Emulating natural knee kinematics in a knee prosthesis

Details Emulating natural knee kinematics in a knee prosthesis Emulating natural knee kinematics in a knee prosthesis

A - Human Necessities

61

F

A61F 2/38 (2006.01)

Patent

CA 2455040

A knee prosthesis and method for emulating movements, during flexion, of a natural knee joint replaced by the knee prosthesis, by enabling engagement and relative movement between the femoral component and the tibial component of the knee prosthesis along arcuate tracks, including rotational movement about a longitudinal axis of rotation, during flexion about a transverse axis of rotation, and maintaining the transverse axis of rotation essentially in a generally medial--lateral longitudinal plane maintained in close proximity with a generally coronal plane passing through the centers of curvature of the arcuate tracks during flexion within at least a prescribed range of flexion extending from about 0° of flexion to a predetermined degree of flexion, preferably about 60° of flexion. A stabilizing mechanism couples the femoral component with the tibial component within a portion of the prescribed range of flexion, the portion being between about 45° of flexion and about 60° of flexion, for providing stability and for assisting in maintaining the transverse axis of rotation essentially in the longitudinal plane, and the longitudinal plane in close proximity with the coronal plane as the longitudinal plane is rotated about the longitudinal axis of rotation.

L'invention concerne une prothèse de genou et une méthode de reproduction des mouvements naturels, en flexion, de l'articulation du genou par la prothèse, en permettant l'engagement de l'élément fémoral et de l'élément tibial de la prothèse et leur mouvement relatif le long d'une trajectoire arquée. Ces mouvements comprennent la rotation autour de l'axe longitudinal associée à la flexion autour de l'axe transversal ainsi que le maintien de l'axe transversal de rotation dans un plan longitudinal médio-latéral très rapproché du plan frontal qui passe par le centre de la courbe de la trajectoire arquée pendant la flexion, dans une plage d'amplitude prévue allant d'environ 0 degré à un degré de flexion prédéterminé, préférablement d'environ 60 degrés. Un mécanisme de stabilisation réunit l'élément fémoral et l'élément tibial à l'intérieur d'une portion de la plage d'amplitude prédéterminée, c'est-à-dire entre environ 45 degrés et 60 degrés de flexion, afin d'offrir une stabilité et de contribuer au maintien de l'axe transversal de rotation essentiellement le long d'un plan longitudinal à proximité du plan frontal pendant que le plan longitudinal subit une rotation le long de l'axe longitudinal.

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