초록 ▼

A stemmed femoral component for the human hip for which fixation is provided by bony ingrowth and which may be easily removed for replacement thereof by an osteotone. The two-piece component includes a stem which is elongated and has on its proximal end a Morse cone and a laterally extending collar

A stemmed femoral component for the human hip for which fixation is provided by bony ingrowth and which may be easily removed for replacement thereof by an osteotone. The two-piece component includes a stem which is elongated and has on its proximal end a Morse cone and a laterally extending collar adapted to reside on the cortical bone in the region of the femoral neck. The stem is textured or provided with a porous material on its outer surfaces only in the metaphyseal portion and only on the anterior, lateral, and posterior surfaces. The medial surface is smooth, as is the diaphyseal portion of the stem. In this manner, bony ingrowth takes place only in regions that can be reached with a osteotone for removal. A threaded extractor and mating hole in a driving platform may also be provided for removal.

대표청구항 ▼

A femoral component for hip prostheses for the human hip comprising: an elongated femoral stem adapted to be inserted into a medullary canal of a femur bone of a human being, said femoral stem having a metaphyseal portion adapted to be placed in a medullary area of the femur and a diaphyseal portion

A femoral component for hip prostheses for the human hip comprising: an elongated femoral stem adapted to be inserted into a medullary canal of a femur bone of a human being, said femoral stem having a metaphyseal portion adapted to be placed in a medullary area of the femur and a diaphyseal portion adapted to extend to an isthmus of the medullary canal of the femur, the metaphyseal portion of the stem having lateral, medial, anterior and posterior surfaces; porous means disposed on the lateral, posterior and anterior surfaces of said metaphyseal portion of said stem for permitting bony ingrowth from the proximal end of the femur into said stem, the medial surface of the metaphyseal portion of the stem and all external surfaces of the diaphyseal portion of the stem being smooth so as to prevent bony ingrowth from the femur to said stem in the diaphyseal portion and on the medial surface of the metaphyseal portion of said stem; and a collar disposed on the proximal end of said stem adjacent said metaphyseal portion thereof and extending transversely of the direction of elongation of said stem beyond the medial surface but not beyond the lateral, posterior and anterior surfaces for enabling a direct osteotomy to be performed on the lateral, anterior and posterior surfaces of the metaphyseal portion of the stem.