Bristol-myers Squibb Compnay

John D Cooper

Rodney L Bays

Kevin S Cook

Lisa K Schroder

Michael Anderson

Paul Hickey

An orthopaedic instrument for comparing post-surgical joint geometry to pre-surgical joint geometry. The instrument has a head chuck which can be secured to the ball of a ball joint, and an arm having reference indicia thereon. Markings indicative of the pre-surgical joint geometry are made on the bone with reference to the center of the ball. After replacement with a prosthetic ball, the post-operative geometry is verified by securing the head chuck to the prosthetic ball, and comparing the location of the bone markings against the reference indicia on the arm. As needed, adjustments are made in the prosthetic components.

Head center instrument and method of using the same

An orthopaedic instrumentation assembly for preparing a bone to receive an orthopaedic implant includes a rasp which is insertable within an opening in the bone and has an attachment end with a projection extending therefrom. A handle is attached to the projection. A cutting guide has a first leg and an adjoining second leg. The first leg is attached to the rasp and/or handle adjacent to the attachment end. The second leg is disposed at an obtuse angle relative to the first leg to thereby lie adjacent to the bone. The second leg includes at least one visual indicia thereon for marking the bone

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Bilogla Plateau, Australia

John D Cooper