Inventors:
Joseph M. Lane - New York NY
Albert H. Burstein - Stanford CT
James C. Otis - Stamford CT
Timothy M. Wright - Stamford CT
Assignee:
New York Society for the Relief of the Ruptured and Crippled,
Maintaining the Hospital for Special Surgery - New York NY
International Classification:
A61F 230, A61F 238, A61F 232
Abstract:
A bone prosthesis for the leg and thigh comprises a distal femoral component that includes a body portion adapted to replace a resected portion of the distal femur and a condylar portion having a spherical surface along its inferior and posterior aspects and an axle hole extending through it in the latero-medial direction at the geometric center of the sperical surface and a proximal tibial component that includes a metal head portion having a cavity opening superiorly and defined by spaced-apart lateral and medial flange portions, each of which has an axle hole. A plastic tibial plateau insert is received in the cavity of the tibial head portion and has a spherical seat matching, receiving and pivotably supporting the femoral condylar spherical surface. A plastic bushing is received in the axle hole of each tibial flange portion, and a metal axle is received in the femoral and tibial axle holes. Clearances between the bushings and the portions of the axle received in the bushings provide latero-medial flexural and axial rotational laxities in the prosthetic joint throughout the range of flexural motion.