Instruments for use in the surgical implanation of a knee prosthesis including a femoral alignment rod for insertion into the medulla of a femur through an access hole located between the femoral condyles. The rod is resiliently deformable so that once the rod is fully inserted within the medulla the...http://www.google.com.au/patents/US4791919?utm_source=gb-gplus-sharePatent US4791919 - Surgical instruments
