Measurements were taken for the radiation dose, which shows that the stereo x-ray of the hip provides a very low radiation dose of 0.15 mSv.. DXA measurements of the femur or spine (osteoporosis control) produce an effective dose equivalent to 292 millisievert (milliSv) and a scan around the hip implants produce an effective dose of 146 milliSv (info from General Electric (GE) scanner manufacturer). A conventional radiograph of the hip provides a dose of 0.85 milliSv. Patients, who undergo hip prosthesis surgery outside the protocol in our hospital unit, have one conventional radiograph after surgery and, as of recently, no clinical or radiographic later follow-up due to necessary cuts on budget-costs. Patients in this study have one conventional radiograph post-operatively and one conventional x-ray at 2 years and 5 years follow-up. In total the project patients are subjected to an additional radiation dose of 2 conventional radiographs (1.7 mSv), 1 osteoporosis assessment (0.03 mSv), seven times periprosthetic DXA scans including double measurements (0.1 mSv) and six times the stereo radiography including double measurements (0.9 mSv). Patients included in this study get exposed to an additional radiation dose of 2.73 mSv. This corresponds to approximately 3 conventional radiographs of the hip, and it provides an additional risk of fatal cancer of 0.01%. This places the subjects in group IIb., where the overall risk of the irradiated individual is 1 to 10,000.