Hip prosthesis comprising a shaft to be inserted into the femur

Details Hip prosthesis comprising a shaft to be inserted into the femur Hip prosthesis comprising a shaft to be inserted into the femur

A - Human Necessities

61

F

A61F 2/36 (2006.01) A61F 2/30 (2006.01) A61F 2/32 (2006.01)

Patent

CA 2498387

Hip prosthesis comprising a straight shaft (1) which is to be inserted into the femur and whose proximal part (6) to be inserted in the metaphyseal region of the femur comprises, on the front face and rear face, in each case at least one projecting fin (8) with a medially steep flank (23). At least over part of its length, this fin (8) deviates away from the longitudinal direction (27) of the shaft (1) and at the top is inclined toward the femoral neck (2) . In this way, when the shaft is driven into the bone, the bone substance surrounding the fin (8) is compacted and is able to absorb greater forces. The height of the fin (8) decreases from its medial flank (23) toward its lateral edge (25).

Prothèse de la hanche pourvue d'une tige droite (1) destinée à être ancrée dans le fémur, dont la partie proximale (6) destinée à être introduite dans la zone métaphysaire du fémur comporte sur les faces avant et arrière au moins une nervure (8) saillante pourvue d'un flanc (23) abrupt à orientation centrale. Cette nervure (8) présente au moins sur une partie de son extension une orientation s'éloignant du sens longitudinal (27) de la tige (1) et s'inclinant vers le haut en direction du col (2) du fémur. Grâce à cette nervure, l'enfoncement de la tige dans l'os densifie la substance osseuse située au voisinage de la nervure (8) et lui permet de recevoir des forces plus élevées. La hauteur de la nervure (8) diminue de son flanc central (23) vers son flanc latéral (25).

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