Tibial prosthesis

Details Tibial prosthesis Tibial prosthesis

1986-11-18

1988-09-06

Apley, Richard J.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

A61F 238

Patent

active

047690402

ABSTRACT:
An improved tibial plateau prosthesis is described in which a baseplate is anatomically peripherally shaped and provided with a knife edge perimeter which cuts into the soft tissue outer edge of the epiphyseal shell of the tibia and effectively caps the tibia. Hoop stresses are reduced, and the use of wrought metal for the baseplate, inclusion of a deep intercondylar cut out as well as a series of performations at locations corresponding to positions of hardness of the cancellous bone facilitates flexibility more in tune with the properties of the original subchondral bone plate and cartilage which in turn reduces "lift-off" from an unloaded condyle during loading of the other condyle. Bone ingrowth is encouraged by accurate flat cutting and the provision of the perforations. Initial stability is promoted by the knife edge and its asymmetrical circumferential shape.

REFERENCES:
patent: 3869731 (1975-03-01), Waugh et al.
patent: 4340978 (1982-07-01), Buechel et al.
patent: 4608053 (1986-08-01), Keller
patent: 4662888 (1987-05-01), Field

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