Hip prosthesis
OwnerJohn A. Jurgutisinventor
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Abstract
A hip prosthesis includes a femoral component with an elongated stem for seating within an elongated, longitudinally split sleeve having an exterior porous ingrowth surface. When implanted as a unit into the medullary canal, the femoral component stem wedges tightly into the sleeve to correspondingly press the sleeve into intimate and tight fit engagement with the bone. During normal postoperative use, any bone subsidence is accompanied by further wedging of the femoral component stem into the sleeve for maintenance of a secure mechanical interlock between the bone and prosthesis. However, in the event of failure for any reason, the femoral component and split sleeve are removable relatively easily to permit hip reconstruction with a new prosthesis.
Claims12
A hip prosthesis for implantation into the medullary canal of a resected femur, said prosthesis comprising:
- an elongated and substantially rigid femoral component having a head and an elongated stem;
- and
- an elongated, longitudinally split sleeve including a pair of sleeve halves with mating side margins having at least partially overlapping mating lips to define an elongated channel of closed cross sectional shape;
- said femoral component stem being received into said split sleeve channel and said stem and sleeve being receivable as a unit into the medullary canal of the resected femur, whereby normal postoperative patient function wedges said stem tightly into said sleeve to wedge said sleeve into tight intimate contact with the bone surface lining the medullary canal.
A hip prosthesis for implantation into the medullary canal of a resected femur, said prosthesis comprising:
- an elongated and substantially rigid femoral component having an upper head, an elongated lower stem, and a short neck joined between said head and stem;
- said femoral component stem having a generally elliptical cross section shape generally at the upper end thereof and extending downwardly therefrom generally along a curved centerline approximating the centerline of the medullary canal with a progressively diminishing major axis to a lower stem end of substantially circular cross section;
- and
- an elongated, longitudinally split sleeve formed from a pair of sleeve halves with mating side margins including at least partially overlapping mating lips to define an elongated channel of closed cross sectional shape for close reception of said femoral component stem downwardly into said channel with a wedging action;
- said sleeve halves being receivable into the medullary canal of the resected femur and said femoral component stem being receivable downwardly into said sleeve with a wedging action to urge the exterior surfaces of said sleeve into intimate surface engagement with the bone lining the medullary canal.
A prosthesis for implantation into the medullary canal of a resected bone, said prosthesis comprising:
- an elongated and substantially rigid prosthesis component having an elongated stem of diminishing cross sectional size from a proximal to distal end thereof;
- and
- an elongated and longitudinally split sleeve having a pair of sleeve halves with mating side margins including at least partially overlapping mating lips to define an elongated channel of closed cross sectional shape diminishing in size from a proximal to distal end thereof and an exterior surface geometry for close conformance with the bone lining the medullary canal;
- said sleeve being receivable into said medullary canal and said stem being receivable into said sleeve channel with a wedging action to urge said sleeve tightly into intimate surface engagement with the bone lining the medullary canal.
Dependencies are inferred from the claim text.