Fig. 2. Nerve injury score for sections obtained 7 days after intrathecal administration of a commercially available, preservative-free solution of 3% chloroprocaine HCl (Chloro) containing 0.33% NaCl (n = 27); a commercially available solution of 3% chloroprocaine HCl containing 0.18% sodium bisulfite and 0.21% NaCl (n = 26); or preservative-free normal saline (n = 14). Nerve injury scores were based on all fascicles present in a cross section 12 mm caudal to the conus medullaris. Each fascicle was assigned an injury score of 0–3, where 0 = normal, 1 = mild, 2 = moderate, and 3 = severe. The injury score for each animal was calculated as the average score for all fascicles in the section. Data represent mean ± SEM. *P < 0.05 versus all other groups; **P < 0.05 versus saline.