In quantitative analysis, the minimal widths of the lateral recess and mid zone area were measured. In MR images the entrance and mid zones of the lateral lumbar nerve root canal were graded as normal, narrowed but not compressed, or compressed. Accordingly, 140 roots in 14 patients (mean age 58, range 48-76 years, male 43%) were evaluated. Of these patients, subjects with distinct only lateral LSS were included. Methodġ02 patients with symptoms of LSS referred for operative treatment were studied in this uncontrolled study. To evaluate the clinical significance of lateral lumbar spinal canal stenosis (LLSCS), found by magnetic resonance imaging (MRI), through correlating the imaging findings with patient symptoms, walking capacity and electromyography (EMG) measurements.
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