Patent ID: 8764846
Filing Date: 2014-07-01
Classification: A61F

Abstract:
1. Hip prosthesis comprising a femoral stem that can be inserted within a medullar channel of a patient femur, said femoral stem being provided with substantially longitudinal lateral reliefs, so that said stem can be fixed to the bone tissue by pressure, and a prosthetic neck, provided with means for coupling with a morse cone type spherical head, said prosthesis being characterised in that: said femoral stem includes a proximal portion and a distal portion, said proximal portion including a bevelled shoulder on a lateral side and a rounded portion on a medial side, and said distal portion including a bevelled lateral tapered surface and a bevelled medial tapered surface that approach one another at a distal apex, a cross section of said longitudinal reliefs has peak portions, having the lateral walls thereof at an apex portion of the peak portions included within a first angle (c), and having lateral walls thereof included at a base portion of the peak portions included within a second angle (d), which is minor or equal to said first angle (c), and grooves are provided between said peak portions, that can be homogeneously filled with spongious bone tissue while the lug portions penetrate the spongious bone tissue, and wherein the peak portions of the longitudinal reliefs taper with respect to a longitudinally extending medial to lateral center plane (T) toward the lateral side at a first angle (z), while the peak portions of the lateral reliefs taper with respect to the longitudinally extending medial to lateral center plane (T) toward the medial side at a second angle (y) that is smaller than the angle (z), wherein said base portions of the longitudinal reliefs also taper with respect to the center plane (T) toward the lateral side at the first angle (z), while the base portions of the lateral reliefs taper with respect to the center plane (T) toward the medial side at the second angle (y).