the relationship between s1 radiculopathy

background: s1 radiculopathy is a high prevalence illness and its early diagnosis is of crucial importance. several reports have revealed the efficacy of magnetic stimulation in diagnosis of this condition. we conducted this study to compare mmep latency and mmep amplitude in patients with s1 radiculopathy and healthy controls in shohadaye tajreash hospital in 2007. materials and methods: this historical cohort study investigated 31 patients with s1 radiculopathy (according to clinical history and physical examination) and 33 healthy controls. h-reflex, mmep latency and mmep amplitude were evaluated in both groups. patients and controls were not informed about the type of study and performers were unaware of the participants condition. results were analyzed using statistical tests. results: there was not significant difference between cases and controls regarding age and sex. mean mmep latency was 15.23±2.47ms and 13.42±1.6ms in patients and controls, respectively (p<0.05) and mean mmep amplitude was 0.55±0.53µv and 1.29±1.22µv in patients and controls, respectively (p<0.06). we found abnormal mmep latency in 12.2% of controls and 48.4% of patients (p<0.005) and abnormal mmep amplitude in 87.9% of controls and 100% of patients (p<0.06). conclusion: mmep latency seems to be efficient in diagnosis of s1 radiculopathy. a study with a precise diagnostic design is recommended.