Table 2.

Comparison of cup positioning (inclination and anteversion) between both sides

	Group A (n = 210) (dominant, right THA)	Group B (n = 210) (nondominant, left THA)	P-Value
Inclination (in degrees)
Mean ± SD	40.1 ± 6.3 (21.8–60.3)	38.2 ± 6.1 (23.4–63.4)	0.002*
Lewinnek et al
▪  Within safe zone (30–50)	189 (90.0%)	187 (89.0%)	0.750**
▪  Outside safe zone	21 (10.0%)	23 (11.0%)
Callanan et al
▪  Within safe zone (30–45)	155 (73.8%)	164 (78.1%)	0.304
▪  Outside safe zone	55 (26.2%)	46 (21.9%)
Anteversion (in degrees)
Mean ± SD	11.7 ± 4.4 (2.0–26.8)	11.8 ± 4.7 (2.0–27.1)	0.950*
▪  Within safe zone (5–25)	198 (94.3%)	194 (92.4%)	0.434**
▪  Outside safe zone	12 (5.7%)	16 (7.6%)

Data were expressed as frequency and % or mean ± SD (range); Bold P-value indicates statistically significant

^*Independent Sample T-test compares the mean difference between both groups

^**Chi-square test compares proportions between both groups