Collarless femoral hip prosthesis

Details Collarless femoral hip prosthesis Collarless femoral hip prosthesis

1987-03-30

1992-10-20

Isabella, David

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

A61F 234

Patent

active

051566273

ABSTRACT:
A femoral stem type hip joint prosthesis system includes a series of shoulderless or collarless, anatomically contoured stems of differnt sizes for firm implantation into the intramedullary canal of the femur; and a series of head units having variable neck lengths so that anatomically correct positioning of the head of the prosthesis may be obtained with varying depths of implantation of the stem, and normal anatomical variations. The stem may be smoothly tapered, and may have a rectangular cross-sectional configuration with substantially greater width in the medial/lateral direction than in the anterior/posterior direction. The stem may have a medical curvature of approximately six inches and a lateral curvature of approximately three inches adjacent its proximal or upper end, and this curved upper portion blends smoothly into a tapered lower section, having a centerline which is straight, and with the implanted portion of the stem being in the order of four and one-half inches or more in length.

REFERENCES:
patent: 4459708 (1984-07-01), Buttazzoni
Tronzo "Total Hip Arthroplasty" J.B.J.S. vol. 53-A No. 7 Oct. 1971.
Spectron "The Spectron System Conversion Fem. Endoprosth.; The Technique" Richard 1978.

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