Ceramic femoral resurfacing head prosthesis

A femoral resurfacing head prosthesis system for selective engagement of a femoral resurfacing head prosthesis with a resected femur based on at least one characteristic of the resected femur, the femoral resurfacing head prosthesis system comprising:

• a first group of ceramic femoral resurfacing head prostheses, each ceramic femoral resurfacing head prosthesis of the first group having
• a first convex outer contact surface with a predetermined geometry which is different to the others within the first group, the first convex outer contact surface adapted to be engaged with at least any one of an acetabulum of a patient and an acetabular cup prosthesis;
• a first inner fixation surface adapted to be engaged with a femur of the patient;
• and
• a first stem projecting from the first inner fixation surface, the first stem having a cylindrical body portion and a first lateral extent adapted to be received by a stem bore, and a first longitudinal extent,
• wherein the first lateral extent is constant across the first group along a majority of the first longitudinal extent;
• and
• at least a second group of ceramic femoral resurfacing head prostheses, each ceramic femoral resurfacing head prosthesis of the second group having a second convex outer contact surface with a predetermined geometry which is different to the others within the first and second groups, the second convex outer contact surface being engagable with an acetabulum of a patient or an acetabular cup prosthesis;
• a second inner fixation surface adapted to be engaged with a femur of the patient;
• and
• a second stem projecting from the second inner fixation surface, the second stem having a cylindrical body portion and a second lateral extent adapted to be receivable by a stem bore, and a second longitudinal extent,
• wherein the second lateral extent is constant across the second group along a majority of the second longitudinal extent;
• one said ceramic femoral resurfacing head prosthesis from the first or second groups being selectively engagable with the resected femur based on the one or more characteristics thereof.