Vrms/T Quantititation in Patients with Lumbar Spinal Stenosis

Abstract

Thirty consecutive patients with clinical and radiographic findings consistent with lumbosacral root injury were evaluated. Electrodiagnostic examinations included determination of root mean square (Vrms)/turns (T) values. Vrms/T values >1 are consistent with chronic neurogenic injury and have been correlated with increase in fiber density. Radiographic studies were independently classified as having severe (group I; n= 8), mild (group II; n=11), or no lumbar spinal stenosis (group III; n=11). Abnormal Vrms/T values were present in all 8 patients in group I in comparison to 0/11 in group II and 2/11 in group III (p