Non-dislocatable low-wear hip prosthesis

Details Non-dislocatable low-wear hip prosthesis Non-dislocatable low-wear hip prosthesis

A - Human Necessities

61

F

A61F 2/32 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01) A61F 2/34 (2006.01) A61F 2/36 (2006.01)

Patent

CA 2245249

A hip prosthesis comprising a femoral stem (3), a spherical head (6) fitted over the neck (5) of the femoral stem, and a metal socket (1) with which the head is pivotably engageable. A cup (7) is inserted between the head (6) and the socket, the head and the cup are made of a ceramic or similar material having a low friction coefficient, and the head is pivotable on the cup. Said cup is pivotably fitted in a plastic socket (8) that is in turn fitted in the metal socket (1). Said prosthesis thus comprises two joints, one between the head (6) and the cup (7), and another between the cup (7) and the polyethylene socket (8), the first ceramic-ceramic joint being exposed to most stress. As a result, the wear of the polyethylene socket (8) produces very few loose particles, whereby the risk of separation is substantially reduced and the total lifetime of the prosthesis is greatly extended. The prosthesis has low wear properties.

Cette prothèse de hanche comporte une tige fémorale (3), une tête sphérique (6) adaptée pour coiffer un col (5) de la tige fémorale, et un cotyle métallique (1) dans lequel peut s'articuler la tête; une cupule (7) est interposée entre la tête (6) et le cotyle, la tête et la cupule sont en céramique ou matériau similaire à faible coefficient de frottement, la tête étant articulée sur la cupule; la cupule elle-même est articulée dans un cotyle (8) en matière plastique fixé dans le cotyle métallique (1). Cette prothèse comporte ainsi une double articulation, d'une part entre sa tête (6) et la cupule (7), et d'autre part entre la cupule (7) et le cotyle (8) en polyéthylène, la première articulation céramique-céramique étant principalement sollicitée. De ce fait l'usure du cotyle (8) en polyéthylène produit extrêmement peu de débris, ce qui réduit considérablement les risques de descellements et allonge de manière très importante la durée de vie totale de la prothèse. Cette prothèse est peu usable.

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