Intraoperatively, simple AP radiographs of the pelvis were obtained with the child in the supine position. Care was taken to position the child with the legs parallel and to avoid rotation of the pelvis and hips. The first radiograph was taken after the reduction of femoral head, Salter osteotomy, depleting the acetabulum of pulvinar fat and releasing the transverse ligament, just before capsulorrhaphy. The second radiograph was taken just after capsulorrhaphy. Having considered a magnification marker (surgical blade), we measured the distance between the inferomedial edge of the proximal femoral metaphysis and the lateral edge of the obturator foramen (Fig. 1). This distance was used as a surrogate measure to quantify the extent to which femoral head was deeply seated within the acetabulum.

Schematic drawing of the medial hip joint space. [This illustration is the sole work of the corresponding author (F.V.), presented for the purpose of publication in the current study]

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