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KMID : 0361419940180040795
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Journal of Korean Academy of Rehabilitation Medicine
1994 Volume.18 No. 4 p.795 ~ p.800
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Partial Median Nerve Injury at Midshaft of Humerus that Mimicks Anterior Interosseous Syndrome
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Abstract
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We present a case which was partial median nerve lesion at supracondylar level of humerus that mimicks anterior interosseous syndrome clinically. The lesion was caused by blunt trau ma of right arm due to traffic accident 6 months before the
examination. It is characterized by weakness of muscles innervated by the anterior interosseous nerve branch of the median nerve as well as other more proximal median nerve innervated muscles, namely, the pronator teres, flexor carpi radialis and
flexor
digitorum sublimis. but other median nerve innervated distal hand muscles were not involved. Sensitbility was intact. Electrodiagnostic study revealed fibrillation potentials and positive sharp waves at rest and absent of reduced recruitment
patterns in
muscles above mentioned. Routine sensory and motor conduction velocity of upper extremities was within normal limits, except a half amplitude of compound muscle action potential of anterior interosseous nerve picked up at pronator quadratus
compared to
left side.
We hypothesized neurotopographically this partial median nerve lesion is at supracondylar level, especially posterior portion of the nerve trunk, which contains the bundles to form the anterior interosseous nerve and branches of superficial
flexor
muscle group at elbow level. It will be disculssed along with internal topographic illustrations.
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