Table 1.

Translation of the femoral head center of rotation as calculated by average root mean square of the difference of co-ordinate between external rotation and internal rotation at 2.5 Nm torque. Units in mm.

	10° Extension	0° Flexion	30° Flexion
Intact capsule	0.8 ± 0.2	0.8 ± 0.2	1.0 ± 0.5
Interportal capsulotomy	1.2 ± 0.4	1.0 ± 0.1	1.5 ± 0.9
T-capsulotomy	1.9 ± 0.3	2.1 ± 0.5	2.3 ± 0.8
Reproduced interportal capsulotomy	1.2 ± 0.6	1.3 ± 0.4	1.2 ± 0.5
Extended interportal capsulotomy	1.6 ± 0.9	1.9 ± 0.8	2.0 ± 1.1
Extended T-capsulotomy	2.9 ± 0.9	2.6 ± 1.0	2.7 ± 0.9