Abstract:
This application is directed toward a quantitative high precision acetabular machining system designed to enable accurate and precise positioning of acetabular resurfacing implants, or the like bone socket resurfacing devices, in a manner which eliminates malpositioning, loss of center, drift and inappropriate depth calculations. Subsequent to site preparation, a precision implant is disclosed which provides for resurfacing of damaged articular cartilage with bone preserving and non-drift instrumentation utilizing synthetic materials in an anatomically correct fashion to maintain excellent hip stability while maintaining an accurate hip joint center mated with anatomic femoral head sizes.
Abstract:
Screw-based primary fixation (5) of the prosthetic components within the medullary cavity solves the problem of micro-movements encounted in conventional press fit cementless fixation. For a total hip prosthesis (10), the stem (1) is fixed to the medial cortex of the proximal femur by the medial approach alone, obviating the need for drilling of the lateral cortex. The stem (1) may be implanted using a special drill guide instrumentation. Anchoring screws (5) are locked into the stem (1) of the femoral component (10), while self cutting threads on the screw heads (17) engage the pre-drilled medial cortex. This novel fixation principle can also be applied to other joint prosthesis, e.g. finger, shoulder, elbow and knee, as well as to dental and spinal implants.
Abstract:
This application is directed toward a quantitative high precision acetabular machining system designed to enable accurate and precise positioning of acetabular resurfacing implants, or the like bone socket resurfacing devices, in a manner which eliminates malpositioning, loss of center, drift and inappropriate depth calculations. Subsequent to site preparation, a precision implant is disclosed which provides for resurfacing of damaged articular cartilage with bone preserving and non-drift instrumentation utilizing synthetic materials in an anatomically correct fashion to maintain excellent hip stability while maintaining an accurate hip joint center mated with anatomic femoral head sizes.
Abstract:
Screw-based primary fixation (5) of the prosthetic components within the medullary cavity solves the problem of micro-movements encountered in conventional press fit cementless fixation. For a total hip prosthesis (10), the stem (1) is fixed to the medial cortex of the proximal femur by the medial approach alone, obviating the need for drilling of the lateral cortex. The stem (1) may be implanted using a special drill guide instrumentation. Anchoring screws (5) are locked into the stem (1) of the femoral component (10), while self cutting threads on the screw heads (17) engage the pre-drilled medial cortex. This novel fixation principle can also be applied to other joint prosthesis, e.g. finger, shoulder, elbow and knee, as well as to dental and spinal implants.