Hip dislocation can be accompanied by fractures, or soft tissue injury not visible with X-ray
Hip dislocation (dislocation of the femoral head from the acetabulum) is most frequent following total hip replacement (THR). Dislocation is usually in a posterior direction which clinically leads to leg shortening, with flexion and internal rotation at the hip (note - hip fractures usually cause external rotation).
Hip dislocation may be accompanied by fracture of the acetabulum, or significant soft tissue injuries not visible with X-ray.
Anterior-Posterior (AP) pelvis and Lateral hip. Both views should be carefully viewed to look for an accompanying fracture of the acetabular rim.