Bioball universal modular neck adapter as a salvage for failed revision total hip arthroplasty
A 70 year old female was operated for left femoral neck fracture with THA using metal on metal prosthesis (ASR). 1 year later she developed aseptic loosening and a peri-prosthetic fracture of the femur, which was revised with fully coated stem (Solution System, Depuy International Ltd., UK) and cerclage wires []. Ten weeks after the surgery, on weight bearing, the stem subsided and the hip dislocated []. Because maximum size of the femoral neck was already used in the first surgery, the acetabular liner was changed to a constrained liner. But, after 1 month of the surgery, the neck got dislodged from the stem []. Version was found changed intraoperatively. This difficult hip with recurrent dislocation was salvaged using the bioball neck adapter and the version was restored. At 2 years followup, the fracture has united and the patient is pain free and mobile, with no further episode of dislocation []. There was no thigh or trochanteric pain till the last followup.