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Spondylolysis is a condition where there is a break in one or both sides of the ring of a vertebra. In Spondylolisthesis, a break in both sides of the ring allows the body of the vertebra to slip forward. Both can result from repetitive bending backward.
More on Spondylolysis and Spondylolisthesis from the American Academy of Orthopedic Surgeons (AAOS).