Table 2.

Increasing angles via the posterior approach from the obturator externus to the piriformis. The muscle name indicates the increased angle measured after muscle resection. The data are presented as averages ± standard deviations

	Obturator externus	Inferior gemellus	Obturator internus	Superior gemellus	Piriformis	Ischiofemoral ligament
Hip flexion 0°	1.6° ± 2.2°	2.4° ± 1.6°	3.2° ± 3.0°	5.3° ± 2.9°	4.5° ± 4.1°	10.5° ± 3.1°
Hip flexion 30°	0.8° ± 2.9°	1.9° ± 3.4°	4.7° ± 4.2°	4.8° ± 3.7°	3.3° ± 5.9°	18.1° ± 4.8°
Hip flexion 60°	0.6° ± 3.4°	1.5° ± 2.5°	3.2° ± 4.0°	2.9° ± 5.6°	1.8° ± 5.6°	13.3° ± 10.9°