Femoral hip prosthesis part, a set of such femoral parts and...

Details Femoral hip prosthesis part, a set of such femoral parts and... Femoral hip prosthesis part, a set of such femoral parts and...

A - Human Necessities

61

F

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

Patent

CA 2461455

The invention relates to a femoral prosthesis part, the metaphyseal part of which comprises a series of geometric sections (SA to SG) which are disposed in parallel to the transverse plane at equidistant levels. The aforementioned geometric sections are provided with a quadrilateral shape having strongly rounded summits.The two long sides of said sections converge in the medial direction and each section lies inside a geometric quadrangle which is located in the plane. The four sides of said quadrangle intercept, respectively, four geometric lines (m, l, a, p) which are obtained by projecting the profiles of the internal surface of the cortical bone. The above-mentioned geometric sections pivot in relation to one another in internal rotation from the bottom upwards in order to obtain the desired helitorsion angle.

Partie fémorale de prothèse, dont la partie métaphysaire présente une succession de sections géométriques (SA à SG) parallèles à un plan transversal à des niveaux équidistants, qui ont une forme de quadrilatère à sommets fortement arrondis avec deux grands côtés convergeant en direction médiale, chaque fois inscrit dans un quadrilatère géométrique situé dans le plan et qui intercepte par ses quatre côtés, respectivement, quatre lignes géométriques (m, l, a, p) obtenues par projection des profils de la surface interne de la corticale, lesdites sections pivotant l'une par rapport à l'autre en rotation interne depuis le bas vers le haut, pour aboutir à l'angle d'hélitorsion souhaité.

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