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KMID : 0361419950190010179
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Journal of Korean Academy of Rehabilitation Medicine
1995 Volume.19 No. 1 p.179 ~ p.184
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Injury of the Anterior Branch of Axillary Nerve after Traumatic Posterior Dislocation of the Shoulder-A case report-
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Ahn Tae-Seok
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Abstract
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Axillary nerve is commonly injured in the fractures or 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 mechanisms of injury, establishing the treatment plans and
predicting 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 rare, 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.
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KEYWORD
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