الفهرس 
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Abstract
Lumbar radiculopathy resulting in back and leg pain is a common clinical problem ( Ellenberg et aI., 1993). Diagnostic sts for the causes of low back pain and radiculopathy span a ide range of technologies. These include, the clinical imaging tests, electrophysiologic tests, laboratory ests, diagnostic injections and other techniques. Various diagnostic tests may examine different aspects of a single underlying disorders. For example, straight leg raising evaluates nerve root irritation, MRI evaluates the extent of anatomic disruption, and electrodiagnosis evaluates electrical performance of nerves and muscles. No diagnostic test is perfect, each has false positive and negative results ( Deyo et aI., 1994). Several neurophysiological investigations are used in the diagnosis of lumbosacral radiculopathy namely Fwaves, H reflex, electromyography of segmentally innervated muscles, SEPs, percutaneous and direct needle stimulation. Recently the magnetic stimulation technique has also been found useful in the diagnosis of lumbosacral root lesions ( Banerjee, et aI., 1993). Magnetic resonance imaging has largely replaced CT as the primary diagnostic itnaging modality in the evaluation of suspected radiculopathy, while NEE remains the mainstay of electrodiagnostic evaluation (Nardin et aI., 1999). There is still controversy regarding the significance of F wave, H reflex, and SEPs, whereas NeSs are usually normal in radiculopathy.