Injury of the Anterior Branch of Axillary Nerve after Traumatic Posterior Dislocation of the Shoulder |
Jong Moon Kim, M.D., Jeong Shin Myoung, M.D., Soon Yeol Chong, M.D., , Jin Sang Chung, M.D., |
Department of Rehabilitation Medicine, College of Medicine, Kon-kuk University |
견관절의 후방탈구에 의한 액와신경 전방분지의 손상 |
김종문, 명정신, 정순열, 정진상 |
건국대학교 의과대학 재활의학교실 |
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Abstract |
Axillary nerve is commonly injured in the fractures of dislocations of the shoulder joint. This nerve is divided into two branches: one is anterior and the other is posterior branch. The anterior branch of axillary nerve innervates the anterior and middle portion of deltoid and the posterior branch innervates the posterior portion of deltoid and teres minor muscles, respectively. The electromyography(EMG) is the best diagnostic method of axillary nerve injuries. EMG abnormalities confined to the teres minor and deltoid help establish an axillary nerve injuries. The differential diagnosis between injuries of the anterior and the posterior branch is important for understanding the mechanisma of injury, eatablishing the treatment plans and prediction the prognosis. The following case represents a peripheral neuropathy involving the anterior branch of axillary nerve after traumatic posterior dislocation of the shoulder joint with fracture of the glenoid rim of the scapula. We experienced interesting findings-EMG abnormalities in anterior and middle portion of deltoid, in spite of normal findings in teres minor. We believe that isolated injury of the anterior branch of axillary nerve is rate, even though there are many cases for axillary nerve injuries. We concluded that EMG should be undertaken separately to each portions of deltoid(anterior, middle and posterior portions) for the diagnosis of the isolated injuries of axillary nerve branches. |
Key Words:
Anterior branch of axillary nerve, Deltoid muscle, Posterior dislocation of shoulder |
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