A Migration and Bone Density Study Comparing Hi-Fatigue Bone Cement and Palacos Bone Cement

Inclusion Criteria: * primary hip osteoarthritis * sufficient bone quality for total hip arthroplasty * age 71 years and above * no upper age limit if the patient is capable * informed and written consent * patient can only enter the project with one hip Exclusion Criteria: * planned bilateral hip surgery * neuromuscular or vascular disease in the affected leg * preoperatively not found suitable for a hip arthroplasty * patients with osteoporosis based on former diagnosis or preoperative DEXA-scan * fracture sequelae, osteonecrosis or previous extensive hip surgery * patients who cannot refrain from taking NSAID post-operatively * continuous medical treatment with vitamin K antagonists (Warfarin) which is known to reduce the bone mass by a factor of 5 * patients with metabolic bone disease * patients with rheumatoid arthritis * postmenopausal women in systemic estrogenic hormone substitution * patients with a continuous need of systemic cortisone treatment * non-Danish citizenship * patients who do not comprehend the Danish language (read and speak) * senile dementia * alcoholism - defined as men drinking more than 21 units a week and women drinking more than 14 units a week * drug abuse * major psychiatric disease * metastatic cancer disease and treatment with radiation therapy or chemotherapy * severe systemic disease (e.g. hemi paresis and Parkinson disease) * systemic hip and spine disease * employee at the orthopaedic department, Aarhus University Hospital * ongoing case regarding industrial injury insurance of the knee * patients with poor dental status (risk of infection)