Abstract: A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a screw to an estimated placement point on the femur with a strand attached to the screw and extending away therefrom. The device comprises a holder, a driver disposed in the holder to engage and drive the screw into the femur, a fitting for positioning the holder to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand, and means for attaching the gauge to the holder. The gauge comprises an excursion scale to indicate the movement of the strand when the knee is flexed, a spring for applying a selected tension to the strand, and a gripper for the strand.

Abstract: The present invention relates to a knee brace which includes an upper and lower cuff which are attached at the medial and lateral sides of the knee joint by freecentric locking hinges. The freecentric hinge includes a free floating center of rotation which allows simultaneous translation and rotation of the upper hinge arm relative to the lower hinge arm. The freecentric hinge may further include a locking mechanism which comprises a pin located on the upper hinge arm and a hook located on the lower hinge arm which may be forced into engagement to prevent further rotation of the hinge when it is desired to prevent hyperextension of the user's knee. A pair of tension straps may be attached across the back of the user's knee from the upper cuff to the lower cuff, and adjusted in its length so that extension of the knee tends to generate tension in the strap which aids in pulling the upper and lower cuff members to be pulled towards each other.