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Method and apparatus for hip prosthesis
| Details |
Inventors: Dennis, Douglas A.; Komistek, Richard D.;
Assignee: Rose Biomedical Research (Denver, CO)
Primary Examiner: Isabella; David J.
Assistant Examiner:
Attorney, Agent or Firm: Gibson, Dunn & Crutcher LLP
An prosthesis for allowing natural ball and socket type movement, as in a hip or shoulder. A femoral component having a ball at one extremity is engaged with an acetabular component having a hemispherical cup to receive the ball. A ligamentous material extends from a port in the hemispherical cup to a port in the ball to apply a resistive force to resist any dislocating force, the resistive force varying in proportion to the movement of the femoral component from a natural and relaxed position in relation to the acetabular component. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT An elevation view of a preferred embodiment of the invention 10 is depicted in FIG.
1 in which the bone structure of the patient is shown in phantom.
A femoral component 20 includes a ball 22 at the femoral extreme, the ball being in the shape of a partial sphere or a hemisphere.
The ball is attached to or formed integrally with a neck portion 24 of the femoral component 20, which in turn is attached to or formed integrally with a stem portion 26 of the femoral component 20.
The femoral component 20 is of an overall shape and size that is typical in the field of hip prostheses.
In-growth texturing is on the surface of portions of the femoral component 20, illustrative texturing 28 being shown in FIG.
1.
The femoral component 20 may or may not be attached to the femur with cement.
The femoral component 20 is fabricated in the well-known manner from forged stainless steel or other durable biocompatible material such as titanium or cobalt alloys or alumina or zirconia ceramics.
The normal size, shape, material and manufacture of the femoral component of hip prostheses are generally known in the art, and are not further described herein.
The femoral component 20 of the present invention 10 differs from those of the prior art in that a ligament port 30 extends from the femoral component extreme at the ball 22 surface, through the femoral neck 24, and to the surface of femoral stem 26.
The preferred embodiment shown in FIG.
1 shows the ligament port 30 as substantially straight, extending radially from the ball 22 surface, through the ball 22 center.
However, the ligament port 30 may assume other directions as well, so long as the ball end 32 of the ligament port 30 meets the ball 22 surface.
The port could therefore be blind, or could exit through the femoral neck 24, or a portion of the ball 22 that does not engage the cup, or through some other location on the femoral stem 26.
Of course, a straight port 30 is easier to produce, because it can be made with a single drilling operation rather than involving casting or multiple drilling or complex machining operations
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