Table 4.

Mean values (mm (SD)) of sagital and lateral sway with open or closed eyes in 2-foot standing on a force plate in 19 patients (1-factor ANOVA model)

Parameter	Preoperatively	6 months	2 years	p-value
Sagital sway
Open eyes	4.5 (1.6)	3.9 (1.2)	3.5 (0.7)	0.04
Closed eyes	6.1 (2.6)	4.6 (1.3)	4.6 (1.3)	< 0.001
Lateral sway
Open eyes	3.0 (1.6)	2.4 (0.9)	2.0 (0.7)	0.04
Closed eyes	4.1 (2.2)	2.8 (0.9)	2.6 (1.0)	0.006