After establishing the disability from the last injury, the ALJ ... then determines "the degree or percentage of employee's disability that is attributable to all injuries or conditions existing at the time the last injury was sustained...."
§ 287.220.1. Cases have repeatedly held the nature and extent of the preexisting disability is measured as of the date of the primary injury. See, i.e. Gassen v. Lienbengood,134 S.W.3d 75, 80 -81 (Mo.App. W.D. 2004), citing §287.220.1 and Carlson v. Plant Farm, 952 S.W.2d 369, 373 (Mo.App.1997)("In order to calculate Fund liability, the [fact finder] must determine the percentage of the disability that can be attributed solely to the preexisting condition at the time of the last injury.") [T]he claimant must establish that an actual or measurable disability existed at this time. Messex v. Sachs Elec. Co., 989 S.W.2d 206, 214 (Mo.App.1999); see also Tidwell v. Kloster Co., 8 S.W.3d 585, 589 (Mo.App. 1999)(" In order to compute the total disability compensation to which an employee is entitled from the Second Injury Fund, the Commission must determine not only the existence of a preexisting permanent partial disability, but also the degree or percentage of the employee's disability that is attributable solely to the preexisting condition at the time of the last injury.").
Thus, it is crucial to consider the nature and extent of Claimant's disability on April 7, 2005, not as of any subsequent time to the date of injury. The Second Injury Fund ... is not liable for the progression of a claimant's preexisting disability if such progression is not caused by the last work-related injury. Highley v. Von Weise Gear, S.W.3d__ (Mo.App. E.D. 2008) citing Garcia at 266 and Frazier v. Treasurer of Missouri as Custodian of Second Injury Fund, 869 S.W.2d 152, 155 (Mo.App.1993). Post-accident worsening of pre-existing disability preventing reasonable employment is not a compensable injury entitling a claimant to total disability benefits. Lingerfelt v. Elite Logistics, Inc., 2008 WL 1733721, 6 (Mo.App. S.D.2008), citing Elrod v. Treasurer of Missouri as Custodian of Second Injury Fund, 138 S.W.3d 714, 717 (Mo.banc 2004); Lawrence v. Joplin R-VIII School Dist., 834 S.W.2d 789, 793-94 (Mo.App.1992).
Claimant argues she has many preexisting disabilities, but concentrated her evidence on the right knee, body as a whole on account of several chronic conditions, and low back. In a workers' compensation case, the claimant carries the burden of proving all essential elements of the claim. Fischer v. Archdiocese of St. Louis-Cardinal Ritter Institute, 793 S.W.2d 195, 198 (Mo.App. E.D. 1990). Regarding her knee, Claimant presented medical records documenting her February 3, 1993 right knee surgery by Dr. Markinson and subsequent treatment, the opinion of Dr. Musich she suffers from permanent partial disability of 25 % of the right knee, and testimony her knees are aggravated with activity. I find the preexisting disability of the right knee as of April 7, 2005 was equal to 20 % of the right knee, and that such disability was serious enough to have constituted a hindrance or obstacle to employment. As for the multiple chronic conditions of which Claimant complains, including cardiovascular, cervical, breathing, and gastric problems, Dr. Musich provides no disability rating, and there is otherwise a paucity of evidence to establish the chronic conditions were physically or vocationally disabling. I find Claimant's chronic medical conditions, such as heart disease, high blood pressure, neck, and gastroesophageal disease, were not preexisting disabilities causing a hindrance or obstacle to employment as of April 7, 2005.
The issue of the preexisting permanent partial disability associated with Claimant's low back is more complicated because while Claimant had low back symptoms and treatment prior to her April 2005 shoulder injury, the condition of her back changed significantly after the work injury. Claimant's testimony, medical records, and the experts speak to the preexisting back disability. Claimant said she hurt her back in the 1980's, and had general aches and pains thereafter. Records reflect she had temporary work restrictions. She did not accurately recall the date her more recent problems started, but the records establish she complained of sciatica to her personal physician in March 2004, had complaints, treatment, and an abnormal MRI in late 2004, and on January 10, 2005, first saw Dr. Place, who diagnosed degenerative lumbar spondylolisthesis with stenosis. Although Dr. Place's records mention surgery as a potential treatment option in January and March, it was not until May 2005, after her work injury, that Dr. Place discussed the surgical options in detail. It is important to note Claimant had no permanent restrictions on account of her back on April 7, 2005.
After the work injury of April 2005, the surgery, and the recovery, Claimant returned to work for several months. In November, after feeling a pop, her back pain and symptoms were significantly aggravated, and a fusion surgery resulted in December 2005. Following back surgery, Claimant experiences pain, has lost the feeling in the left foot, and cannot bend, sit, stand or lay for long periods because of her back. By its very nature, the fusion surgery caused a reduction in Claimant's spinal motion. Her level of overall functioning has declined.
The expert medical evidence is not particularly helpful because it appears Dr. Musich did not answer the correct
question. In assigning 45\% PPD of the body for the low back, Dr. Musich appears to have improperly considered Claimant's back disability to all be preexisting - he did not opine as to the degree of disability on April 7, 2005. By taking into account the disability which arose after the work injury, Dr. Musich has given an invalid opinion for degree of disability. However, his opinion does show some degree of preexisting permanency.
Based on the substantial and competent evidence, including Claimant's testimony, medical records, and opinion evidence, I find the permanent partial disability to Claimant's low back on April 7, 2005 was equal to 25 % of the body as a whole due to her degenerative lumbar spondylolisthesis with stenosis.