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INTRODUCTION: Bipolar prosthesis was designed to allow movement in 2 planes ie between acetabulum & outer bearing s & Prosthetic femoral & inner bearing. Hence universal movement takes place at the inter-prosthetic joint (IPJ). Over a variable period of time the bipolar prosthesis becomes unipolar functionally due to stiffening up of inter-prosthetic joint. This study is mainly done to assess the inter-prosthetic joint movement in bipolar prosthesis done for fracture neck of femur at 6months & mid-term follow-up. MATERIALS & METHODS: It’s a 2 part study: Part 1: Included 30 patients who have undergone Bipolar Hemi-arthroplasty for Fracture neck of femur from the period of December 2011 to June 2013. These patients were followed up prospectively with Radiographs at immediate, 6 weeks & 6 months of post-operative period. & IPJ motion was assessed. Part 2: Retrospectively we called 10 patients who had undergone Bipolar H.A 2 years/ or more & repeated the same x-rays. With this we were able to assess IPJ motion at midterm follow-up. RESULTS: In prospective follow-up we appreciated about 28 % of the IPJ motion was preserved . In part 2, about 31 % of IPJ motion was found to be still preserved in these patients. The Oxford hip scores was found to be better in patient’s with good amount of IPJ motion. CONCLUSION: For effective functioning of bipolar prosthesis IPJ movement remains a vital cog in the success of the bipolar prosthesis. In our study we found that good amount of IPJ motion was preserved at 6 months & at mid-term follow-up & functional outcome was also better in patients with IPJ motion > 25%.

Radiological assessment of inter-prosthetic joint movement in bipolar hip hemiarthroplasty for fracture neck of femur