Recovery of static posture function after chemical UL. The support surface (expressed in cm2) was evaluated for each rat (n = 4 measurements per rat) at regular time intervals until complete recovery. Each point represents the mean value (± SEM) for each postoperative time calculated in a group of chemical UL rats (n = 6). The mean of support surface preoperative values is shown as a horizontal line and standard error of the mean (± SEM) as two dotted lines. Note the strong increase in surface in the days following chemical UL and the complete recovery after 36 days. According to Bonferroni's principle, P < 0.0038 was considered significant. * P < 0.0038, ** P < 0.00038 versus preoperative values.