One year postoperative the following examination is carried out in the listed order: HAGOS, baseline characteristics, pain on a VAS scale, pain on a pain drawing, hours of physical activity, ultrasonography, abnormal clinical entities, pain at the conjoint tendon, presence of lumbar and thoracic back pathology, examination of intra-articular pathology, evaluation of internal snapping hip, hip muscle strength. Finally the physical activity sensor is attached and the patient informed.