<qa>  What is the name of the apex cup?Surgery is performed according to a standard procedure with a postero-lateral approach and following the manufacturers recommendations. During surgery a minimum of 4 Tantalum markers 0.8mm are inserted in the bone of the proximal femur for defining the bone segment in the RSA analysis. All patients receive the same uncemented hemispheric acetabular cup Exceed with a highly cross-linked polyethylene liner. No local analgesic is injected. Physiotherapy begins on the day of surgery and the patients will be mobilized with full weight-bearing using crutches. All patients will get oral anticoagulants according to praxis of the department Xarelto until discharge, and prophylactic antibiotics Dicloxacillin, 2 g preoperatively and 1g x 2 postoperatively during the first 24 hours. 