Upon careful review of the entire record, including the testimony, as well as the medical records offered and admitted into evidence, the Commission determines and concludes that employee failed to prove the nature and extent of his permanent partial disability, solely attributable to the work-related injury.
Employee bears the burden of proving all material elements of his claim. Pavia v. Smitty's Supermarket, 118 S.W.3d 228, 241 (Mo.App S.D. 2003). "The testimony of . . . lay witnesses as to facts within the realm of lay understanding can constitute substantial evidence of the nature, cause, and extent of the disability, especially when taken in connection with, or where supported by, some medical evidence." Id at 234. The employee must prove the nature and extent of any disability by a reasonable degree of certainty. Moriarty v. Treasurer of Mo., 141 S.W.3d 69, 73 (Mo.App E.D. 2004). The proof of disability must be based on competent and substantial evidence and not merely on speculation. Id. Employee is barred from recovering permanent partial disability benefits if employee fails to offer expert testimony regarding the percentage of disability derived from the compensable injury. Id.
The administrative law judge found:
This case is different from most in that there are no estimates of disability from physicians in this case. It is obvious from the medical records and from a visual inspection that Claimant sustained a large and serious abrasion to his right lower leg, that he had a stormy recovery course with infection and re-infection, that the wound is indented, quite discolored, and that the skin is thinner. Claimant's complaints of muscle aches and soreness are, of course, subjective, but it is quite obvious from the visual inspection that some degree of continued and permanent discomfort is to be expected.
Also considering the nature of Claimant's work, some continuing disability is expected.
The administrative law judge went on to conclude that claimant sustained a permanent partial disability of 7.5 % of the right lower extremity at the 155 week level.
In a workers' compensation case, employee must establish all elements of his claim, including the nature
and extent of his disability; which employee has clearly failed to do in this case. Employee chose not to offer any expert testimony regarding the degree of disability attributable to his work injury. It is a well established fact that medical expert testimony is required in order to establish the percentage of disability, if any, attributable to the work injury.
In the case at hand, as noted by the administrative law judge, no medical expert testimony was offered regarding the percentage of employee's permanent partial disability solely attributable to the work-related injury. In addition, since there were subsequent non work-related injuries to the same area necessitating additional medical care and treatment, it was incumbent on employee to prove the nature and extent of permanent partial disability attributable to the work-related injury, separating the disability from the subsequent injuries by expert testimony; employee's failure to do so bars recover of permanent partial disability. Plaster v. Dayco, 760 S.W.2d 911, 913 (Mo.App. S.D. 1988) and Goleman v. MCI Transporters, 844 S.W.2d 463, 466 (Mo.App. W.D. 1992), overruled on other grounds, Hampton v. Big Boy Steel Erection, 121 S.W.3d 220 (Mo. banc 2003).
Furthermore, an expert opinion is necessary when the injury is beyond lay understanding. Id. However, employee relies on his lay witness testimony to support his claim when it is apparent that the injury is beyond lay understanding. While employee's testimony could have been used to support medical expert testimony to determine the degree of disability; it cannot solely be relied upon as the basis for determining the nature and extent of his disability. Consequently, it is impossible for employee to have proven the nature and extent of his disability.
The administrative law judge's award is based upon employee's subjective complaints as well as the administrative law judge's own observations of the employee's right leg at trial, some two years after the injury and without consideration of subsequent non-work-related injuries to the same area. This is purely speculative and is not a sufficient basis upon which to render a determination with regard to the percentage of permanent partial disability. The administrative law judge's award of permanent partial disability is not supported by competent and substantial evidence and must be reversed.