Clinical Study With the seleXys PC and the RM Pressfit Vitamys Cup

Inclusion Criteria: * Patients with symptomatic arthritis who are candidates for a primary total hip arthroplasty with an uncemented femoral stem as determined jointly by the surgeon and the patient. * Patients suitable for an uncemented acetabular component in combination with a 36mm femoral head (seleXys PC cup: 52mm, 54mm or 56mm; RM Pressfit vitamys: 52mm, 54mm or 56mm) * Patients between the ages of 50 and 75 inclusive * Patients who understand the conditions of the study and are willing to participate for the length of the prescribed follow-up Exclusion Criteria: * Patients that require an acetabular cup size which cannot be used in combination with a 36mm femoral head * Patients that offer no guarantee for regular follow-up controls * Patients that have a revision surgery * Patients that have a fracture of the femoral neck or a bone tumour in the area of the femur or pelvis * Patients that had a previous osteotomy of the femur or pelvis * Pregnant women or those seeking to become pregnant * Patients with a history of active infection