Permanent Total Disability [T]he term "total disability" is "defined as the inability to return to any employment and not merely the
inability to return to the employment in which the employee was engaged at the time of the accident." Sullivan v. Masters Jackson Paving Co., 35 S.W.3d 879, 884 (Mo. App. 2001); § 287.020.7. "It does not require that the claimant be completely inactive or inert." Sifferman v. Sears Roebuck and Co., 906 S.W.2d 823, 826 (Mo. App. 1995); see also Brookman v. Henry Transp., 924 S.W.2d 286, 290 (Mo.App. 1996); Reiner v. Treasurer, State of Missouri, 837 S.W.2d 363, 367 (Mo.App. 1992).
"'To determine if claimant is totally disabled, the central question is whether, in the ordinary course of business, any employer would reasonably be expected to hire claimant in his present physical condition." Ransburg v. Great Plains Drilling, 22 S.W.3d 726, 732 (Mo. App. 2000); see also Massey v. Missouri Butcher \& Cafe Supply, 890 S.W.2d 761, 763 (Mo. App. 1995).
"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.'" Eimer v. Bd. of Police Comm'rs, 895 S.W.2d 117, 120 (Mo.App. 1995); Ransburg, 22 S.W.3d at 732.
Pavia v. Smitty's Supermarket, 118 S.W.3d 228, 234 (Mo. App. 2003).
[T]he Commission does not have to make its decision only upon testimony from physicians; it can make its findings based on the entire evidence. Smith, 32 S.W.3d at 573; see Eimer, 895 S.W.2d at 120. "In determining the percentage of disability, the Commission is not bound by the percentage estimates of medical experts and it may consider all of the evidence, including the testimony of the employee and all reasonable inferences." Eimer, 895 S.W.2d at 120.
Pavia, 118 S.W.3d at 239[1], citing Smith v. Richardson Bros. Roofing, 32 S.W.3d 568 (Mo. App. 2000).