Radiological Incidence of Asymptomatic Heterotopic Ossification after Hip Replacement - The Possible Influence of Femoral Offset Changes on Heterotopic Ossifications Grade

Abstract

We report a clinical, longitudinal and analytical cohort study, ambispective nature, trying to highlight the relationship between different aspects of hip arthroplasty and heterotypic ossification’s grade. We also tried to show the radiological asymptomatic incidence of heterotopic ossification on pelvis X-rays in patients with hip replacement. From a total of 1076 pelvis X-rays performed during the six months of study, a number of 289 patients had hip arthroplasty, the incidence of asymptomatic heterotypic ossification after hip arthroplasty and detected radiologically in varying degrees was 17%. Uncemented screwed cup type, bilateral arthroplasty, postoperative reduced mobility of the hip , X-rays performed at less than 3 years after operation and increased postoperative offset are all risk factors for high grade of heterotopic ossifications compared to the protective role of NSAIDs.