Total hip replacement(THR) in Old Fracture Dislocation of Hip 58 years old gentleman presented to us with complains of pain around left hip and difficulty in walking. He had a history of road traffic accident 1 years back and sustained fracture dislocation of left hip, for which he had undergone Open Reduction Internal Fixation elsewhere. Now he had developed secondary osteoarthritis of hip with dislocated head and shortening of left leg. He has undergone uncemented Total hip replacement at Sant Parmanand Hospital. Intraoperatively posterior acetabular wall defect was reconstructed using bone graft and fixed with screws. He has regained his normal leg length and his walking comfortably without any support and pain free.