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Hip-joint prosthesis

  • US 4,101,985 A
  • Filed: 03/18/1977
  • Issued: 07/25/1978
  • Est. Priority Date: 03/20/1976
  • Status: Expired due to Term
First Claim
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1. A prosthesis comprising a ball head shaped to fit in an acetabulum, an elongated shaft shaped to fit in and between the two opposite sides of a medullary cavity of a femur, and a stem between and connecting said head to one end of said shaft, said shaft being curved in a plane and having a concave longitudinal edge and a convex longitudinal edge and said stem being inclined in said plane to the longitudinal axis of said shaft, said prosthesis being formed with:

  • a laterally projecting shoulder engageable against a sawed-off end of a femur in whose medullary cavity said shaft is to be engaged;

    an inner engagement surface on said concave edge adjacent said shoulder and engageable with one of said sides of a medullary cavity of said femur;

    an outer engagement surface on said concave edge at the other end of said shaft and engageable with said one side of a medullary cavity of said femur;

    an intermediate engagement surface on said convex edge between said inner and outer engagement surfaces and generally parallel to said outer engagement surface, said intermediate engagement surface being engageable with the other side of a medullary cavity of said femur; and

    a connecting surface to each longitudinal side of and inclined to each of said engagement surfaces and adapted to lie out of contact with the sides of said medullary cavity.

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