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

Figure 1.

Figure 1

Anteroposterior pelvic radiograph of an infant with right DDH. (A) The right hip was classified as a Tonnis grade III hip and the left hip was classified as a Tonnis grade I hip. The yellow point represented the center in ossific nucleus of femoral head. The right yellow point is located in the lower part of external upper rim of acetabulum but near with the SMA-line, whereas the left yellow point is medial to the P-line. (B) The right hip was classified as an IHDI grade III and the left hip was classified as an IHDI grade I. The yellow point represents the H-point which is defined as the midpoint of the superior margin of proximal femoral metaphysis. 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.