Table 1 Acetabular parameters in Japanese adolescents measured on plain radiographs

LCEA (°)

27.9 ± 4.8

29.8 ± 4.6

27.5 ± 5.0

< 0.001

Tönnis angle (°)

5.0 ± 3.7

3.0 ± 3.1

5.4 ± 3.8

< 0.001

Sharp’s angle (°)

44.1 ± 3.1

43.0 ± 3.1

44.3 ± 3.1

< 0.001

AHI (%)

82.1 ± 5.5

82.9 ± 4.9

81.9 ± 5.7

0.035

LS (mm)

5.4 ± 1.4

6.0 ± 1.2

5.3 ± 1.5

< 0.001

VS (mm)

0.3 ± 1.2

0.9 ± 1.5

0.2 ± 1.1

< 0.001

PED (mm)

14.0 ± 2.3

16.1 ± 2.4

13.7 ± 2.0

< 0.001