Validity and test-retest reliability of manual goniometers for measuring passive hip range of motion in femoroacetabular impingement patients.

Table 3 Test-retest reliability of the goniometer and ETS for hip ROM measurement in patients with FAI and healthy subjects

	ICC_2,1		CV (%)		SEM (°)		LOA (°)
	Gonio	ETS	Gonio	ETS	Gonio	ETS	Gonio	ETS
Flexion	0.916	0.943	3.12	2.66	3.94	2.96	0.72 ± 11.15	0.27 ± 8.42
Abduction	0.924	0.947	5.84	5.66	2.36	2.01	0.14 ± 6.67	-0.08 ± 5.72
Adduction	0.842	0.823	6.73	6.34	2.36	1.59	-0.54 ± 6.60	1.07 ± 4.01
Internal rotation	0.950	0.902	7.74	10.19	2.42	2.93	-0.24 ± 6.89	1.32 ± 7.90
External rotation	0.914	0.934	5.23	5.10	2.53	1.81	0.02 ± 7.16	0.25 ± 5.14

ETS: electromagnetic tracking system, ROM: range of motion, FAI: femoroacetabular impingement, ICC: intraclass correlation coefficient, CV: coefficient of variation, SEM: standard error of measurement, LOA: limits of agreement, Gonio: goniometer. Note that bias (retest lower than test) was significant only for adduction measured with the ETS (P < 0.01).

ISSN: 1471-2474