Modular prosthetic component with improved body shape
An improved body element for use in a modular prosthetic stem component of the sort comprising a body element and at least one other element, wherein the body element and the at least one other element are joined together by at least one modular connection, wherein the improved body element comprises an anterior wall and a posterior wall, at least one of the anterior wall and the posterior wall converging toward the other on the medial side of the body element and diverging away from the other on the lateral side of the body element, whereby the body element approximates a general wedge shape.
1. A prosthetic total hip joint comprising:
a modular prosthetic femoral stem component for seating in a proximal section of a resected femur; and
a prosthetic acetabular cup component for seating in a socket of an acetabulum;
wherein said modular prosthetic femoral stem component comprises a body element, a neck element, and a stem element;
wherein said body element consists of four substantially flat sides comprising an anterior wall, a posterior wall, a lateral aspect, and a medial aspect, which are configured so as to form a generally trapezoidal configuration comprising four vertices, with said lateral aspect and said medial aspect being generally parallel to one another, and with the anterior wall and the posterior wall tapering towards one another in the medial direction, so as to provide rotational stability within the resected femur; and
wherein each of the four vertices of said body element is provided with a rounded non-angular configuration;
said body element being sized and configured to closely approximate the inner contour of the hard cortical bone of the resected femur while leaving a small amount of compacted cancellous bone between the body element and the cortical bone of the resected femur, such that said body element is adapted to fit in the resected femur;
said body element being provided with an aperture into which a portion of said neck element and said stem element extend;
wherein said body element and said stem element are joined together by a modular connection;
said stem element being of a size and configuration for seating within a medullary canal of the femur;
wherein said body element and said neck element are joined together by a second modular connection;
wherein said neck element is provided with a ball portion fixed thereon and adapted for seating in said acetabular cup;
said body element, said neck element, and said stem element being adapted to be secured to one another to form said prosthetic femoral stem component.