"even if medical evidence establishes that a claimant's different injuries have different dates of maximum medical recovery, the legally significant date--the date of maximum medical improvement for purposes of ending a workers' compensation claimant's temporary disability--is the date upon which the claimant has attained maximum medical recovery from all of the injuries sustained in a particular compensable accident. "the court adds on a puzzling dictum however when it notes that an injured worker may have suffered one injury that will render him permanently disabled while other components of his injury may not have reached the MMI point.
" We recognize that there may be circumstances in which a claimant's permanent disability may be ascertainable even though not all of the claimant's injuries have reached maximum medical healing. For instance, where it is apparent that one injury of multiple injuries has reached maximum medical healing and will render a claimant permanently and totally disabled, it may be possible to award permanent total disability benefits even before the claimant reaches maximum medical healing with respect to all the injuries resulting from an accident. See, e.g., State, ex rel. Galion Mfg., v. Haygood, 60 Ohio St. 3d 38, 573 N.E.2d 60 (1991). "