Under Missouri Workers' Compensation law, the claimant bears the burden of proving all essential elements of his or her workers' compensation claim. ${ }^{23}$ Proof is made only by competent and substantial evidence, and may not rest on speculation. ${ }^{24}$ Medical causation not within lay understanding or experience requires expert medical evidence. ${ }^{25}$ When medical theories conflict, deciding which to accept is an issue reserved for the determination of the fact finder. ${ }^{26}$
In addition, the fact finder may accept only part of the testimony of a medical expert and reject the remainder of it. ${ }^{27}$ Where there are conflicting medical opinions, the fact finder may reject all or part of one party's expert testimony that it does not consider credible and accept as true the contrary testimony given by the other litigant's expert. ${ }^{28}
The fact finder is encumbered with determining the credibility of witnesses. { }^{29} It is free to disregard that testimony which it does not hold credible. { }^{30}$
The word "accident" as used by the Missouri workers' compensation law means "an unexpected traumatic event or unusual strain identifiable by time and place of occurrence and producing at the time objective symptoms of injury caused by a specific event during a single work shift. An injury is not compensable because work was a triggering or precipitating factor." ${ }^{31}$
An "injury" is defined to be "an injury which has arisen out of and in the course of employment. An injury by accident is compensable only if the accident was the prevailing factor in causing both the resulting medical condition and disability. The "prevailing factor" is defined to be the primary factor, in relation to any other factor, causing both the resulting medical
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[^0]: ${ }^{23}$ Fischer v. Archdiocese of St. Louis, 793 S.W.2d 195, 198 (Mo. App. W.D. 1990); Grime v. Altec Indus., 83 S.W.3d 581, 583 (Mo. App. 2002).
${ }^{24} Griggs v. A.B. Chance Company, 503 S.W.2d 697, 703 (Mo. App. W.D. 1974).
{ }^{25} Wright v. Sports Associated, Inc., 887 S.W.2d 596, 600 (Mo. banc 1994).
{ }^{26} Hawkins v. Emerson Elec. Co., 676 S.W.2d 872, 977 (Mo. App. 1984).
{ }^{27} Cole v. Best Motor Lines, 303 S.W.2d 170, 174 (Mo. App. 1957).
{ }^{28}$ Webber v. Chrysler Corp., 826 S.W.2d 51, 54 (Mo. App. 1992); Hutchinson v. Tri State Motor Transit Co., 721 S.W.2d 158, 163 (Mo. App. 1986).
${ }^{29}$ Cardwell v. Treasurer of the State of Missouri, 249 S.W.3d 902 (Mo.App. E.D. 2008).
${ }^{30} Id. at 908 .
{ }^{31}$ Section 287.020.3(1), RSMo. All statutory references are to the Revised Statutes of Missouri (RSMo), 2005, unless otherwise noted.
condition and disability." ${ }^{32}$ An injury shall be deemed to arise out of and in the course of employment only if it is readily apparent, upon consideration of all the circumstances, that the accident is the prevailing factor in causing the injury; and it does not come from a hazard or risk unrelated to the employment to which workers would have been equally exposed outside of and unrelated to the employment in normal non-employment life. ${ }^{33}$
Section 287.067.3 provides that 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 the disability. Occupational disease is defined by Missouri Revised Statute Section 287.067.1 as follows:
... an identifiable 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 to have been 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. ${ }^{34}$
The "prevailing factor" is defined to be the primary factor, in relation to any other factor, causing both the resulting medical condition and disability." ${ }^{35}$ An injury shall be deemed to arise out of and in the course of employment only if it is readily apparent, upon consideration of all the circumstances, that the accident is the prevailing factor in causing the injury; and it does not come from a hazard or risk unrelated to the employment to which workers would have been equally exposed outside of and unrelated to the employment in normal non-employment life
In this case, Claimant requests a Temporary Award be issued and that the Award order the employer/insurer to provide him with medical treatment and temporary disability benefits. The employer/insurer has denied that there was a compensable work incident and has provided no medical treatment - not even an evaluation.
In his brief, Claimant argues that he either suffered an accident or that he may have an occupational disease; either way, he contends that he suffered a twinge and strain that occurred while performing the ordinary duties of his job. He further argues that the Division of Workers' Compensation can determine that this event is compensable even without the benefit of expert testimony, particularly since the employer/insurer refused to refer Claimant to a physician and Claimant did not have the resources to pay for such care himself. Claimant argues that while some occupational diseases require expert testimony, it may not be required in this case where he allegedly suffered a strain while hooking and unhooking a tractor trailer. Claimant, relying on the case of Bock v. City of Columbia, argues that his testimony is sufficient to establish
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[^0]: ${ }^{32} Section 287.020.3(1), RSMo.
{ }^{33} Section 287.020.3(c), RSMo.
{ }^{34} Section 287.067.1, RSMo.
{ }^{35} Section 287.020.3(1), RSMo
causation. { }^{36}$
In Bock, the employee suffered a wound to his shin when a metal pipe fell from above, bounced off the floor, and hit the employee in his shin; the employee suffered significant bruising and inflammation. The court in that case held that the "initial injury is not sophisticated, nor did it require surgery or technical, scientific diagnosis. It is therefore within lay understanding and its effect on the disability is within the expertise of the Commission."37 Claimant argues that following Bock, his testimony - that he used his left arm to hook and unhook the trailer, as he had done many times before, but that on this occasion he felt the twinge and strain - is sufficient to find that Claimant's injury is compensable.
The employer/insurer argues that Claimant has not met his burden of proof on the issues of whether Claimant suffered an accident or occupational disease arising out of and in the course of employment or medical causation. The employer/insurer notes that the court in Henley v. Fair Grove R-10 School District held that if Claimant is alleging an occupational disease, his medical expert "must establish the probability that the disease was caused by conditions in the work place, and there must be medical evidence of a direct causal connection between the conditions under which the work is performed and the occupational disease." ${ }^{38}$ The employer/insurer also relies on Vickers v. Missouri Dept of Public Safety, 283 S.W.3d 287 (Mo. App. W.D. 2009), in which the Missouri Western District Court of Appeals handed down a decision that stated that in order for a claimant to meet his or her burden, the claimant "had to submit medical evidence establishing a probability that working conditions caused the disease." ${ }^{39}$
The employer/insurer also relies upon a decision of the Labor and Industrial Relations Commission, Grant v Anheuser Busch, DOLIR 4-8-10. In that case the Commission affirmed an Award by the Administrative Law Judge whereby the ALJ denied benefits to an employee who alleged an occupational disease by way of repetitive trauma because the employee failed "to provide any expert medical opinions upon which to base a medical causation decision." ${ }^{40}$
In this case, Claimant is uncertain whether he sustained an injury by accident on or about October 18, 2013, or whether he sustained an occupational disease. Claimant is also uncertain what he did or could have done to cause an injury by accident or occupational disease to his left arm/shoulder, but he speculates that it may have happened when he was pulling on the fifth wheel of the tractor trailer or while he was raising or lowering the landing gear of the trailer. Claimant does not have a causation report and there is no expert medical opinion upon which to base a medical causation decision.
Based upon the facts adduced at trial, I find that Claimant has failed to meet his burden of proof regarding whether he sustained an injury by accident or occupational disease while in the course and scope of his employment. Claimant has also failed to meet his burden of proof that
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[^0]: ${ }^{36} 274.S.W.3d 555 (Mo. App. 2008).
{ }^{37} Id. At 563 .
{ }^{38}$ Henley v. Fair Grove R-10 School District, 253 S.W.3d 115 (Mo.App. S.D. 2008), citing Dawson v. Associated Electric, 885 S.W.2d 712, 716 (Mo.App. W.D. 1994).
${ }^{39}$ Vickers v. Missouri Dept of Public Safety, 283 S.W.3d 287 (Mo. App. W.D. 2009).
${ }^{40}$ Grant v Anheuser Busch, DOLIR 4-8-10.
any injury was medically, causally related to the alleged work accident or occupational disease. This case is not analogous to the situation in Bock, where a pipe fell and struck an employee, causing an immediately identifiable injury. Instead, in this case, Claimant speculates as to what may or may not have caused his injury - pulling on a fifth wheel or raising and lowering landing gear - but he is not certain what caused his injury. Moreover, Claimant did not feel immediate pain or injury while engaging in either of those activities. Instead, he felt pain at least 30 minutes later, after he was driving the load to its delivery location. In hindsight, he speculates that he may have suffered an accident or an occupational disease while engaging in the activities of pulling on the fifth wheel or raising and lowering the landing gear - noting that he cannot think of anything else he could have done to injure himself. In addition, Claimant has provided no expert medical testimony establishing that his injury is medically causally related to any work incident or occupational disease. Claimant's Claim for Compensation fails.
I further find that it is appropriate to issue this Award as a final Award rather than as a temporary Award.