Abstract: A tibial prosthetic implant includes a base or base plate with an offset tibial stem. The base includes an inferior surface adapted to abut a resected surface of a patient's tibia and forms a base for articulating surfaces adapted to articulate with the patient's femoral condyles. The longitudinal center axis of the tibial stem extends from the inferior surface of the base and is offset from a center of the base. The offset places the stem in position to extend into the central canal of the tibia so that it does not substantially interfere with the cortical bone when the inferior surface of the base substantially abuts and aligns with the resected surface of the tibia.

Abstract: A patella osteotomy guide comprising a plier-like appliance with curved jaws for grasping a patient's patella. A row of teeth faces inwardly from the jaws. The teeth are generally of pyramid shape, but a vertex of each tooth lies in a plane containing a bottom side of the respective jaw. Each of the jaws has an integral saw capture slot and the tips of the jaws are extended. A rotating, calibrated stylus measures the position of the patella with respect to the integral saw capture slots. The rotating stylus also functions as a pivot or fulcrum about which the jaws and handles of the osteotomy guide rotate. Handles for the osteotomy guide are offset from the plane of the jaws. The rotating stylus can be displaced up and down and then locked into a selected position using a draw bar and captured balls. A bowed retaining ring imparts a certain amount of pre-load to the stylus and draw bar assembly to hold the assembly in a selected position.