Femoral component for an implantable hip prosthesis
An orthopedic prosthesis for use in a hip replacement surgery includes an implantable stem component. The implantable stem component includes a core and a shell extending over the core. The shell includes a polymeric material and is configured to receive a femoral head component. Metal foam may extend over a portion of the shell.
1. A method of manufacturing an orthopaedic hip prosthesis comprising:
forming a core from a material having a high tensile strength and a high elastic modulus, and
attaching a polymeric shell to the core to position a proximal end of the core in a base of a tapered post of the polymeric shell, wherein attaching the polymeric shell includes placing a cover layer of the polymeric shell only on a lateral surface of a distal end of the core,
wherein the tapered post of the polymeric shell extends from the base to a proximal tip, and the tapered post is sized to be received in a tapered bore of an implantable head component.
2. The method of claim 1 , wherein attaching the polymeric shell includes:
defining a first thickness of polymeric material between a medial-most point of the polymeric shell and a medial-most point of a medial surface of the core when viewed in a transverse plane, and
defining a second thickness of polymeric material between a lateral-most point of the polymeric shell and a lateral-most point of a lateral surface of the core when viewed in a transverse plane,
wherein the first thickness is less than the second thickness.
3. The method of claim 1 , wherein forming the core includes forming a medial surface of the core such that the medial surface has a first radius when the orthopaedic hip prosthesis is viewed in the transverse plane, and forming a lateral surface of the core such that the lateral surface has a second radius greater than the first radius when the orthopaedic hip prosthesis is viewed in the transverse plane.
4. The method of claim 1 , wherein forming the core includes forming the core from a cobalt-chromium alloy.
5. The method of claim 1 , wherein forming the core includes forming the core from a titanium alloy.
6. The method of claim 1 , further comprising securing the implantable head component to the tapered post.
7. A method of manufacturing an orthopaedic hip prosthesis comprising:
forming a core from a material having a high tensile strength and a high elastic modulus, wherein forming the core includes forming a medial surface of the core such that the medial surface has a first radius when the orthopaedic hip prosthesis is viewed in the transverse plane, and forming a lateral surface of the core such that the lateral surface has a second radius greater than the first radius when the orthopaedic hip prosthesis is viewed in the transverse plane, and
attaching a polymeric shell to the core to position a proximal end of the core in a base of a tapered post of the polymeric shell,
wherein the tapered post of the polymeric shell extends from the base to a proximal tip, and the tapered post is sized to be received in a tapered bore of an implantable head component.
8. The method of claim 7 , wherein attaching the polymeric shell includes:
defining a first thickness of polymeric material between a medial-most point of the polymeric shell and a medial-most point of a medial surface of the core when viewed in a transverse plane, and
defining a second thickness of polymeric material between a lateral-most point of the polymeric shell and a lateral-most point of a lateral surface of the core when viewed in a transverse plane,
wherein the first thickness is less than the second thickness.
9. The method of claim 7 , wherein forming the core includes forming the core from a cobalt-chromium alloy.
10. The method of claim 7 , wherein forming the core includes forming the core from a titanium alloy.
11. The method of claim 7 , further comprising securing the implantable head component to the tapered post.