Centering jig for resurfacing the head of the femur and method

A centering jig for positioning a prosthetic component for resurfacing a head of a femur, the jig comprising a centering guide defining a centering axis, and being characterized in that it further comprises:

• a support suitable for fitting on the head of the femur and including at least one portion defining an envelope surface forming a portion of a sphere substantially complementary to the head of the femur, the centering guide being fastened to the support on the outside of the envelope surface, with the centering axis aligned on a diameter of the sphere or parallel to a diameter of the sphere;
• and
• at least one abutment arm for coming into abutment against a predefined portion of a neck of the femur, each abutment arm being connected to the support and having a distal end that bears against a corresponding predefined portion of the neck of the femur when the support is fitted on the head of the femur with the centering axis aligned on the central axis of the neck of the femur or with a small amount of valgus relative to the axis.