Fig. 3 | Scientific Data

Fig. 3

From: A dataset for quality evaluation of pelvic X-ray and diagnosis of developmental dysplasia of the hip

Fig. 3

Radiographic classification systems for DDH. (a) Tönnis classification for DDH in children. The circle marks the femoral head ossification center. The SMA line connects the superior outer acetabular margins. The P line runs perpendicular to the SMA line through the outer acetabular edge. (b) IHDI classification for DDH in children. The circle indicates the proximal femoral metaphysis midpoint. The H line spans the inferior iliac borders above the triradiate cartilage. Line D bisects the inferior lateral quadrant formed by H and P lines.

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