Semi-restraining knee prosthesis

Details Semi-restraining knee prosthesis Semi-restraining knee prosthesis

1978-10-16

1980-08-05

Frinks, Ronald L.

Surgery

Truss

Pad

128 92C, A61F 124

Patent

active

042154391

ABSTRACT:
A surface replacement knee joint prosthesis is provided which restrains axial and lateral rotation of the knee joint when the leg is fully extended, and superior-inferior dislocation at all times. The prosthesis has femoral and tibial members articulated by spaced spheroidal load-sharing condylar surfaces with substantially matching radii of curvature. The femoral member defines a tapering channel positioned between the spaced condylar surfaces. A stem having a truncated head projects superiorly from the tibial member and progressively engages the tapering channel during extension, for restraining the rotation and dislocation of the knee joint when the leg is fully extended. When the leg is in flexion, the clearance between the stem and the diverging arms which define the channel allows axial and lateral rotation as in a natural knee joint.

REFERENCES:
patent: 3728742 (1973-04-01), Averill et al.
patent: 3748662 (1973-07-01), Helfet
patent: 3795922 (1974-03-01), Herbert et al.
patent: 3816855 (1974-06-01), Saleh
patent: 4081866 (1978-04-01), Upshaw et al.

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