Femur component of a hip joint endoprosthesis

Details Femur component of a hip joint endoprosthesis Femur component of a hip joint endoprosthesis

A - Human Necessities

61

F

A61F 2/36 (2006.01) A61F 2/30 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2273229

The invention relates to a femur component of a hip joint endoprosthesis which has shaft (1) for anchoring in the medullary cavity of the femur. The shaft (1) has a distal section (9) and a proximal section (8), to which is connected a collar section (2) with a peg (3) for receiving an articular head, or with an articular head which is firmly attached to the collar section (2). The shaft (1) comprises a front surface (4), a rear surface (5), a lateral side (6), a medial side (7) and a plane of symmetry (11), whereby longitudinal ribs (10) which stretch from proximal to distal are fitted on the front surface (4) and the rear surface (5) in the proximal section (8) of the shaft (1). The crests (12) of the longitudinal ribs (10) form an angle .delta./2 of at least 1~ to the plane of symmetry (11), and the envelope of the crests (12) of the longitudinal ribs (10) forms a double wedge-like or elliptoide body, which tapers both towards the lateral side (6) and the medial side (7).

L'invention concerne un élément fémur d'une endoprothèse d'articulation de la hanche, comprenant une tige (1) à ancrer dans la cavité médullaire du fémur. Cette tige (1) est dotée d'une partie distale (9) et d'une partie proximale (8) prolongée par une partie col (2) qui est pourvue d'un tourillon (3) afin de recevoir une tête d'articulation ou d'une tête d'articulation solidaire de la partie col (2). La tige (1) comporte une surface antérieure (4), une surface postérieure (5), une face latérale (6), une face médiale (7) et un plan symétrique (11). La face antérieure (4) et la face postérieure (5) de la tige (1) sont dotées dans la partie proximale (8) de rainures longitudinales (10) qui s'étendent de la zone proximale à la zone distale. Les arêtes (12) des rainures longitudinales (10) forment un angle .delta./2 d'au moins 1· par rapport au plan symétrique (11) et la courbe enveloppante de ces arêtes (12) forment un corps à double coin ou un corps ellipsoïde s'effilant en direction de la face latérale (6) comme de la face médiale (7).

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