Load sharing femoral hip implant

Details Load sharing femoral hip implant Load sharing femoral hip implant

1990-03-30

1991-01-22

Isabella, David J.

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

Implantable prosthesis

Bone

623 18, A61F 234

Patent

active

049868349

ABSTRACT:
A controlled stiffness elongated implant for use in the hip or other appropriate body joint. In the instance of the hip, a ball member fixed to the femur is rotatably engaged with a cup-shaped socket member fixed to the acetabulum of the pelvic bone. The ball member is mounted on one end of a femoral component which has an elongated stem receivable in the intramedullary canal of the femur. The stem has a generally longitudinally directed reduced mid-stem section. The dimension of the reduced mid-stem section is uniform or variable between the proximal and distal ends so as to affect the mass moment of inertia at any given location along the length of said stem to thereby achieve an optimal stem flexibility.

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patent: 4546501 (1985-10-01), Gustilo et al.
patent: 4619659 (1986-10-01), Witzel
patent: 4661112 (1987-04-01), Muller
patent: 4714470 (1987-12-01), Webb, Jr. et al.
"Effect of Femoral Component Section Modulus on the Stress Distribution in the Proximal Human Femur", 8 pages, John A. Engelhardt, Med. & Biol. Eng. & Comput.

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