Data obtained from motor and sensory functions at each time point as well as electromyographic activity between different groups were analyzed utilizing two-way analysis of variance (ANOVA). The histomorphometric, immunostaining data, densitometry, and electron microscopic data were analyzed using one-way ANOVA. In both tests, ANOVA was followed by post hoc Bonferroni’s multiple comparison tests. Data were presented as the mean ± SEM and a significance level of .05 was predetermined for all statistical analysis.