A disorder of the spine in which the arch of the 5th (or, rarely, the 4th) lumbar vertebra consists of soft fibrous tissue instead of normal bone. As a result, the arch is weak and prone to damage under stress, which may produce spondylolisthesis. Otherwise, spondylolysis is usually symptomless. See cervical spondylosis; cervical osteoarthritis.
Spondylolysis |
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