Endoprosthetic bone joint

Details Endoprosthetic bone joint Endoprosthetic bone joint

1975-04-30

1976-03-30

Frinks, Ronald L.

Surgery

Truss

Pad

128 92C, A61F 124

Patent

active

039464458

ABSTRACT:
An endoprosthetic replacement for the metacarpophalangeal joint has two components, each with a rounded bearing body and integrally projecting intramedullary stem. The metacarpal component body provides two concave grooves separated by a concave rib, and the phalangeal component body provides two convex ribs and a convex groove, these ribs and grooves intermeshing for component engagement. The concave and convex configurations respectively subtend angles less and greater than 180.degree. to allow longitudinal sliding, and the convex groove widens towards one end to allow lateral rocking. The stems lie in the planes of their grooves and ribs, but are respectively inclined and parallel to the arcuate bisectors of such configurations. This allows the central rib and groove to limit the sliding abutment at their ends, with the stems parallel at one limit and angled at the other. The metacarpal component body overhangs its concave rib end further from its stem to provide, with the rounded bodies, knuckle simulation, and the convex groove is widened at the corresponding end.

REFERENCES:
patent: 3506982 (1970-04-01), Steffee
patent: 3651521 (1972-03-01), Devas
patent: 3760427 (1973-09-01), Schultz
patent: 3805302 (1974-04-01), Mathys
patent: 3869729 (1975-03-01), Attenborough

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