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Radiculopathies and Plexopathies 

Radiculopathies and Plexopathies
Radiculopathies and Plexopathies

Jun Kimura

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date: 24 October 2021

This chapter reviews clinical and electrophysiologic features of cervical and lumbosacral radiculopathies and brachial and lumbosacral plexopathies. Proximal lesions at the level of the root or plexus affect either the motor or sensory fibers or both. The features of motor involvement include weakness, muscleatrophy,hyporeflexia, fatigue, cramps, and fasciculations. Sensory abnormalities, which usually accompany motor deficits, sometimes dominate the picture.Electrophysiologic studies help delineate the distribution of the affected muscles to localize the lesion and elucidate its extent and chronicity. Nerve conduction studies may reveal a reduction in amplitude of muscle or sensory response in appropriate distribution, elucidating the site of involvement. Needle examination initially reveals poor recruitment of motor units. Subsequent appearance of fibrillation potentials and positive sharp waves in 2–3 weeks suggests axonal degeneration.

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