Interobserver and Intraobserver Reliabilities of Three-Dimensional Postoperative Evaluation Software in Total Hip Arthroplasty

Table 3

Interobserver and intraobserver reliabilities for alignment measurement.

		Average (SD)	Intraobserver reliability (CI)	Interobserver reliability (CI)
				A1-B	A1-C	B-C
Cup	RA	17.6 (4.3)	0.972 (0.933–0.989)	0.978 (0.943–0.991)	0.970 (0.915–0.989)	0.982 (0.955–0.993)
	RI	36.6 (3.8)	0.955 (0.893–0.982)	0.898 (0.765–0.958)	0.965 (0.913–0.986)	0.892 (0.753–0.956)
Stem	Anteversion	27.6 (13.1)	0.993 (0.984–0.997)	0.999 (0.998–0.999)	0.999 (0.997–1.000)	0.999(0.997–0.999)
	Varus–valgus angle	−1.2 (1.7)	0.956 (0.894–0.982)	0.987 (0.877–0.995)	0.991 (0.977–0.996)	0.995 (0.988–0.998)
	Flexion–extension angle	1.8 (2.3)	0.991 (0.980–0.997)	0.994 (0.985–0.998)	0.995 (0.986–0.998)	0.997 (0.992–0.999)

SD, standard deviation; CI, 95% confidence interval; RA, radiographic anteversion; RI, radiographic inclination.