Fig. 6.

Evaluation of HO: Patient with post traumatic left hip arthritis presented with stiffness and foot drop, AP radiograph of pelvis and both hips (a) shows trans articular screws in situ with deformation of femoral head. severe degenerative changes and periarticular heterotrophic soft tissue ossification. Axial sections of CT scan (b) shows heterotrophic ossification in the posterior aspect of left hip (b)with reduced intermuscular fat plane along course of left sciatic nerve. Post operative radiograph (c)shows-myositis mass excision and implant removal with total hip replacement.