Hip prosthesis structure adapted for easy fitting to the patient coxo-femural articulation

Claim 1

A hip prosthesis comprising an elongated oval cross-section stem, said stem having a first set curvature, a plurality of longitudinal extending slots formed on said stem, said stem including a first pointed end portion and an opposite enlarged second end portion, said enlarged portion having a second set curvature different from said first set curvature of said stem, a plurality of spaced bone gripping grooves formed on said enlarged end portion, an oval cross-section seat formed in said enlarged portion and a coupling element for coupling said stem to a prosthesis head, said coupling element including a middle body and two coupling element end portions integral with and on opposite ends of said middle body, one of said end portions having an oval cross-section for engaging in said seat and the other of said end portions having a frustum of cone shape, said coupling element being so designed that, as said oval cross-section end of said coupling element is engaged in said seat, said middle body and said other end portion of said coupling element provide an extension having a curvature substantially corresponding to said second set curvature of said enlarged end portion of said stem.