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US 3,958,278 AGranted
Endoprosthetic knee joint
AssigneeNational Research Development Corporation
InventorsAlan John Clive Lee, Robin Sydney Mackwood Ling
Life of this patent
Estimating the term…
Abstract
An endoprosthetic knee joint device is suited to a unicondylar procedure in which only one compartment of the knee is treated, or a duocondylar procedure, the latter employing a pair of like femoral components and a tibial component having a common platform defining separate recesses for similar pads. In addition the device maximizes the use of advantageous material properties, allows pad replacement in the event of wear, and allows pad thickness selection to correct for varus and valgus deformities.
Claims11
An endoprosthetic knee joint device comprising:
- a femoral component defining an elongate longitudinally-convexly-curved first bearing surface, adapted for securement to the femur to locate said first surface as a femoral condylar surface replacement, and of integral construction from a first material;
- a tibial component base part made of said first material, having a platform portion defining in one major face thereof a recess with undercut side walls, having a clamp member which forms part of said recess and said side walls and is detachable to allow access to said recess, and said platform portion being adapted remotely from said recess for securement to the tibia as a tibial condylar replacement;
- and a tibial component bearing part made of a second material of lesser mechanical stability and strength than said first material, being substantially complementary to but having a thickness greater than the depth of said recess, being releasably captively engaged in said recess by said side walls and said clamp member, and defining remotely from said recess a second bearing surface in mutual articulatory engagement with said first bearing surface.
Dependencies are inferred from the claim text.