Knee joint prosthesis with patellar-femoral contact

Details Knee joint prosthesis with patellar-femoral contact Knee joint prosthesis with patellar-femoral contact

1977-02-16

1978-06-13

Frinks, Ronald L.

Surgery

Truss

Pad

128 92C, A61F 124

Patent

active

040940179

ABSTRACT:
A knee joint prosthesis of the type described in U.S. Pat. No. 3,868,730 has a pair of inwardly sloped radially merging extensions of its condyle runners forming a patella-guiding trough above and between the runners. The extensions merge smoothly into each other at an angle of about 150.degree.. The center of curvature of the base of the trough is about 1.25 inches about a center located a little behind and somewhat above the center of movement of the femoral component. The extension narrows towards its upper portion. The patellar component, which rides in the base of the trough, is made of ultra-high molecular weight polyethylene and has a circular cross section with two bearing surface facets on both sides of a concave arcuate ridge which tracks in the base of the trough, for substantially complete contact between the patellar component and the trough substantially over their full range of movement. The patellar component is retained in a metal holder which has fixation lugs for connecting it under the patella.

REFERENCES:
patent: 3728742 (1973-04-01), Averill et al.
patent: 3806961 (1974-04-01), Muller
patent: 3816855 (1924-06-01), Saleh
patent: 3868730 (1975-04-01), Kaufer et al.
patent: 3945053 (1976-03-01), Hillberry et al.
patent: 3964106 (1976-06-01), Hutter, Jr. et al.
"A New Patella Prosthesis" by P. Aglietti et al., Clinical Orthopaedics and Related Research, No. 107, Mar.-Apr., 1975, pp. 175-187.
"The Spherocentric Knee" by Larry S. Matthews et al., Clinical Orthopaedics and Related Research, No. 94, Jul.-Aug. 1973, pp. 234-241.

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