骨间后神经综合征的临床及肌电图研究

目的：探讨骨间后神经（PIN）受员的临床及肌电图诊断方法。方法：对44例临床疑PIN受损患者作详细的临床检查和肌电图研究。结果：在肱桡肌、桡侧伸腕长肌肌电图及运动神经经传导速度（MCV）均正常。伸指总肌、食指固有伸肌肌电图均有不同程度异常；MCV测定分别有24例（54％）及34例（77％）异常。桡神经浅支的感觉神经传导速度（SCV）均可引出动作电位，其中7例传导速度轻度减慢。结论：肱桡肌、桡侧伸腕长肌无异常，其余前臂伸肌的肌电图改变。部分病例MCV异常，桡神经浅支SCV正常，即可诊断PNI受损。

Clinical and electromyographical study of patients with posterior interosseous nerve syndrome

Objective: To explore the clinical features and electromyographical diagnosis for the posterior interosseous nerve(PIN) injury.Method: Clinical examinations and electromyograms(EMGs) were performed in 44 suspected patients with PIN injury.Result: The EMGs and motor nerve conduction velocities (MCVs) were normal at the brachioradialis and extensor carpi radialis longus in all patients.EMGs were abnormal in various degrees at the extensor digitorum communis and extensor indicis proprius in all patients.The slowings of the MCVs were noted at the extensor digitorum communis in 24 patients (54%) and at the extensor indicis proprius in 34 patients (77%).The action potentials of sensory nerve conduction velocities (SCV) were all elicited at the superfacial branches of the radial nerves,and the slight slowings of the SCVs were detected in seven patients.Conclusion: The PIN injury could be diagnosed if the EMGs of the forearm extensor muscles are abnormal but the brachioradialis and extensor carpi radialis longus,the SCVs of the superfacial branches of the radial nerves are normal, and the MCVs are partly abnormal.