Fig. 1.

Radiologic parameters of whole spine sagittal MRI. From the whole spine sagittal MRI, we selected the largest spinal canal image at the lumbar spine (A). The anteroposterior diameter of the spinal canal at the mid-portion of the vertebral body (white line) and mid-vertebra body height (white arrow) at L4 and L5 was measured (B). From the whole spine sagittal MRI, we selected the largest spinal canal image at the thoracic spine (C). The anteroposterior diameter of the spinal canal at the mid-portion of the vertebral body (white line) and mid-vertebra body height (white arrow) at T5 and T6 was measured (D).