The work of Sloof, Ling and Gie has established allografting as a modern technique in revision total hip arthroplasty. The use of allograft enhances the local bone stock and provides a secure fixation for cemented components. Its association with the problem of heterotopic ossification has not been previously considered.

The records and x-rays of 114 patients after revision hip surgery were reviewed. All had been operated upon by three Consultant Orthopaedic Surgeons using standard techniques.

35 patients had undergone revision with impaction allografting of both the femur and acetabulum, 29 had allografting of the femur only, 18 of the acetabulum alone and the final 32 patients (acting as controls) had cemented revision arthroplasty without impaction allografting. Fresh frozen allograft was used in all cases and prepared using a bone mill.

No patient was given radiation or Indomethacin after their revision surgery, even if they had pre-existing heterotopic ossification.

The immediate pre-operative x-rays and x-rays at least a year post-revision were assessed independently by a musculoskeletal radiologist. He was blinded to the type of revision procedure and graded the heterotopic ossification according to the Brooker Classification.

Our results report the incidence of heterotopic ossification after revision hip arthroplasty with fresh frozen allograft when compared with cemented revision arthroplasty from our unit and other studies.