HemiCAP Hip Partial resurfacing Technique. (A) Osteochondral defect in the weight bearing portion of the femoral head. (B and C) The Centre of the defect is identified and a guidewire passed through the centre of the defect into the centre of the femoral head. A Step Drill bit is passed over the guidewire to create space to accommodate the Taper Post of the HemiCAP implant. (D) The defect is mapped and a circular reamer corresponding to the estimated size passed over the guide pin to ensure shape fit with the surrounding cartilage. (E and F) The definitive implant is placed a successful trial to ensure good congruity of the femoral head and seated flush below the surrounding articular cartilage.