Fig. 4.

Evaluating suspected implant malposition: This 48 year old female with rheumatoid arthritis, who has undergone left total hip replacement one and half years back presented with dull aching left hip pain. Anteroposterior radiograph of pelvis with both hips (a)revealed loosening of the acetabular component and superior migration (arrow in a) with periarticular osteopenia. CT scan (b) confirmed the findings and additionally helped assess the extent of acetabular bone loss in specific regions (arrows in b). Post-surgical radiography showing acetabular cup with augmentation using a posterior column buttress (arrows in c) based on planning done on CT scan images.