Abstract: A telemetric tibial tray includes a lower plate that defines a plurality of cylindrical transducer cavities having circular load diaphragms. An upper plate is attached to the lower plate through support posts projecting from the load diaphragms. The support posts have a circular cross-section and a diameter of about 5.0 mm. The lower plate further defines wiring channels communicating between the transducer cavities and a central cavity housing the circuit board for the telemetric tray. The wiring channels are arranged at a 45 degree angle relative to the sagittal plane of the knee joint in order to reduce the effects of the wiring channel intersection on the strain sensitivity of the tray. Each transducer cavity includes a radial strain gage array with four pairs of radially aligned strain gages, each pair aligned at a 45 degree angle relative to the sagittal plane of the knee joint.

Abstract: A pre-stressed orthopaedic implant includes a tension member extending through a bore in the implant. The tension member can include a bolt that is tightened into threads at the closed end of the bore, thereby compressing the implant between the bolt head and the threaded engagement. The implant is fixed within a bone while the implant is maintained in compression to improve the implant's ability to withstand tensile loads.

Abstract: A pre-stressed orthopaedic implant includes a tension member extending through a bore in the implant. The tension member can include a bolt that is tightened into threads at the closed end of the bore, thereby compressing the implant between the bolt head and the threaded engagement. In another embodiment, the tension member is a spring or a tension cable.

Abstract: A telemetric tibial tray includes a lower plate that defines a plurality of cylindrical transducer cavities having circular load diaphragms. An upper plate is attached to the lower plate through support posts projecting from the load diaphragms. The support posts have a circular cross-section and a diameter of about 5.0 mm. The lower plate further defines wiring channels communicating between the transducer cavities and a central cavity housing the circuit board for the telemetric tray. The wiring channels are arranged at a 45 degree angle relative to the sagittal plane of the knee joint in order to reduce the effects of the wiring channel intersection on the strain sensitivity of the tray. Each transducer cavity includes a radial strain gage array with four pairs of radially aligned strain gages, each pair aligned at a 45 degree angle relative to the sagittal plane of the knee joint.