TABLE 4.

Accuracy of Diagnostic Testing for FAI and Hip Instability^a

Diagnostic Examination	AUC (95% CI)	Standard Error	P Value
FAI (n = 110)
FPAW	0.57 (0.50-0.65)	0.04	.06
FADIR	0.52 (0.49-0.56)	0.02	.21
FPAW + FADIR	0.58 (0.51-0.66)	0.04	.03
Hip instability (n = 54)
FPAW	0.67 (0.59-0.75)	0.04	<.001
FABER	0.7 (0.62-0.77)	0.04	<.001
FPAW + FABER	0.77 (0.69-0.85)	0.04	<.001

^aBoldfaced P values indicate statistical significance. AUC, area under the curve, as calculated by receiver operating characteristic; FABER, flexion abduction external rotation; FADIR, flexion adduction internal rotation; FAI, femoroacetabular impingement; FPAW, foot progression angle walking.