After giving careful consideration to the entire record, based upon the above testimony, the competent and substantial evidence presented, Claimant's demeanor during the hearing, and the applicable law of the State of Missouri, I find Claimant did not meet her burden to show her work activities were the prevailing factor that caused her right knee injury for the reasons stated below.
Claimant asserts she developed right knee problems from repetitively climbing a ladder at work for several weeks. SIF contends Claimant's work activities were not the prevailing factor that caused her medical condition.
Despite the statutory changes, the basic burden of proof is constant. Claimant must establish, generally through expert testimony, the probability that the claimed occupational disease was caused by conditions in the work place. Selby v. Trans World Airlines, Inc., 831 S.W.2d 221, 223 (Mo. App. 1992). ${ }^{3}$ Claimant must prove "a direct causal connection between the conditions under which the work is performed and the occupational disease." Webber v. Chrysler Corp., 826 S.W.2d 51, 54 (Mo. App. 1992).
Where the opinions of medical experts are in conflict, the fact finding body determines whose opinion is the most credible. Hawkins v. Emerson Electric Co., 676 S.W.2d 872, 877 (Mo. App. 1984). Where there are conflicting medical opinions, the fact finder may reject all or part of one party's expert testimony which it does not consider credible and accept as true the contrary testimony given by the other litigant's expert. George v. Shop ' N Save Warehouse Foods Inc., 855 S.W.2d 460, 462 (Mo. App. 1993)
A claimant has the burden to prove all elements of his claim to a reasonable probability. Cardwell v. Treasurer of State of Missouri, 249 S.W.3d 902, 911 (Mo.App. 2008). Section 287.808 requires claimants to establish the proposition is more likely to be true than not true. Section 287.067 provides:
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[^0]: ${ }^{3}$ Overruled on other grounds by Hampton v. Big Boy Steel Erection, 121 S.W.3d 220, 230 (Mo. banc 2003). No further reference will be made in this award to the Hampton case.
- An "occupational disease" is a disease arising with or without human fault out of and in the course of the employment. Ordinary diseases of life to which the general public is exposed outside of the employment shall not be compensable, except where the diseases follow as an incident of an occupational disease as defined in this section. The disease need not be foreseen or expected but after its contraction it must appear to have had its origin in a risk connected with the employment and to have flowed from that source as a rational consequence.
- An occupational disease due to repetitive motion is compensable only if the occupational exposure was the prevailing factor in causing both the resulting medical condition and disability. The prevailing factor is defined as the primary factor, in relation to any other, causing both the medical condition and disability.
I find Dr. Cantrell's causation opinion is more credible than Dr. Poetz's opinion. Dr. Cantrell concluded Claimant's right knee lateral patellar tilt (subluxation) was not caused by overuse. Dr. Cantrell explained lateral patellar tilt is commonly caused by weakness in the vastus medialia, tight IT band, or the increased Q angle in women due to a wide pelvis, and is found in runners. However, patellar tilt is not the exclusive domain of runners, who experience many knee problems. Moreover, overuse does not cause these conditions, but if present, may cause symptoms. Claimant did not provide a history of knee buckling and Dr. Cantrell was not asked about it.
In addition, Dr. Cantrell noted symptom magnification because Claimant's clinical examination was inconsistent with patellar tilt. She reported tenderness on the patella, medial and lateral joint lines, and "ratchet muscle weakness," which Dr. Cantrell testified were not typically associated with patellar tilt. Also, x-rays taken at Grace Hill a short time after the date of injury reveal no subluxation.
On the other hand, Dr. Poetz's opinion is not credible that the buckling of Claimant's right knee affected ligamentous support and caused abnormal tracking. Also, Dr. Poetz did not explain why x-rays show bilateral patellar tilt when Claimant did not report a left knee buckle and Dr. Kieffer has recommended the same surgery for the left knee. ${ }^{4}$
Also, Dr. Poetz's opinion is not credible that repetitive climbing caused a left knee sprain. As stated above, Dr. Cantrell read x-rays to show bilateral patellar tilt.
Claimant's testimony is not credible that her right knee buckled while descending the ladder and Dr. Poetz acknowledged the medical records he reviewed contained no history that Claimant's right knee buckled on the alleged date of injury. Also, she gave contradictory histories of knee problems between February 2007 and March 2007 when her assignment was changed. She testified the pain and swelling remained the same, and later testified it increased.
Based on credible testimony by Dr. Cantrell, medical records and reports, and less than credible testimony by Dr. Poetz and Claimant, I find Claimant did not prove that climbing the ladder or buckling caused right knee patellar tilt and the need for surgery.
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[^0]: ${ }^{4}$ Dr. Kieffer's recommendation is not in evidence but Mr. Hoener questioned Dr. Cantrell about the recommendation during deposition.
Having found Claimant's work activities were not the prevailing factor that caused patellar tilt and the need for surgery, all other issues are moot.