Osteoarthritis is often associated with joint pain, stiffness and impaired mobility. In case of severe symptoms, the joint may be replaced by a prosthesis. Hip resurfacing is an alternative to the more common total hip arthroplasty. The Swedish Social Insurance Agency (Försäkringskassan) asked what effects and potential complications the Birmingham Hip Replacement (BHR) had for patients with osteoarthritis compared to the traditional total hip arthroplasty. They also asked about the relationship between cost and effect for these treatment methods compared to each other.