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Anteroposterior pelvis films showing the anatomic deformation of dysplastic hips. h - the vertical height from the reference line (through the radiographic teardrops) to the femoral head-neck junction, H - the vertical height of the pelvis, the vertical height of the true acetabular = 1/5H. The “degree of subluxation” is then calculated as percentage subluxation= [(the amount of vertical subluxation)/(the vertical height of the true acetabulum)] ×100.
