A radiostereometry assessment of bone graft in hip revision surgery

INTERVENTION: A prospective study is being carried out on 50 patients undergoing impaction revision of the acetabulum for aseptic loosening of primary total hip replacement for osteoarthritis. Patients are randomised to impaction using standard fresh frozen allograft or processed bone. Radiostereometry is used to measure the movement of the cup in terms of migration and rotation over a two year follow up period. Increased migration will imply poorer incorporation of bone graft and hence a significant change in either biological or mechanical properties. CONDITION: Revision Hip replacement surgery ; Musculoskeletal Diseases PRIMARY OUTCOME: Migration and inducible movement of cemented acetabular components impacted. Each patient will be evaluated using standard weight bearing and non‐weight bearing RSA radiographs at time of discharge, at six weeks, three months, six months, one year and two years after surgery. In addition, each patient will receive one repeat examination for clinical precision estimate in accordance with RSA guidelines. SECONDARY OUTCOME: 1. Joint function, assessed using the Oxford Hip Score before surgery and again 12 months after surgery; 2. General health,assessed using the Euroquol 5D score before surgery, 12 months after surgery and 24 months after surgery; 3. Assessment of a hip arthroplasty via plain x‐ray ‐ radiolucency before surgery, just after surgery, then again at 12 months and 24 months INCLUSION CRITERIA: 1. Age 50‐80 2. First revision of cemented THR 3. Acetabular defects suitable for Impaction grafting