This article describes the diagnostic value of different neurophysiological
techniques (sensory and motor neurography, F-wave studies, H-reflex, senso
ry and magnetic evoked potentials, and EMG) which are used to study patient
s with radiculopathies due to nerve root compression and inflammatory proce
sses. The importance of sensory nerve conduction studies for differentiatin
g between radiculopathies and plexopathies is highlighted, Although imaging
techniques have improved and show structural lesions, electromyography inc
luding paravertebral recordings are essential in the study of patients with
compressive radiculopathies because only this technique offers the possibi
lity to show functional impairment.