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US 6,273,915 B1Granted
Femoral head-neck prosthesis and method of implantation
OwnerJames B. Grimesinventor
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OwnerJames B. Grimesinventor
Estimating the term…
A femoral head-neck prosthesis (1) which allows natural straining of the upper femur to prevent bone loss. The natural angle of loading of the bone is determined prior to the operation, and the prosthesis is implanted with its longitudinal axis (AX-1) parallel to the natural angle (AX-5). The prosthesis is constructed to inhibit axial fixation and “splinting” of the prosthesis below the interface between the femur neck and the prosthesis on the upper femur. Splines (19) on a stem (13) of the prosthesis help to fix the prosthesis against rotation and toggling motion. The prosthesis is asymmetrical about its longitudinal axis to provide further stability when implanted. The prosthesis and its method of implantation preserve the trochanter and cap the femur to prevent microscopic debris from entering the interior bone.
A femoral prosthesis for implantation in a femur, the prosthesis comprising a neck adapted to receive a ball thereon, a collar on which the neck is mounted and a stem extending from the collar on the opposite side of the collar from the neck, the prosthesis having a longitudinal axis corresponding to the longitudinal axis of the stem and being configured for transosseous implantation in which the stem enters the bone generally at one side thereof, crosses a medullary canal and enters cortical bone on an opposite side of the bone, the stem being constructed and arranged to fix the prosthesis from movement about its longitudinal axis and about axes perpendicular to the longitudinal axis and to inhibit axial fixation of the stem upon implantation in the femur, thereby to achieve substantially natural loading of the upper femur.
A femoral prosthesis for implantation in a femur, the prosthesis comprising a neck adapted to receive a ball thereon, a collar on which the neck is mounted and a stem extending from the collar on the opposite side of the collar from the neck, the prosthesis having a longitudinal axis corresponding to the longitudinal axis of the stem, the neck having a longitudinal axis parallel to the longitudinal axis of the stem, the collar being continuous about the circumference of the prosthesis, extending outwardly laterally, anteriorly, medially and posteriorly and sized and shaped to cap the medullary canal of the femur exposed after resection of the femur thereby to prevent migration of joint wear debris into the medullary canal.
A method for implanting a non-cemented femoral head-neck prosthesis in a femur, the femur having a shaft and a neck at the upper end of the shaft at the medial side of the femur, the method comprising the steps of:
A bone prosthesis for implanting in a bone at a joint, the prosthesis comprising a neck adapted to receive a ball, a collar on which the neck is mounted and a stem extending from the collar on the opposite side of the collar from the neck, the prosthesis having a longitudinal axis corresponding to the longitudinal axis of the stem and being configured for transosseous implantation in which the stem enters the bone generally at one side thereof, crosses a medullary canal and enters cortical bone on an opposite side of the bone, the stem being constructed and arranged to fix the prosthesis from movement relative to the bone about its longitudinal axis and about axes perpendicular to the longitudinal axis and to inhibit axial fixation of the stem upon implantation in the bone.
A femoral prosthesis for implantation in a femur, the prosthesis comprising a neck adapted to receive a ball thereon, a collar on which the neck is mounted and a stem extending from the collar on the opposite side of the collar from the neck, the prosthesis having a longitudinal axis corresponding to the longitudinal axis of the stem, the neck having a longitudinal axis parallel to the longitudinal axis of the stem thereby to achieve substantially natural loading of the upper femur.
A femoral prosthesis for implantation in a femur, the prosthesis comprising a neck adapted to receive a ball thereon, a collar on which the neck is mounted and a stem extending from the collar on the opposite side of the collar from the neck, an upper portion of the stem having the shape of two parallel, partially radially overlapping elements.
Dependencies are inferred from the claim text.