Sensitivity, specificity, accuracy, positive predictive value and negative predictive value for diagnosis of pre-nodal lesions were 89.7%, 93.2%, 92.3%, 81.3% and 96.5% respectively; diagnosis of postganglionic nerve root rupture were 78.7%, 89.8%, 84.7%, 86.7% and 83.2% respectively; diagnosis of nerve root neuroma were 92.6%, 84.3%, 87.2%, 75.6% and 95.6% respectively.