Anatomical motion hinged prosthesis

Details Anatomical motion hinged prosthesis Anatomical motion hinged prosthesis

A - Human Necessities

61

F

A61F 2/38 (2006.01)

Patent

CA 2656359

A hinged knee prosthesis (10) comprises a tibial component (16) and a femoral component (14). The tibial component (16) is configured to attach to a tibia. The tibial component has a bearing surface (128). The femoral component (14) is configured to hingedly attach to the tibial component (16) and rotate relative to the tibial component (16). The femoral component (14) comprises a medial condyle (30) and a lateral condyle (32). The medial and lateral condyles (30 and 32) have an eccentric sagittal curvature surface (50) configured to rotate and translate on the bearing surface (128) of the tibial component (16). A method of rotating a hinged knee (10) through a range of flexion is provided. The method fixedly attaches a femoral component (14) to a tibial component (16). Axial rotation of the femoral component (14) is induced relative to the tibial component (16) when the hinged knee (10) is flexed.

L'invention concerne une prothèse de genou articulée (10) comportant un composant tibial (16) et un composant fémoral (14). Le composant tibial (16) est configuré pour s'attacher à un tibia. Le composant tibial est doté d'une surface d'appui (128). Le composant fémoral (14) est conçu pour être attaché de façon articulée au composant tibial (16) et tourner par rapport au composant tibial (16). Le composant fémoral (14) inclue un condyle interne (30) et un condyle externe (32). Les condyles interne et externe (30 et 32) présentent une surface de courbure sagittale excentrée (50) configurée pour tourner et se déplacer en translation sur la surface d'appui (128) du composant tibial (16). L'invention concerne un procédé de rotation d'un genou articulé (10) par une plage de flexion. Le procédé permet d'attacher de façon fixe un composant fémoral (14) à un composant tibial (16). Une rotation axiale du composant fémoral (14) est induite par rapport au composant tibial (16) lorsque le genou articulé (10) est fléchi.

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