Abstract: The spaced beam and bearing arrangements each comprise a deflection beam and a support. The platform is disposed on and supported by the support for receiving and being deflected by an applied force. Thus, deflection of the platform is transmitted to the deflection beams to cause deflection of the deflection beams. The beam and bearing arrangements isolate beam deflections to two mutually perpendicular directions, which mutually perpendicular directions are both perpendicular to the longitudinal axis of each deflection beam. The deflection of the deflection beams is measured in the two directions thereof and the deflection beams are arranged such that no two redundant directions of the deflection beams are permissible.

Abstract: The invention relates to a knee laxity evaluator which consists of an instrumented seat, a restraint means for restraining the thigh of a patient to the instrumented seat, a motion module for measuring motion of the unrestrained part of the leg relative to the thigh of the patient, and processor means for analyzing outputs of the instrumented seat and the motion module to provide indications of applied force and relative motion. The invention also relates to a specific motion module/digitizer combination which can be used as a part of the knee laxity evaluator, or which can be used independently or in alternate systems. The invention also relates to a novel dynanometer for use in the knee laxity evaluator which includes a triple beam arrangement.