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INSTRUMENT ASSEMBLY FOR USE IN KNEE JOINT REPLACEMENT SURGERY

  • US 20090138021A1
  • Filed: 09/21/2006
  • Published: 05/28/2009
  • Est. Priority Date: 09/30/2005
  • Status: Active Grant
First Claim
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1. An instrument assembly for use in knee joint replacement surgery, comprising:

  • a base instrument that comprises;

    a tibial plate;

    a femoral plate;

    a tibial arm having a plate end and a control end, wherein the tibial plate is fastened to the plate end of the tibial arm at its anterior edge, and wherein, when the tibial plate contacts the tibia, the tibial arm is configured to extend from the tibial plate generally medially or laterally of the knee joint;

    a femoral arm having a plate end and a control end, wherein the femoral plate is rotatably fastened to the plate end of the femoral arm, and wherein, when the femoral plate contacts the femur, the femoral arm extends from the femoral plate generally aligned with the tibial arm; and

    a distractor mechanism configured to act between the tibial arm and the femoral arm at a point between their respective plate ends and control ends by which the distance between the plate ends of the arms can be adjusted, andan ancillary instrument mountable on the base instrument and configured such that the position of the ancillary instrument relative to the tibial plate is fixed during subsequent steps in the knee replacement procedure, while the knee joint is distracted as a result of forces applied across the joint between the tibial plate and the femoral plate.

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