TABLE 3.

Cliff Sign Measurement Results and Interobserver Reliability^a

Measurement	Patients With Microinstability	Patients Without Microinstability	P Value	Interobserver Reliability (n = 3)
Cliff sign, %	89	27	<.0001	0.81 (excellent)
Cliff angle, deg	37.0 ± 11.7	34.8 ± 9.1	.54	0.84 (excellent)
Reverse alpha angle, deg	72.1 ± 12.0	73.5 ± 8.5	.70	0.71 (good)
Cliff/femoral neck Cobb angle, deg	45.3 ± 11.0	40.5 ± 8.0	.14	0.16 (poor)
Cliff/femoral shaft Cobb angle, deg	5.2 ± 9.7	6.4 ± 7.6	.67	–0.31 (poor)
Cliff length/femoral head diameter ratio	0.17 ± 0.07	0.17 ± 0.09	.98	0.31 (poor)

^aBolded value indicates statistical significance.