Bone joint prosthesis

Details Bone joint prosthesis Bone joint prosthesis

1986-06-10

1989-04-18

Apley, Richard J.

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

Implantable prosthesis

Bone

A61F 334

Patent

active

048223697

ABSTRACT:
An improved bone joint prosthesis, particularly a whole hip or shoulder prosthesis, provides long life and prevents dislocation. The cotyle has a resilient, shock absorptive layer sandwiched between inner and outer hemispheric elements. The inner element is coated with a low friction coating which cooperates with the head to provide smooth operation and extended life. Materials which may be used include a high density reticulated polyethylene on the cotyle surface in combination with an alumina head. Particularly good results are obtained using a gold cotyle surface in combination with a highly polished chromium oxide head. A retainer which may be readily fastened to the cotyle during implantation is provided to prevent dislocation of the femoral head from the cotyle. In a preferred embodiment, the lip of the retainer is resilient and permits limited displacement of the head while preventing complete dislocation.

REFERENCES:
patent: 2947308 (1960-08-01), Gorman
patent: 3067740 (1962-12-01), Haboush
patent: 3894297 (1975-07-01), Mittelmeier et al.
patent: 3996625 (1976-12-01), Norles
patent: 4263681 (1981-04-01), Notton
patent: 4366183 (1982-12-01), Ghommidh et al.
patent: 4380090 (1983-04-01), Ramos
patent: 4427501 (1984-01-01), Rogers

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