Final answer:
The greater trochanters are required in a scoliosis series to help maintain the alignment and positioning of the spine. They serve as attachment sites for muscles that stabilize and support the spine, aiding in proper alignment in individuals with scoliosis.
Step-by-step explanation:
The greater trochanters are required in a scoliosis series because they play a role in the positioning and alignment of the spine. In scoliosis, there is an abnormal lateral curvature of the vertebral column. Compensatory curves may also develop in other areas of the vertebral column to help maintain the head positioned over the feet. The greater trochanters, which are bony projections located on the upper thigh bone (femur), serve as attachment sites for multiple muscles that act across the hip joint. These muscles contribute to the stabilization and support of the spine, helping to maintain proper alignment in individuals with scoliosis.