Clinical Application In Diagnosis Of Brachial Plexus Avulsion By MRI

【Objective】:To evaluate magnetic resonance myelography in diagnosing brachial plexus preganglionic injury and to investigate the value of MRI in clinical application.【Materials and Methods】:45 patients who presented with brachial plexus injuries underwent MRI scanning with several sequences before operation. MRI imaging was obtained by GE Signa EXCITE1.5T scanner. All of patients had carried out exploration of the supraclavicular Plexus and intraoperative electrophysiology exam. Images of MRI were reviewed with surgical findings and electromyogram diagnosis. To evaluate the value of diagnosis in brachial plexus preganglionic injury by MRI.【Results】:There were 225 pair nerve roots in 45 patients. Among the 169 pair preganglionic injured roots, MRI imaging detected 147 pair. The sensitivity, specificity and accuracy of MRI in diagnosing brachial plexus preganglionic injury were 87%,83.9% and 86.2%, respectively. The positive predictive value and negative predictive value were 94.2 % and 31.9%, respectively. However there is not significant correlation between the accuracy of MRI examination and duration from the time of injury to the time of diagnosis.【Conclusion】:The capability of MRI to evaluate lesion of each root is different, Imaging and electromyogram may complement each other. MRI can distinctly manifest the nerves within and our of the vertebral canal, thus, help making a correct diagnosis in brachial plexus preganglionic injury and making references for early diagnosis. However, MRI can help to formulate treatment protocols and improve the prognosis of the brachial plexus preganglionic injury.