Prosthetic femoral stem

Details Prosthetic femoral stem Prosthetic femoral stem

1991-10-04

1992-10-06

Frinks, Ronald

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

Implantable prosthesis

Bone

623 16, A61F 236, A61F 228

Patent

active

051527995

ABSTRACT:
A femoral stem prosthesis including a stem tapering from a proximal end to a distal end, and having a primary zone of taper and a secondary zone of taper. The secondary zone of taper, located at the distal end of the stem, has a larger angle of taper than that of the primary zone of taper, but substantially less than the taper in prior art stems. In the secondary zone of taper, the stem gradually tapers away from the femoral bone to avoid a sudden change in stress level in the bone at the distal stem tip, thus avoiding the incidence of thigh pain. The stem of the inventive prosthesis preferably includes longitudinal channels to increase its flexibility and preferably has a trapezoidal cross-sectional geometry to resist rotational forces and to provide multi-plane stability within the femur, thereby providing effective stress transfer to the femur.

REFERENCES:
patent: 4404693 (1983-09-01), Zweymuller
patent: 4714470 (1987-12-01), Webb, Jr. et al.
patent: 4908035 (1990-03-01), Deckner et al.
patent: 5004475 (1991-04-01), Vermeire
Englehardt, J. A. et al., "Hip Stem Fixation and Tip Geometry: A Theoretical Model for Thigh Pain", Mar. 4-7, 1991, 37th Ann. Orthopedic Research Society.

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