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Abstract
Lumbosacral spinal stenosis was defined as a condition involving any narrowing of the lumbar spinal canal, nerve root canals or tunnels of intervertebral formaina (Arnoldi et al, 1976). Lumbosacral spinal stenosis (LSSS) is a prevalent and disabling condition in the aging population that often results in substantial physical burden for individuals with the disorder. LSS was noted as the most common diagnosis associated with spinal surgery in patients over 65 years of age (Ciol et al in 1996). The relationship between theradiologic measurements and either the clinical syndrome or surgical success are not straightforward (Boden et al,
1990 & Herron and Manglesdrof, 1991). Without an anatomic gold standard, diagnosis of the clinical syndrome of canal stenosis continues to rely on clinical judgment more than any one diagnostic test (Plastaras, 2003). Electrodiagnostic testing (EDX) is thought to be useful in diagnosing the clinical syndrome of spinal stenosis because it tests physiologic consequences of the stenosis and can also detect numerous other disorders in the differential diagnosis, which do not have gross anatomic findings as polyneuropathy or compressive focal neuropathy (Andrew et al, 2005). Lumbar spinal canal stenosis represents a special case of lumbar and sacral nerve root disease. It actually affects the rootlets, proximal to their
coalescence into roots (Storm and Kraft, 2004). The SEP is believed to be of particular use in assessing radicular insults producing primarily sensory symptoms (Dumitru and Dreyfuss, 1996). Few studies evaluated the use of SEPs and DSEPs in cases of LSSS.
The aim of this work was to evaluate Dermatomal Somatosensory evoked potentials (DSEPs) as an objective test for detection of sensory compromise and segmental affection of sensory roots in lumbar spinal canal stenosis.