Zimmer Gmbh

Roger R Kenyon

Jeffrey M Ondrla

Perry A Geremakis

Ted L Dock

Donna L Campana

Mark D Landes

A rasp-like instrument for forming a cavity in the intermedullary passage of a femur for the implantation of a femoral stem prosthesis. The rasp includes a detachable extension end which can be removed when the rasp is used to form the cavity for the primary implant stem and connected to provide a deeper cavity for the revision implant stem.

Intermedullary rasp with detachable extension end

The system and instrumentation of this invention provides a torque wrench adapter for the femoral rasp and for the hip stem implant. Each adapter includes a shaft for connecting a motion indicator thereon. The motion indicator includes a port for accepting the shaft of either the rasp adapter or the implant adapter and an indicator needle which is linked through spring mechanisms to shiftable leg. In use, the leg is anchored at one end to the femur such that the leg moves with the femur and relative to the indicator housing which causes a deflection in the indicator needle to apprise the surgeon of small movement of either the rasp or the implant relative to the femur.

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Warsaw, IN, United States of America

Roger R Kenyon