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The first aim of this study is to assess the Dural Sac Cross-sectional Area (DSCA) of the lumbar spinal canal in healthy young individuals with the appropriate posture when using MRI. A secondary aim was to determine if obtained DSCA values are correlated with each symptom. The group of 15 healthy individuals (group I) were scanned in the flexed and extended knee posture. The DSCA and Spinal Canal Cross-sectional Area (SCCA) were measured at the center of the pedicle level of each vertebral body. A group of 42 symptomatic patients (group II) were scanned, and the correlation with each symptom was statistically evaluated. In group (I), the mean DSCA was 178 ± 5.1 mm2 in the flexed posture and 158.9 ± 5.6 mm2 in the extended knee posture. At each level, there was a significantly smaller DSCA in the extended posture. In group (II), the mean DSCA was almost two-third of that in group (I). The DSCA at L1/2 and L2/3 showed a mild correlation with the Japanese Orthopedic Association score IV (JOA IV) (urinary disturbance score) (r2 = 0.16 and 0.21). Minimum DSCA was significantly correlated with JOA IC (intermittent claudication) (p = 0.0003, r2 = 0.278). The number of inter vertebral levels with severe and moderate stenosis was assessed and a significant negative correlation was found with JOA IC and IV (p = 0.0046 and 0.0275. r2 = 0.184 and 0.116, respectively). It should be noted that these imaging values should be always considered with matched lumbar symptoms.

Consideration to a New Standard for the Diagnosis of Lumbar Central Canal Stenosis by Quantitative MRI Assessment