Abstract

There is increasing awareness of the need to include patient-reported outcome (PRO) instruments in evaluatingthe measurement of clinical outcomes, withan increasing focus placed on the patients#x2019;perspective.Scientists have tried to link PROs with objective outcomes, providing unique information formanaging patient care. Traditionally, objective and patient-reportedoutcomes (such as the Knee Injury and Osteoarthritis OutcomeScore (KOOS)) are considered two distinct constructs, which cannotserve as a direct proxy for each other. Gibson#xB4;s affordances are properties taken with reference to the patient. They are neither objective nor subjective.The present article develops a theoretical framework called entrainment of touch and posturethat advocates the vis viva (living force) as the proper gauge for the dynamical action of a force, and that could explain #x201C;possibilities for action or affordance#x201D; during outcome measurement.