2) Konishi N, Mieno T. Determination of acetabular coverage of the femoral head with use of a single anteroposterior radiograph. A new computerized technique. J Bone Joint Surg 1993; 75-A: 1318-1333.
3) Johnston CE 2nd, Wenger DR, Roberts JM, et al. Acetabular coverage: three-dimensional anatomy and radiographic evaluation. J Pediatr Orthop 1986; 6: 548-558.
4) Helfi F. Spherical assessment of the hip on standard AP radiographs: a simple method for the measurement of the contact area between the acetabulum and femoral head and of acetabular orientation. J Pediatr Orthop 1995; 15: 797-805.
5) Tannast M, Mistry S, Steppacher SD, et al. Radiographic analysis of femoroacetabular impingement with Hip2Norm-reliable and validated. J Orthop Res 2008; 26: 1199-1205.