An RSA and DEXA Study on Migration of Proximal Interphalangeal (PIP) Joint Prostheses of the Hand

Inclusion Criteria: * Patients with osteoarthrosis of the PIP joints. * Patients with sufficient bone quality for implantation of a non-cemented prosthesis. This is estimated by the surgeon preoperatively. * Informed written patient consent. * Patients must read and understand Danish. Exclusion Criteria: * Patients with neuromuscular or vascular diseases in the affected upper extremity. * Patients who, preoperatively, are found to have unsuitable bone quality for un-cemented arthroplasty fixation, for instance bone cysts not visible on x-ray. * Patients who cannot refrain from taking non-steroidal anti-inflammatory drugs (NSAIDs) postoperatively including cox-2 inhibitors. * Patients with previously diagnosed osteoporosis. * Women who are pregnant or are at risk of getting pregnant during the time of investigation. * Patients with rheumatoid arthritis.