Fig. 1From: The paradoxical relationship between ligamentum flavum hypertrophy and developmental lumbar spinal stenosisMeasurement of midline anteroposterior (AP) spinal canal diameter at L1 to S1 using T1-weighted axial MRI scan (marked in red line) - at the cut where the entire bony canal ring could be seen and with the thickest pedicle widthBack to article page