ASEPTIC LOOSENING OF ISOLATED CEMENTED ACETABULAR CUP.

Introduction:-Total hip arthroplasty has become established as a reliable and successful orthopaedic procedure for the relief of hip pain form Avascular necrosis and arthritic changes to daily routine activities. Over 1 million Total Hip Replacements (THR) performed worldwide each year. About 7-10% underwent a revision THR surgery in that 75% due to aseptic loosening of THR. But isolated acetabular aseptic loosening is very rare. Isolated Acetabular cup loosening is more common in cemented than uncemented cup. Material & Method:- A 54 year old female had complaints of pain over right hip since 45 days and difficulty on walking since 15 days. No discharging sinus and no symptoms of infection. Then xray showed rotation of right side acetabular cup and ct scan done for confirmation showing A 3.5 mm gap seen between cup and acetabulum on right side with loosening and anterior displacement of cup of right side prosthesis. Then patient underwent revision uncemented acetabular replacement and old cup was sent for pus culture and sensitivity which showed no organism. Result:- After followup of 1.5, 3 and 6 months. pt is walking full weight bearing without any complaints of pain and limping. Conclusion:- As aseptic loosening of isolated acetabular cup in cemented THR is very rare cause of revision THR surgery, in this uncemented acetabular cup replacement gives an excellent result and outcome.