title: Increase in complex spinal fusions for older patients.  Six-year study shows a 15-fold increase in certain lumbar surgery procedures.  Why?
mesh_terms: D000368:Aged; D006801:Humans; D008159:Lumbar Vertebrae / Q000601:surgery*; D013123:Spinal Fusion / Q000009:adverse effects / Q000706:statistics & numerical data*; D014481:United States