title: The etiology of spondylolysis.
mesh_terms: D000368:Aged; D006801:Humans; D007403:Intervertebral Disc / Q000502:physiology; D008159:Lumbar Vertebrae / Q000033:anatomy & histology; D008297:Male; D009132:Muscles / Q000502:physiology; D013168:Spondylolisthesis / Q000209:etiology*; D013169:Spondylolysis / Q000209:etiology*; D013314:Stress, Mechanical