Assessment of Implant Fixation and SF-36 for Short Hip-Stems - A Prospective Clinical Study

Inclusion Criteria: * Subject required primary total hip arthroplasty unilateral or bilateral with a diagnosis of primary and secondary coxarthrosis, dysplasia coxarthrosis and post-traumatic necrosis of the femoral head confirmed by x-ray analysis. For bilateral subjects at least three months between surgical procedures were required. * Subject was willing to consent to participate in the study and planned to be available for the follow-up examinations. * Subject had normal motor function of the lower extremities, documented through clinical examinations and lack of signs of a neurological disease with changed motor function. * Subject was 30 to 65 (inclusive) years of age at time of surgery. Exclusion Criteria: * Subject had previous bone or soft tissue surgery of the affected hip except for arthroscopic surgery. * Subject had a local or systemic infection. * Subject had previously diagnosed osteoporosis. * Subject had a femoral neck angle of \>145°. * Subject had a femoral neck angle of \<125°. * Subject had a disease of the cardiovascular system involving particularly reduced load capacity in the everyday life, counting as contraindication of physical stress (American Society of Anaesthesiologists' (ASA) Score 3 or 4). * Subject had a documented allergy against elements of the implanted device. * Subject had a neurological disease with changed motor function. * Subject was pregnant. * Subject had a Body Mass Index (BMI) \> 30. * Subject suffered from alcoholism or addictive disorders. * Subject needed a revision hip arthroplasty. * Subject had an insufficient command of the language to understand patient information and consent.