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. 2017 Jan 20;96(3):e5902. doi: 10.1097/MD.0000000000005902

Figure 2.

Figure 2

Anteroposterior pelvic radiograph of an infant with bilateral DDH. (A) The right hip was classified as a Tonnis grade II hip and the left hip was classified as a Tonnis grade IV hip. The yellow point represents the center in ossific nucleus of femoral head. The right yellow point is lateral to the P-line but below the SMA-line, whereas the left yellow point is above the SMA-line. (B) The right hip was classified as an IHDI grade III and the left hip was classified as an IHDI grade IV. The yellow point represents the H-point. The horizontal/vertical/oblique purple lines respectively represent the H-line/P-line/D-line. DDH = developmental dysplasia of the hip, D-line = diagonal line, H-line = Hilgenreiner's line, IHDI = International Hip Dysplasia Institute, P-line = Perkin's line, SMA-line = superolateral margin of the acetabulum lines.