A femoral head resurfacing implant 10 is described comprising an external articulating surface 12 and an internal fixation surface 14. A stem 16 projects from the centre of the internal fixation surface 14. The internal fixation surface 14 comprises a top surface 18, surrounding and substantially orthogonal to a long axis of the stem 16, a chamfer surface 20 extending downwardly and outwardly from the top surface 18 and a side surface 22 extending substantially parallel to the long axis of the stem 16. At least one projection 24 is arranged on the internal fixation surface 14 to provide a predetermined gap between the top surface 18 and/or chamfer surface 20 and a resected head 30 onto which the implant is to be fitted. Furthermore, the side surface 18 comprises a cement containment feature to restrict or eliminate outflow of cement from the predetermined gap.
