Abstract
Introduction
Research of degenerative diseases of the spine it is recommended performing radiographs and magnetic resonance imaging (MRI). Physiological curvature of the lumbar spine varies from 35 to 50. Changes sagittal alignment can lead to changes in the lumbar spine kinematics, having influence on the support and load distribution on the spine, causing low back pain.
Methods
100 patients with chronic low back pain (51 men and 49 women), being evaluated degree of lumbar lordosis by three independent examiners by radiography in the standing position and MRI in supine position with flexed lower limbs. Measurement of lumbar lordosis by the Cobb method (L1 to L5 levels) in lumbar radiographs in profile and in the sagittal plane in lumbar MRI.
Results
Average of lumbar curvature on X-rays and the MRI cushion was 42,2° and 31,5°, respectively (p value < 0.001). Average angles of lumbar lordosis by MRI underestimates by 25% compared with lumbar radiographs.
Conclusion
MRI is insufficient for evaluation of lumbar lordosis, it underestimates the true lumbar lordosis. Thus, the lumbar radiological evaluation is essential in assessing the true lumbar lordosis.