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Abstract

A surgical instrument and kit including it, for use to carry out a cone-shaped sub trochanteric rotational osteotomy. The instrument has a guide that is fixed to a cervical screw which has been previously inserted into the femoral head along the axis of the cone to be cut. A drill bit driven in rotation about its own axis passes through the guide in an oblique hole extending at an angle equal to half the angle of the cone to be cut. The drill bit penetrates the lateral wall of the femur as close as possible to the cervical screw. Cutting of the cone is achieved by lateral displacement of the drill bit in a circular motion, which is progressively enlarged as the bit moves forward. In addition to the instrument, the kit contains a chisel with cutting wings, which is insertable in the cervical screw to allow the wings to make slits in the bone. Once the bone is cut and the guide and drill bit have been removed, the ill weight-bearing zone of the patient's femoral head is rotated and replaced by a healthy zone of the femoral head. This kit also has a compression plate which is insertable on the cervical screw and simultaneously in the slits done by the cutting wings of the chisel. This compression plate is used to fasten the femoral head to the femur in its new position.

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First Claim