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Abstract

An intramedullary bone prosthesis to be rigidly cemented into position in the femur, and also applicable to total knee and shoulder replacement operations, is provided as an improved surgical technique. The prosthesis is composed of a femoral head base, a femoral head post, a long femoral stem, a cement canal along its longitudinal axis, a spacer, a collar, and a distal restrictor. The prosthesis is placed into the prepared medullary canal. With collar in position, a bone cement injector is readily threaded on to the proximal portion of the cement canal. Cement is injected and subsequently travels down through the canal, through the spacer, and eventually exits openings at the bottom of the spacer. The distal restrictor plug halts downward cement travel, thus initiating an upward, retrograde filling of the void in between the prosthesis and the cancellous bone wall. The cement reaches the collar or cement restrictor, thus proximally dislodging all air bubbles, blood, and blood products. Finally, during curing, the cement is constantly and evenly pressurized by means of the cement injector, and excellent cement interdigitation is achieved.

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First Claim