Figure 2.

Romberg ratios during (a) quiet stance and (b) vibratory perturbation before surgery (black bars) and after surgery (striped bars). The values represent the mean and the error bars; standard error of mean (SEM). A higher value indicates a larger difference between eyes closed and eyes open conditions, and thus, more visual dependence. According to Bonferroni corrected significant level, the values were not significant, but for consistency reasons are also presented as trends (unbolded).