Hip prosthesis

Details Hip prosthesis Hip prosthesis

A - Human Necessities

61

F

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

Patent

CA 2197315

The prosthesis of the invention comprises a shaft (1) with its upper end (3) linked to a neck (2) connecting it to a spherical joint head. The shaft (1) comprises a proximal area (H1, H2) with a reversed spiral double twist, over a length substantially equal to one third or half of the length (H) of the shaft (1). The proximal segment (H2) of the proximal area and the distal area (H3) are generally rectilinear in the antero-posterior plane, while the distal segment (H1) of the proximal area is curved with the center offset frontwards. The invention provides a prosthesis that fits more effectively in the medullary channel and does not need cement to fix it.

La prothèse selon l'invention comprend une tige (1) dont l'extrémité supérieure (3) se raccorde à un col (2) qui la relie à une tête sphérique (4) d'articulation. La tige (1) comprend une zone proximale (H1, H2) présentant une double torsion hélicoïdale inversée, sur une longueur sensiblement égale au tiers ou à la moitié de la longueur (H) de la tige (1). Le segment proximal (H2) de zone proximale et la zone distale (H3) sont généralement rectilignes dans le plan antéro-postérieur, tandis que le segment distal (H1) de zone proximale présente une courbure à centre décalé vers l'avant. On réalise ainsi une prothèse dont l'adaptation dans le canal médullaire est améliorée, permettant une pose sans ciment.

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