Figure 3

The weight-bearing area of the femoral head shows progressive collapse. (A) Anteroposterior plain radiographs and (B) coronal computed tomography (CT) images of the left hip at the time of injury (Injury) show a fracture in the acetabular roof (white arrow), inner wall of the acetabulum (red arrow), and medial articular surface of the femoral head (yellow arrow). The series of images (one month (1M), four months (4M) and five months (5M) after injury) show the progression of collapse in the femoral head (black arrows), with residual displacement of the fracture in the acetabular roof.