Final answer:
The AP right and left bending lumbar spine projections are useful in assessing structural changes in conditions like scoliosis, lordosis, and kyphosis, and in evaluating post-surgical changes after spinal fusion.
Step-by-step explanation:
The additional projections that may be performed to assess the early structural changes of scoliosis, herniated disks, and motion after a spinal fusion are the AP right and left bending lumbar spine projections. When assessing for scoliosis, an abnormal lateral bending of the vertebral column, bending projections can demonstrate the flexibility or rigidity of the curve, which is important for planning treatment. Scoliosis can also cause twisting of the vertebral column and may create imbalances when a person tries to bend forward, identified by the right and left sides of the back not being level. In the case of lordosis, also known as swayback, which is an excessive anterior curvature of the lumbar spine, and kyphosis, an excessive curvature in the thoracic region, lateral and bending views can help to appreciate the extent of the curvature and any associated deformities.