Background:Lumber Spinal Stenosis can give rise to several clinical syndromes depending upon the severity of compression resulting from spinal stenosis. LSS diagnosis is made through a complete assessment that combines history, physical examination, neurophysiology and imaging. EMG and NCS play important role in the evaluation of LSR. Present study was planned to see the extent of functional loss (EPE) by conduction studies associated with the structural abnormality (MRI) of lumber spinal stenosis.