concluded that Mr. Little “has a plethora of nonorganic findings and an
    abnormal pain diagram suggestive of an associated perceptual disorder.”              He
    recommended a lower back brace and believed Mr. Little could benefit from vocational
    rehabilitation which would train him for lighter duty work.
    [¶12] Mr. Little reached maximum medical improvement in September of 1990 and
    received a 27% whole body impairment award for his lower back injury shortly
    thereafter. The record does not reflect any medical treatment for nearly seven years.
    However, from March of 1997 through December of 2000, his orthopedists noted several
    complaints of neck pain, lower back pain, difficulty walking, and pain in his right leg.
    Their overall clinical impression was of cervical spondylosis2 and severe degenerative
    disc disease at the L4-L5 level of the lower back. A physical examination indicated
    normal reflexes at the knee level, but also a “giving way type of resistance in the lower
    extremities” during strength testing.
    [¶13] Mr. Little began seeing Dr. Kirtikumar Patel in July of 2003. Dr. Patel is board-
    certified in internal medicine rather than orthopedics. Dr. Patel initially noted as follows:
    No obvious muscle wasting. . . . Straight leg raising testing
    would increase the pain in the low back. Internal and external
    rotation of the hip joint was normal. Movements of the knees
    and the ankles were normal. The patient had significant pain
    the low back and the paraspinal muscles. The patient had a
    difficult time standing on one foot at a time. Gait was very
    slow and deliberate, trying to fail with the right side.
    Dr. Patel noted complaints of right leg pain in February of 2006, along with difficulty
    with walking and driving long distances. However, Dr. Patel also reported that hip and
    knee movements were normal bilaterally, and that Mr. Little’s gait was normal.
    [¶14] In January of 2007, Dr. Patel diagnosed “developing problems in the right hip area
    and possible osteoarthritis.” X-rays of Mr. Little’s right hip were taken, and the
    radiologist who read them reported “[d]egenerative changes of the hip joints as noted,
    2
    Age-related wear and tear of the spinal discs in the neck. Cervical Spondylosis, MayoClinic.com,
    http://www. mayoclinic.com/health/cervical-spondylosis/DS00697.
    3
    right greater than left.” Dr. Patel’s review of the x-rays also indicated “osteoarthritis,
    more on the right than the left.”3
    [¶15] Mr. Little was admitted to the Campbell County Memorial Hospital for hip pain in
    April of 2009. X-rays were taken, and the radiologist’s report indicated the following:
    FINDINGS: AP view of the pelvis is compared with a prior
    examination from February 2007. There are now more
    advanced arthritic changes of the right hip joint and
    buttressing of the femoral neck when compared to that study.
    . . . Mild to moderate degenerative changes of the left hip
    joint are noted as well and are stable to slightly more
    prominent.
    .   .    .
    IMPRESSION:
    1. Degenerative changes in the lower lumbar spine, and
    pronounced arthritic changes of the right hip, progressing
    from 2007 study, as well as mild to moderate arthritic
    changes of the left hip.
    Following a physical examination and review of x-rays, an emergency room physician
    noted “back and right lower extremity pain, greater than left lower extremity pain with
    degenerative changes . . . .”
    [¶16] In February of 2008, Dr. Patel reported that “the patient has also developed
    significant osteoarthritis, probably because of overcompensation. . . . He may eventually
    need a total hip replacement.” A progress note from March of 2009 likewise indicated
    that Mr. Little complained of right leg pain, and that he walked with “a wobbly gait
    favoring the right leg.” However, Dr. Patel also noted that Mr. Little was able to stand
    without difficulty, and that his right hip, knee, and ankle had normal stability.
    [¶17] Mr. Little returned for another visit with Dr. Patel on February 11, 2010. Dr.
    Patel’s notes from that visit indicated decreased stability, restricted range of motion, and
    tenderness to palpation with the right hip. Dr. Patel’s overall assessment indicated the
    following:
    3
    The Division asked Dr. Patel for information on whether “the current right hip treatment is related to the
    original work injury” in April of 2007. The record is unclear on whether Dr. Patel provided this
    information, but the Division did not object to paying for Mr. Little’s medical treatment at that time.
    4
    [O]steoarthritis in both hips more on right than left now has
    muscle wasting and weakness of the right leg leading to
    decreased ambulation and drags his right leg when walking[.]
    I think the hip has been damaged from his compensation for
    his back pain over the years and he had some injury at the
    time of accident to the hip . . . . [H]e will check with
    Worker’s Comp possible surgery that he might need for right
    hip replaced.
    Dr. Patel also advised Mr. Little to see an orthopedic surgeon about a hip replacement.4
    [¶18] Mr. Little saw Dr. Patel again on September 14, 2010. Dr. Patel noted continued
    overcompensation and severe osteoarthritis, and again recommended a total hip
    replacement. Dr. Patel billed the Division $87.00 for the visit, but the Division denied
    payment, evidently anticipating a much larger claim for the hip replacement and perhaps
    an argument that by paying this small bill it had found Mr. Little’s need for a hip
    replacement to be related to his compensable injury years before. It issued a final
    determination stating that “[t]he bilateral hip osteoarthritis is not related to the originial
    [sic] work injury.” Mr. Little requested a contested case hearing, and the matter was
    referred to an OAH hearing examiner.
    [¶19] In February 2011, orthopedic surgeon Richard E. Torkelson performed an
    independent medical evaluation at the Division’s request. Dr. Torkelson reviewed Mr.
    Little’s medical records and radiographic studies. He also conducted a physical
    examination which included the taking of a history, a neurovascular exam of the lower
    extremities, and range of motion testing of the lower extremities. He ultimately
    concluded that Mr. Little’s right hip problems were unrelated to the original work injury:
    The diagnosis is severe degenerative arthritis, bilateral hips,
    right greater than left. My recommended treatment plan
    would be total hip arthroplasty5 starting on the right side.
    With regard to the specific questions posed;
    1. The bilateral hip care and treatment/interventions are not
    related to the original work injury of 1988. My reasoning for
    coming to this conclusion is that in my review of the
    4
    The Division objected to payment for this visit, stating that this treatment was unrelated to the original
    work injury. It later withdrew its objection but reserved its right to dispute further claims. Both parties
    agreed at the contested case hearing that the Division’s payment for earlier visits would not have a
    preclusive effect on later claims.
    5
    Hip replacement. See Stedman’s Medical Dictionary 150 (2000).
    5
    exhaustive records provided by your office, he saw multiple
    physicians including several orthopedic surgeons, as well as
    neurosurgeons in the period from 1988 forward and hip
    osteoarthritis was not diagnosed until January of 2007, 19
    years later. The note from Gillette Internal Medicine
    Associates [Dr. Patel] dated July 29, 2007, indicates that the
    patient told the examiner that he began experiencing pain in
    the right hip three months prior to the January 29, 2007 visit.
    The patient advised me that he had had pain in both lower
    extremities and this is well documented, but the diagnosis
    during that period of time was not related to hip arthritis, but
    rather radiating pain from his lumbosacral injury. In
    summary, there is no evidence of diagnosis of
    osteoarthritis of his hips at any time during multiple
    physician visits from 1988 to 2007. It is my opinion, to a
    degree of medical probability, that the current
    osteoarthritis is completely unrelated to his injury.
    Osteoarthritis in a person of his age is not unusual in the
    absence of any injury.
    2. Utilizing the same reasoning, it is my opinion that the
    proposed right total hip arthroplasty is not directly related to
    the original work injury of 1988 and the left hip osteoarthritis
    is also not directly related to the original work injury of 1988.
    (Emphasis added.)
    [¶20] Dr. Patel was deposed shortly before the contested case hearing. He testified to
    his qualifications as a board-certified internist, and that he regularly deals with arthritis,
    sprains, strains, and chronic pain in adults. When he began seeing Mr. Little in 2003, he
    was unaware of any hip problems and only knew that Mr. Little had chronic pain. Mr.
    Little did not display any symptoms of hip pain during his first visit, but Dr. Patel
    testified that the osteoarthritis could have been in an early and less symptomatic stage at
    that time. Dr. Patel could not obtain any previous medical records, and he felt that the
    results of his initial examination did not warrant a more comprehensive workup.
    [¶21] Dr. Patel testified that he began treating Mr. Little for osteoarthritis of the right hip
    joint in 2007. He described osteoarthritis as “basically a wear-and-tear of the joint”
    which can be caused by normal aging over time, a specific injury to that joint, or
    overcompensation due to other injuries. However, he testified that “there is no specific
    test, no specific exam or no specific time to tell where this [osteoarthritis] came from or
    how it came. It’s a clinical diagnosis and a clinical impression.”
    6
    [¶22] Dr. Patel testified as follows about the cause of Mr. Little’s osteoarthritis:
    A. . . The patient had also developed significant
    osteoarthritis, probably because of over-compensation from
    his previous injuries. . . .
    . . .
    Q. . . . Does that remain your opinion today?
    A. . . . In my clinical judgment, yes, that is a possible
    outcome of his injuries. . . .
    .   .   .
    . . . I was not privy to his actual injury initially, what
    was done. So . . . whether he had initial injuries to the hip
    area, I don’t know.
    .   .   .
    But from my four, five years of seeing him, my
    impression was that, yeah, he was developing osteoarthritis
    and most commonly probably related to his other previous
    injuries and his ongoing problems.
    .   .   .
    So when you either put more weight on the right hip
    joint all of the time, or if you just stand in a certain way all the
    time, or if that caused the overuse leading it to osteoarthritis.
    Q. And based on your training and experience and with a
    reasonable degree of medical probability, is it your opinion
    that that’s what happened to Marshall?
    A. That’s what I think, yes.
    .   .   .
    Q. . . . [D]o you feel that Marshall’s current right hip
    treatment is related to his original work injury?
    7
    A. It possibly still is, because in this letter [the 2007 request
    for information from the Division] it says that he has some
    pain in the right leg since this accident . . . maybe those same
    symptoms have probably progressed.
    Q. And, again, your opinion as you’ve described earlier is that
    the symptoms that he’s having and the problems that he’s
    having in his right leg are probably related to his original work
    injury?
    A. Possibly.
    Q. Possibly?
    A. Yes.
    (Emphasis added.)
    [¶23] Cross-examination by the Division’s attorney established that Mr. Little was obese
    and that he smoked cigarettes. Dr. Patel testified that he was unfamiliar with any
    correlation or studies linking osteoarthritis to smoking or obesity. However, he
    acknowledged his limited expertise in this area: “[Y]ou can ask the orthopedist, because
    they do deal with the final outcome of whatever etiology is of the osteoarthritis and if
    needing a replacement or surgery, because we [internists] usually just treat the symptoms.
    We don’t intervene any surgery.” Dr. Patel also testified that “[i]t’s really difficult to put
    a timeline once you find arthritis,” and that an orthopedist could answer questions about
    the onset of hip arthritis due to prior injuries.
    [¶24] Mr. Little was the only witness who testified in person at the contested case
    hearing. He indicated that before his 1988 injury he was physically active and had no hip
    pain. He immediately felt pain to his lower back and down through his legs after being
    drawn into the hot mix plant chute. He testified that he had hip pain soon after the
    accident, but that he assumed that physical therapy would help. He also “walk[ed]
    weird,” favoring his right leg, and he fell down several times before his first back
    surgery.
    [¶25] Mr. Little testified that he actually had two surgeries to his back and one to his
    neck in the late 1980s and early 1990s. He acknowledged that his back surgeries relieved
    his leg pain and weakness. He used a cane after his first surgery, but he eventually felt
    better and became more mobile from 1991 through 2001. He still walked with a limp and
    favored his right leg during this period. However, from 1992 through 1995, he “could
    almost get a normal stride,” and only used his cane as a stabilizer during the winter
    8
    months. Mr. Little also testified that he did not see any doctors about his injury from
    1990 through 1997.
    [¶26] Mr. Little began seeing Dr. Patel for pain management in 2003. He acknowledged
    that he had not been diagnosed with osteoarthritis in his hip before 2007. However, he
    claimed that he had hip pain well before 2007. He saw Dr. Patel for hip pain because
    “the pain . . . was becoming more than I could deal with.”
    [¶27] The hearing examiner issued a written order denying benefits for treatment of hip
    osteoarthritis, concluding as follows:
    [I]t is the Claimant’s contention that he either sustained an
    initial injury to his hip and, as a result, developed
    osteoarthritis in his hip requiring hip replacement surgery or,
    in the alternative, the Claimant contends that the osteoarthritis
    developed as a result of a change in gait due to his lower back
    injury and, therefore, he sustained a second compensable
    injury. As to the contention that the Claimant sustained an
    injury to his hip in 1988, the medical records do not support
    such a contention [reference to several medical records]. . . .
    The Office finds that this evidence does not indicate that the
    Claimant sustained any specific injury to his hip in 1988 and
    that the degenerative osteoarthritis developed over time for
    some other reason. The question then becomes whether the
    Claimant’s degenerative osteoarthritis which occurred over a
    substantial period of time was as a result of his initial work-
    related injury. As an injury which occurs over of a
    substantial period of time, it is the Claimant’s burden to prove
    by competent medical authority that his degenerative
    condition was directly as a result of his initial compensable
    injury. The Claimant contends that he has met such burden
    through the testimony of Dr. Patel. . . . In his deposition, Dr.
    Patel acknowledges the contents of his medical records;
    however he is then specifically asked as to whether or not he
    felt the Claimant’s right hip treatment is related to his original
    work injury. He specifically responds, “It possibly still is,
    because in this letter it says that he has some pain in the right
    leg since this accident, and this was 2007; so it’s almost about
    four years, four-and-a-half years since that. And maybe those
    same symptoms have probably progressed.” Dr. Patel is
    again asked whether the Claimant’s symptoms and the
    problems he is having with his right leg are probably related
    to his original work injury. Again, his response, “Possibly.”
    9
    The Office finds that such testimony does not satisfy the
    Claimant’s burden of proof to show a causal relationship as
    required under the law, especially in view of the medical
    opinion provided by Dr. Torkelson. . . . [T]he Office must
    find Dr. Torkelson’s opinions more probative in this matter.
    The district court affirmed, and this appeal followed.
    STANDARD OF REVIEW
    [¶28] We review an agency’s findings of fact arising from a contested case hearing for
    substantial evidence:
    Substantial evidence is relevant evidence which a
    reasonable mind might accept in support of the agency’s
    conclusions. Findings of fact are supported by substantial
    evidence if, from the evidence in the record, this Court can
    discern a rational premise for the agency’s findings. When the
    hearing examiner determines that the burdened party failed to
    meet his burden of proof, we will decide whether there is
    substantial evidence to support the agency’s decision to reject
    the evidence offered by the burdened party by considering
    whether that conclusion was contrary to the overwhelming
    weight of the evidence in the record as a whole.
    Jacobs v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 
    2013 WY 62
    , ¶ 8, 
    301 P.3d 137
    , 141 (Wyo. 2013) (citations omitted); see also 
    Wyo. Stat. Ann. § 16-3-114
    (c)(ii)(E)
    (LexisNexis 2013); W.R.A.P. 12.09. We defer to the agency’s (or the hearing
    examiner’s) determination of witness credibility unless it is clearly contrary to the
    overwhelming weight of the evidence. Willey v. State ex rel. Wyo. Workers’ Safety &
    Comp. Div., 
    2012 WY 144
    , ¶ 20, 
    288 P.3d 418
    , 427 (Wyo. 2012) (quoting Beall v. Sky
    Blue Enters., 
    2012 WY 38
    , ¶ 28, 
    271 P.3d 1022
    , 1034 (Wyo. 2012)). We also accord “no
    special deference to the district court’s decision and . . . consider the case as if it came
    directly from the agency.” Decker v. State ex rel. Workers’ Safety & Comp. Div., 
    2013 WY 75
    , ¶ 7, 
    303 P.3d 1134
    , 1136 (Wyo. 2013) (quoting In re Jensen, 
    2001 WY 51
    , ¶ 9,
    
    24 P.3d 1133
    , 1136 (Wyo. 2001)).
    DISCUSSION
    [¶29] The Wyoming Worker’s Compensation Act (the Act) defines a compensable
    injury as one “arising out of and in the course of employment.” 
    Wyo. Stat. Ann. § 27-14
    -
    102(a)(xi) (LexisNexis 2013); Perry v. State ex rel. Wyo. Workers’ Safety & Comp. Div.,
    
    2006 WY 61
    , ¶ 12, 
    134 P.3d 1242
    , 1246 (Wyo. 2006). We explained long ago that the
    10
    “arising out of” language of § 102(a)(xi) requires there to be a “causal connection[,] . . . a
    nexus between the injury and some condition, activity, environment or requirement of the
    employment.” Matter of Willey, 
    571 P.2d 248
    , 250 (Wyo. 1977) (citation omitted); see
    also Shelest v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 
    2010 WY 3
    , ¶ 8, 
    222 P.3d 167
    , 170 (Wyo. 2010); 1 Arthur Larson & Lex K. Larson, Larson’s Workers’
    Compensation Law § 3.01 (2013). Consistent with this requirement, the Act excludes
    from coverage “[a]ny injury resulting primarily from the natural aging process or from
    the normal activities of day-to-day living, as established by medical evidence supported
    by objective findings.” § 27-14-102(a)(xi)(G); Shepherd of Valley Care Ctr. v. Fulmer,
    
    2012 WY 12
    , ¶ 33, 
    269 P.3d 432
    , 442 (Wyo. 2012).
    [¶30] A single work accident can give rise to more than one compensable injury. In re
    Kaczmarek, 
    2009 WY 110
    , ¶ 9, 
    215 P.3d 277
    , 281 (Wyo. 2009) (citation omitted). The
    second compensable injury rule allows recovery when “an initial compensable injury
    ripens into a condition requiring additional medical intervention.” 
    Id.
     (quoting Yenne–
    Tully v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 
    12 P.3d 170
    , 172 (Wyo.
    2000)). However, a subsequent injury or condition is compensable only if it is causally
    related to the initial compensable injury. Hoffman v. State ex rel. Wyo. Workers’ Safety
    & Comp. Div., 
    2012 WY 164
    , ¶ 9, 
    291 P.3d 297
    , 301 (Wyo. 2012) (quoting Rogers v.
    State ex rel. Wyo. Workers’ Safety & Comp. Div., 
    2012 WY 117
    , ¶ 14, 
    284 P.3d 815
    , 819
    (Wyo. 2012)); see also Ball v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 
    2010 WY 128
    , ¶ 25, 
    239 P.3d 621
    , 628 (Wyo. 2010) (“[T]he second compensable rule is a
    causation analysis . . . .”). We apply the second compensable injury rule in cases where
    the claimant’s injury “was precipitated by a single, identifiable incident,” and reject the
    application of Wyoming Statute § 27-14-603 (burden of proof for injuries occurring over
    a substantial period of time) in such cases. Yenne-Tully, 12 P.3d at 172.6
    [¶31] The hearing examiner had to decide whether the osteoarthritis in Mr. Little’s hip
    was causally related to the compensable injury he suffered in 1988. Mr. Little advanced
    two alternative but related theories of recovery. He contended that he either directly
    suffered a hip injury in the work accident, or that his osteoarthritis was a second
    compensable injury because it was caused by the need to compensate because of injury
    resulting from his original injury. The hearing examiner rejected both theories. He found
    6
    The hearing examiner actually cited to two different legal standards in his final order: the second
    compensable injury rule, and the higher burden of proof required under § 27-14-603 for an injury
    occurring over a substantial period of time. Mr. Little’s condition falls under the second compensable
    injury rule because there was “a definite triggering accident or event,” and § 27-14-603 was therefore
    inapplicable to this case. See Yenne-Tully, 12 P.3d at 172. However, the hearing examiner ultimately
    applied the correct legal standard when he held that the weight of the evidence failed to support a causal
    link between the hip condition and the original work injury. We therefore view any incidental
    misstatement of the law as harmless error. See W.R.A.P. 9.04 (reviewing court disregards any error,
    defect, irregularity or variance which does not affect substantial rights).
    11
    that the medical records did not support a direct theory of causation, and that Mr. Little
    failed to prove that the arthritis in his hip was caused by overcompensation.
    [¶32] Mr. Little argues that the hearing examiner’s application of the second
    compensable injury rule is contrary to the overwhelming weight of the evidence in the
    record.7 He contends that Dr. Patel’s testimony and his own medical history established a
    sufficient causal link between the original work injury and osteoarthritis caused by a
    change in gait and overcompensation. Mr. Little also claims that the hearing examiner
    improperly relied upon Dr. Torkelson’s opinion that the osteoarthritis in his hip was
    unrelated to the 1988 accident. He argues that the examiner should have relied on his
    treating physician’s testimony as to the causation of the hip condition rather than Dr.
    Torkelson’s report.
    [¶33] In a contested case hearing for worker’s compensation benefits, the claimant bears
    the burden of proving all of the essential elements of the claim by a preponderance of the
    evidence, including proof of a causal connection between a work-related incident and his
    injury. See, e.g., Jacobs, ¶ 11, 301 P.3d at 141 (citation omitted); Anastos v. Gen. Chem.
    Soda Ash, 
    2005 WY 122
    , ¶ 20, 
    120 P.3d 658
    , 666 (Wyo. 2005) (citation omitted); State
    ex rel. Wyo. Workers’ Safety & Comp. Div. v. Conner, 
    12 P.3d 707
    , 709 (Wyo. 2000)
    (citation omitted); 8 Larson, supra, § 130.06[3][b]. This is true whether a claimant is
    seeking recovery under a direct theory of causation or the second compensable injury
    rule. Hoffman, ¶ 9, 291 P.3d at 301. In order to receive benefits under the second
    compensable injury rule, Mr. Little therefore had to prove that his back injury caused or
    “ripened into” a hip condition requiring additional medical intervention. See id. at 302.
    [¶34] The burden of proof consists of two elements, the burden of production and the
    burden of persuasion. Bando v. Clure Bros. Furniture, 
    980 P.2d 323
    , 330 (Wyo. 1999); 1
    Christoper B. Mueller & Laird C. Kirkpatrick, Federal Evidence §§ 3:4, 3:5 (3d ed.
    2007). The burden of production is also known as “the burden of producing evidence or
    going forward with the evidence,” and it “involves the obligation of a party to present, at
    the appropriate time, evidence of sufficient substance on the issue involved to permit the
    fact finder to act upon it.” Joyner v. State, 
    2002 WY 174
    , ¶ 18, 58 P.3d. 331, 337 (Wyo.
    2002) (citation omitted); see also 1 Mueller and Kirkpatrick, supra, § 3:4. The burden of
    7
    Little does not challenge the hearing examiner’s finding that his hip was not directly injured in the
    workplace accident. We agree with the Division that we should not consider that aspect of the agency’s
    final order. See Ferrell v. Knighten, 
    2013 WY 37
    , ¶ 12, 
    298 P.3d 161
    , 163 (Wyo. 2013) (“Since Ultra
    failed in its opening brief to designate or argue the issue of the propriety of the holding by the district
    court that it contractually waived its right to seek judicial review of the arbitration award, the holding is
    uncontested.” (quoting Ultra Resources, Inc. v. McMurry Energy Co., 
    2004 WY 121
    , ¶ 13, 
    99 P.3d 959
    ,
    964 (Wyo. 2004))); State v. Campbell Cnty. School Dist., 
    2001 WY 90
    , ¶ 35, 
    32 P.3d 325
    , 333 (Wyo.
    2001) (“Under this court’s long-standing precedent, this court will not frame the issues for the litigants
    and will not consider issues not raised by them and not supported by cogent argument and authoritative
    citation.”).
    12
    persuasion is “the burden of persuading the trier of fact that the alleged fact is true.” 2
    McCormick on Evidence § 336, at 664 (7th ed. 2013); see also Dir., Office of Workers’
    Comp. Programs, Dep’t of Labor v. Greenwich Collieries, 
    512 U.S. 267
    , 268, 
    114 S. Ct. 2251
    , 2253, 
    129 L. Ed. 2d 221
     (1994); Hansen v. State, 
    904 P.2d 811
    , 823-24 (Wyo.
    1995); 1 Mueller and Kirkpatrick, supra, § 3:5.
    [¶35] A claimant produces sufficient evidence of causation to meet his burden of
    production when “the medical expert testifies that it is more probable than not that the
    work contributed in a material fashion to the precipitation, aggravation or acceleration of
    the injury.” Anastos, ¶ 20, 120 P.3d at 666 (quoting Hall v. State ex rel. Wyo. Workers
    Comp. Div., 
    2001 WY 136
    , ¶ 16, 
    37 P.3d 373
    , 378 (Wyo. 2001)). “Testimony by the
    medical expert to the effect that the injury ‘most likely,’ ‘contributed to,’ or ‘probably’ is
    the product of the workplace suffices under our established standard.” 
    Id.
    [¶36] Dr. Patel testified that Mr. Little “was developing osteoarthritis . . . most
    commonly probably related to his other previous injuries,” and that he “developed
    significant osteoarthritis, probably because of over-compensation from his previous
    injuries.” (Emphasis added.) Dr. Patel also testified that Mr. Little’s change in gait
    caused overuse of the right leg and osteoarthritis within a reasonable degree of medical
    probability, and that he believed the right hip had been damaged from compensation for
    back pain over the years. Dr. Patel’s notes from February 2008 likewise indicated that
    Mr. Little “developed significant osteoarthritis, probably because of overcompensation.”
    (Emphasis added.) Mr. Little therefore produced sufficient evidence of causation to meet
    the burden of going forward as to his claim for benefits under the second compensable
    injury rule.
    [¶37] Mr. Little also bore the burden of persuasion, i.e., the obligation to persuade the
    hearing examiner that his hip condition was in fact causally connected to his original
    back injury in the face of conflicting testimony. This can be a difficult burden to
    overcome in some instances:
    The finder of fact is not necessarily bound by the expert
    medical testimony. . . . I t i s t h e h e a r i n g e x a m i n e r ’s
    responsibility, as the trier of fact, to determine relevancy,
    assign probative value and ascribe the relevant weight given
    to medical testimony. The hearing examiner is also in the
    best position to judge the weight to be given to the medical
    evidence. The trier of fact may disregard an expert opinion if
    he finds the opinion unreasonable or not adequately supported
    by the facts upon which the opinion is based.
    In weighing the medical opinion testimony, the fact
    finder considers: (1) the opinion; (2) the reasons, if any, given
    13
    for it; (3) the strength of it; and (4) the qualifications and
    credibility of the witness or witnesses expressing it.
    Demonstrating evidentiary contradictions in the record does
    not establish the ruling was irrational, but we do examine
    conflicting evidence to determine if the agency reasonably
    could have made its finding and order based upon all of the
    evidence before it.
    Anastos, ¶ 20, 120 P.3d at 666 (citations omitted) (internal quotation marks omitted). See
    also Casper Iron & Metal, Inc. v. Unemp’t Ins. Comm’n, 
    845 P.2d 387
    , 393 (Wyo. 1993)
    (“[I]f the party with the burden of persuasion has not sustained it by a fair preponderance
    of the evidence—if the evidence is in equipoise or the opposing party’s preponderates—
    the party with the burden must fail.” (quoting 1 D. Louisell & C. Mueller, Federal
    Evidence § 66 (1977))).
    [¶38] The record contains conflicting evidence as to causation. Some conflict can be
    found within Dr. Patel’s deposition. As we have already observed, his testimony satisfied
    Mr. Little’s burden of producing evidence which could have supported a decision in his
    favor. However, as the hearing examiner pointed out, Dr. Patel weakened that opinion
    with the repeated use of qualifying language like “I think,” and “possibly.” Dr. Patel is
    an internist, meaning that he treats arthritic joints as part of his general practice, and he
    does not specialize in diagnosis and treatment of diseases, injury, or degeneration of the
    body’s skeletal system or perform surgery to correct these conditions, as orthopedic
    surgeons do.
    [¶39] On the other hand, Dr. Torkelson’s report indicates that there was no connection
    between the work injury and the arthritic hip joint. Dr. Torkelson is an orthopedic
    surgeon who specializes in treatment of musculo-skeletal problems and performs surgical
    procedures such as hip replacements. Dr. Patel acknowledged that an orthopedic surgeon
    would be better equipped to answer questions about the general timeline and risk factors
    involved with arthritis.      Dr. Torkelson’s report did just that, concluding that
    “[o]steoarthritis in a person of [Mr. Little’s] age is not unusual in the absence of any
    injury.” He also noted “no evidence of diagnosis of osteoarthritis of his hips at any time
    during multiple physician visits from 1988 to 2007.” The hearing examiner was entitled
    to believe Dr. Torkelson over Dr. Patel, because Dr. Patel was less qualified to testify
    about the onset of arthritis by his own admission, and because Dr. Patel diluted his
    testimony by the use of qualifying language.
    [¶40] The hearing examiner was also entitled to discount Mr. Little’s testimony that the
    onset of his hip condition was much earlier. The medical records indicate that he had
    complaints of right leg pain as early as December of 1988. However, these reports are
    undercut by repeated findings of exaggerated responses and symptom magnification.
    Also, as Dr. Torkelson pointed out, nearly twenty years transpired between the original
    14
    accident and the diagnosis of hip osteoarthritis. Substantial evidence supports the hearing
    examiner’s decision that Mr. Little failed to prove a causal link between his original work
    injury and the onset of the osteoarthritis in his hip.
    CONCLUSION
    [¶41] Mr. Little met his burden of producing competent evidence to demonstrate a
    causal link between his compensable work injury and the arthritis in his hip nearly twenty
    years later. However, he failed to carry the burden of persuasion because the hearing
    examiner chose to believe the report of an orthopedic surgeon, which found no causal
    link between the original injury and the arthritis in his hip. Substantial evidence supports
    the hearing examiner’s findings. Affirmed.
    15