Under Missouri Workers' Compensation law, the claimant bears the burden of proving all essential elements of his or her workers' compensation claim. ${ }^{12}$ Proof is made only by competent and substantial evidence, and may not rest on speculation. ${ }^{13}$ Medical causation not within lay understanding or experience requires expert medical evidence. ${ }^{14}$ When medical theories conflict, deciding which to accept is an issue reserved for the determination of the fact finder. ${ }^{15}$
In addition, the fact finder may accept only part of the testimony of a medical expert and reject the remainder of it. ${ }^{16}$ 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. ${ }^{17}
The fact finder is encumbered with determining the credibility of witnesses. { }^{18} It is free to disregard that testimony which it does not hold credible. { }^{19}$
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
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[^0]: ${ }^{11} 17 S.W.3d 124, 126 (Mo.App. W.D. 1999).
{ }^{12}$ 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).
${ }^{13} Griggs v. A.B. Chance Company, 503 S.W.2d 697, 703 (Mo. App. W.D. 1974).
{ }^{14} Wright v. Sports Associated, Inc., 887 S.W.2d 596, 600 (Mo. banc 1994).
{ }^{15} Hawkins v. Emerson Elec. Co., 676 S.W.2d 872, 977 (Mo. App. 1984).
{ }^{16} Cole v. Best Motor Lines, 303 S.W.2d 170, 174 (Mo. App. 1957).
{ }^{17}$ 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).
${ }^{18}$ Cardwell v. Treasurer of the State of Missouri, 249 S.W.3d 902 (Mo.App. E.D. 2008).
${ }^{19}$ Id. at 908 .
work shift. An injury is not compensable because work was a triggering or precipitating factor." ${ }^{20}$
An "injury" is defined to be "an injury which has arisen out of an 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 condition and disability." ${ }^{21}$ 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. ${ }^{22}$
The determination of the specific amount or percentage of disability to be awarded to an injured employee is a finding of fact within the unique province of the ALJ. ${ }^{23}$ The ALJ has discretion as to the amount of the permanent partial disability to be awarded and how it is to be calculated. ${ }^{24}$ A determination of the percentage of disability arising from a work-related injury is to be made from the evidence as a whole. ${ }^{25}$ It is the duty of the ALJ to weigh the medical evidence, as well as all other testimony and evidence, in reaching his or her own conclusion as to the percentage of disability sustained. ${ }^{26}$
Medical care is addressed in subsection 1 of RSMo Section 287.140, which states, in pertinent part, as follows:
In addition to all other compensation paid to the employee under this section, the employee shall receive and the employer shall provide such medical, surgical, chiropractic, and hospital treatment, including nursing, custodial, ambulance and medicines, as may reasonably be required after the injury or disability to cure and relieve from the effects of the injury.
As for future medical case, the employee need only show that he is likely to need additional treatment "as may reasonably be required . . . to cure and relieve . . . the effects of the injury . . . that flow from the accident [or disease]." ${ }^{27}$ This has been interpreted to mean that an employee is entitled to compensation for care and treatment that gives comfort, i.e., relieves the employee's work-related injury, even though a cure or restoration to soundness is not possible, if the employee establishes a reasonable probability that he or she needs additional future medical
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[^0]: ${ }^{20}$ Section 287.020.3(1), RSMo. All statutory references are to the Revised Statutes of Missouri (RSMo), 2005, unless otherwise noted.
${ }^{21} Section 287.020.3(1).
{ }^{22} Section 287.020.3(c).
{ }^{23}$ Hawthorne v. Lester E. Cox Medical Center, 165 S.W.2d 587, 594-595 (Mo.App. S.D. 2005); Sifferman v. Sears \& Robuck, 906 S.W.2d 823, 826 (Mo.App. S.D. 1999).
${ }^{24} Rana v. Land Star TLC, 46 S.W.3d 614626 (Mo.App. W.D. 2001).
{ }^{25} Landers v. Chrysler, 963 S.W.2d 275, 284 (Mo.App. E.D. 1998).
{ }^{26} Rana at 626 .
{ }^{27}$ Sullivan v. Masters and Jackson Paving, 35 S.W.2d 879, 888 (Mo.App. 2001).
care. ${ }^{28}$ "Probable" means founded on reason and experience that inclines the mind to believe but leaves room for doubt. ${ }^{29}$ Claimant need not show evidence of the specific nature of the treatment required, but only that treatment is going to be required. ${ }^{30}$
Claimant testified credibly that on March 28, 2003, she injured her left hand in an accident at work when she was moving two tables. As a result of that accident, she has also developed hand and elbow problems. Claimant continues to have significant symptoms and pain in her left hand and elbow. Claimant wishes to receive additional medical treatment such as recommended by Dr. Schlafly. Dr. Schlafly testified credibly and convincingly that work was the substantial factor in causing claimant's left hand and elbow injury and in the need for future medical treatment. Dr. Schlafly's opinion is thorough and well-reasoned.
I find that claimant has proven by substantial and competent evidence that her left hand and elbow injury arose out of and in the course and scope of employment with the employer. I also find that work was the substantial factor causing claimant's left hand and elbow injury. I find that claimant sustained a permanent partial disability of 25 % of the left arm at the level of the elbow (encompassing both the injury to the elbow and to the hand). In addition, claimant has met her burden of proof regarding her need for additional medical treatment; the employer/insurer is ordered to provide additional medical care such as what is recommended by Dr. Schlafly.