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Objective: To explore the relationship between radiological parameters (maximal lumbar lordosis - maximal thoracic kyphosis, maxLL - maxTK; sacral slope/pelvic tilt, SS/PT; and SS-PT et al.) and the diagnosis of degenerative disc disease (DDD) in compensatory sagittal balanced patients. Summary of background data: Sagittal balance involved inner relationships among a combination of several pelvic and spinal parameters. We hypothesized that several complex parameters might distinguish sagittal balanced patients with DDD from the healthy population.