Importance

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Abstract

A tibial prosthesis includes a base support member, a bearing surface member, a stabilizer insert support, and a shoulder screw. The base member has a centrally located proximally flared protrusion or rail which extends substantially from the anterior edge of the base support member to the posterior edge of the base support member and defines a pair of substantially parallel dovetail coupling edges. An upstanding posterior stop is located on the upper surface of the rail adjacent its posterior edge and a posteriorly angled screw hole is provided in an anterior portion of the rail. The bearing member has a lower distally tapered recess or groove, dimensioned to receive the rail on the base member, and a posterior stop receiving recess for permitting the posterior stop on the base member rail to engage the insert support. A hollow upstanding stabilizer is formed on a central portion of the bearing member and a hole is provided anterior of the stabilizer. The stabilizer insert support is generally L-shaped and dimensioned to fit inside the hollow stabilizer portion of the bearing member. The base of the stabilizer insert is provided with a counterbored hole to be engaged by the shoulder screw which is placed through the screw receiving holes of the bearing member and the base member and engaged by threads in the base member.

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First Claim