Elevated concentrations of the lipid peroxidation product malondialdehyde (MDA) were detected in the ipsilateral (A) hindpaw skin, (B) gastrocnemius muscle, and (C) sciatic nerve at 4 weeks after tibia fracture/cast. Four weeks treatment with Vit C inhibited the post-fracture/cast increase in MDA levels in skin, muscle and sciatic nerve. Intraperitoneal injection of the antioxidant NAC at 4 weeks post fracture also inhibited the increase in MDA in skin and sciatic nerve. Data are expressed as mean values ± SEM and analyzed using one-way ANOVA followed by post hoc Newman-Keuls multiple comparison testing (n=7 per cohort). *P < 0.05, **P < 0.01 and ***P < 0.001 vs. nonfracture Controls treated with vehicle; #P < 0.05, ##P < 0.01 and ###P < 0.001 vs. FX/Cast treated with vehicle.