First of all, it is important to note that employee's alleged accidental injury occurred on July 5, 2006. Therefore, this case falls under the purview of the 2005 amendments to Missouri Workers' Compensation Law.
Section 287.120 RSMo Supp. (2006) ${ }^{1}$ "requires employers to furnish compensation according to the provisions of the Workers' Compensation Law for personal injuries of
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[^0]: ${ }^{1}$ Unless otherwise indicated, all statutory references are to RSMo. Supp. (2006).
employees caused by accidents arising out of and in the course of the employee's employment." Gordon v. City of Ellisville, 268 S.W.3d 454, 458-59 (Mo. App. 2008).
Section 287.020.2 RSMo defines "accident" as: "An unexpected traumatic event or unusual strain identifiable by time and place of occurrence and producing at the time objective symptoms of an injury caused by a specific event during a single work shift." Pursuant to section 287.020.3 RSMo, an "injury" is defined to be "an injury which has arisen out of and in the course of employment." Section 287.020.3 RSMo further states that:
"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."
The administrative law judge found Dr. Levy to be more credible than Dr. Doll, but did not provide any rationale for said conclusion. Further, the administrative law judge, in awarding benefits, did not appear to focus on the primary issue in the case: Did employee satisfy her burden of proof that the July 5, 2006, work fall is the prevailing factor in causing her permanent partial disability to her back and knees? Although the administrative law judge used the language "prevailing factor" in his award, it appears that he and Dr. Levy actually viewed the work fall as an aggravation. Employee even argues in her brief that the work fall increased employee's permanent partial disability. Employee does not properly argue that the work fall was the "prevailing factor in causing both the resulting medical condition and disability."
Under current Missouri Workers' Compensation Law, "in order for an event that arises out of and in the course of one's employment to entitle an employee who has a prior disability to additional benefits, the event must be a prevailing factor that results in further disability. It is not sufficient that the event simply aggravates a preexisting condition." Johnson v. Ind. Western Express, Inc., 281 S.W.3d 885, 893 (Mo. Ct. App. 2009), citing Gordon, 268 S.W.3d at 459.
As stated above, employee had an extensive medical history with regard to her back and both knees prior to the work fall. Although employee received some physical therapy from Concentra for her back shortly after the fall, she was released shortly thereafter without ever receiving any physical therapy or other treatment for her knees. In fact, seven weeks after the fall, when employee treated with her primary care physician with complaints of back and bilateral knee pain, she did not even mention the work fall as a cause of her pain complaints.
The fact that employee's prior history of back and bilateral knee problems is so extensive, including a diagnosis of degenerative disc disease and stenosis to her back, and a total knee replacement and a diagnosis of arthritis in her knees, we find Dr. Doll's opinion that the work injury was not the prevailing factor in the cause of her permanent partial disability to her back and knees more credible than Dr. Levy's. Dr. Levy did not