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Samples in periodicals archive:
Spinal fusion is designed to stop the motion at the segment of the spine that is the cause of the patient's pain.
The lumbar spine (low back) has six mobile spinal levels, also known as motion segments, surrounding and in between the five lumbar vertebrae. A spinal level carries the name of the disc at that level, named by the vertebra above and below the disc. For example, the disc space or motion segment between the L4 and L5 vertebrae is known as the L4-5 disc or the L4-5 level.