Table 4. Comparison of the diagnostic threshold, sensitivity, specificity, and AUCs of IFI in different positions.

Item	Diagnostic threshold (mm)	Susceptibility	Specificity	AUC	95% confidence interval
					Lower limit	Upper limit
IFS
Supine with adduction	<16.0	0.884	0.806	0.909	0.862	0.957
Adduction with 30° external rotation	<13.5	0.783	0.791	0.862	0.801	0.922
30°internal rotation	<28.0	0.855	0.761	0.846	0.779	0.913
Supine with 30° flexion	<50.2	0.783	0.746	0.773	0.693	0.853
Prone with 30° backward extension	<12.3	0.826	0.881	0.901	0.850	0.953
QFS
Supine with adduction	<10.9	0.884	0.836	0.909	0.858	0.960
Adduction with 30° external rotation	<10.3	0.739	0.821	0.820	0.750	0.891
30° internal rotation	<20.0	0.797	0.806	0.842	0.773	0.910
Supine with 30° flexion	<38.9	0.493	0.851	0.695	0.607	0.783
Prone with 30° backward extension	<8.8	0.797	0.910	0.923	0.880	0.965

AUC, area under the curve; IFI, ischiofemoral impingement; IFS, ischiofemoral space; QFS, quadratus femoris space.