Abstract: An acetabular component (10) for hip surgery has an outer convex surface for location in the acetabulum and an inner concave bearing surface (16) suitable for holding and bearing against a corresponding femoral head component, without need for an interposed liner. The outer convex surface and the inner concave surface define between them an integral wall (14) of the component. Screw holes (18) are provided though the wall, from the inner concave bearing surface to the outer convex surface for screw fixation of the component in the acetabulum.