Which structures primarily maintain the lumbar lordosis?

Which structures primarily maintain the lumbar lordosis?

• A. Anterior height of the vertebral bodies and intervertebral discs
• B. Posterior height of the vertebral bodies
• C. Uniform vertebral body height
• D. Increased thoracic kyphosis

Answer: (A)

Lumbar lordosis is produced by a taller anterior column in the lower spine, so the front parts of the vertebral bodies together with the intervertebral discs create a forward wedge that curves the lumbar region inward. This anterior height pushes the vertebrae forward relative to the back, sustaining the lordotic curve. If the posterior heights were greater, the curvature would lessen or reverse; if all vertebral and disc heights were uniform, the spine would be flatter with less or no lordosis. Thoracic kyphosis can influence overall posture and necessitate compensatory changes in the lumbar area, but it does not establish the lumbar curve itself.

Lumbar lordosis is produced by a taller anterior column in the lower spine, so the front parts of the vertebral bodies together with the intervertebral discs create a forward wedge that curves the lumbar region inward. This anterior height pushes the vertebrae forward relative to the back, sustaining the lordotic curve. If the posterior heights were greater, the curvature would lessen or reverse; if all vertebral and disc heights were uniform, the spine would be flatter with less or no lordosis. Thoracic kyphosis can influence overall posture and necessitate compensatory changes in the lumbar area, but it does not establish the lumbar curve itself.