Blade-like stem for a femoral head prosthesis

Details Blade-like stem for a femoral head prosthesis Blade-like stem for a femoral head prosthesis

1989-12-08

1990-07-31

Frinks, Ronald L.

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

Implantable prosthesis

Bone

623 18, A61F 236

Patent

active

049447610

ABSTRACT:
The stem of the femoral head prothesis has a distal zone of cylindrical cross-section and a proximal zone of rectangular cross section which extends from the distal zone. The sides of the stem in the proximal zone are plane with outstanding parallel ribs which can be driven into the spongy tissue of a femur bone. The ribs on the anterior side of the stem are of a lower height than the ribs on the posterior side. The outermost ribs on each side provide for a resilient four-point bearing on the hard cortical shell of the fem>r bone. A pair of trochanter wings are provided on the narrow lateral side to penetrate into the cortical shell of the femur bone in order to preclude rotation of the stem within the bone.

REFERENCES:
patent: 2719522 (1955-10-01), Hudack
patent: 4068324 (1978-01-01), Townley et al.
patent: 4661112 (1987-04-01), Muller
patent: 4695283 (1987-09-01), Aldinger
patent: 4728334 (1988-03-01), Spotorno

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