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Hip-joint prosthesis

  • US 3,891,997 A
  • Filed: 03/11/1974
  • Issued: 07/01/1975
  • Est. Priority Date: 02/20/1974
  • Status: Expired due to Term
First Claim
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1. A prosthetic hip joint comprising:

  • a femoral element formed with a ball head and a stem projecting from said head and adapted to be received within the upper end of a femur, and a generally hemispherical socket element adapted to be secured in a predetermined orientation in an ilium at the acetabulum thereof and having an inner surface formed as a generally hemispherical cavity having a single center of curvature and receiving snugly said ball head, and having an outer surface formed as a lower quarter-spherical region having a center of curvature lying above the center of curvature of said cavity and an upper quarter-spherical region adjoining and above said lower region and having a center of curvature coinciding with said single center of curvature of said cavity, said socket element being of uniform radial thickness throughout said upper region and of upwardly increasing radial thickness at said lower region.

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