111 patients experiencing symptoms of classic or probable carpal tunnel syndrome (CTS) with failed wrist splinting treatment, were randomized to evaluate the long-term, dose-response efficacy of 80mg and 40mg of methylprednisolone injections on symptom severity and rate of surgery, over a 1 year period. The use of methylprednisolone of either dose demonstrated superior improvements in symptom severity at 10 weeks compared to placebo but no significant differences were found after 1 year. Rates of surgery were 73%, 81%, and 92% for 80mg, 40mg and placebo patients respectively.