Fig. 2
From: Reliability of preoperative MRI findings in patients with lumbar spinal stenosis
Frequency distribution of the categorical parameters: a foraminal stenosis according to Lee et al. b central canal morphology according to Schizas et al. c facet joint osteoarthritis according to Weishaupt et al. d redundancy of the cauda equina and e intraspinal synovial cysts. The values for a, b and c are dichotomised. Category 0 indicates absent or mild pathology and category 1 indicates moderate or severe pathology