Fig. 4.

Functional evaluation of quadriceps branch reinnervation as assessed using protraction limb ratio (PLR). Evaluation of PLR measurements over time (A) and after normalizing to the extent of injury using the recovery index (B) revealed statistically significant differences at weeks 8 and 15 between collagen and saline treated groups as signified by an asterisk (*). However, no significant differences were found among collagen treated groups at either 8 or 15 weeks post injury. Means are reported +/− standard error. Differences were considered significant at p < 0.05 using one-way analysis of variance.