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A retrospective study to frnd out the effect of body mass on surgical treatment in adult idiopathic scoliosis.The results showed that overweight adult idiopathic scoliosis patients had a larger thoracic kyphosis and thoralumbar kyphosis before surgery and a higher degree of postoperative pain.However, BMI did not affect the outcomes of surgical correction for coronal and sagittal scoliotic deformity.Although overweight patients were liable to develop hypertcnsion before operation, the postoperative complication rate was not significantly affected.Introduction: Obesity has reached epidemic proportions globally, and is a major contributor to the global burden of chronic disease and disability.As overweight increases the stress load on the body and accelerates degeneration of the spine with age increasing, it may also influence orthopedic surgery of scoliosis.Also, preoperative comorbidities, which are more common in adults than in adolescents, may increase perioperative complications.To the best of our knowledge,there is no report about effects of BMI on surgical treatment of adult idiopathic scoliosis patients.Methods.Idiopathic scoliosis patients older than 30 years were studied.The patients were divided into overweight group (BMI>=23) and non-overweight group (BMI<23).Preoperative, postoperative first erect and final follow up radiographic measures, perioperative data, Oswestry disability index (ODI) and Visual analogue scale(VAS) were reviewed and compared.Results.71 patients (58 women and 13 men; mean 42.9±12.2 years) with a minimum of 2-year follow-up were included.No significant difference was found in radiographic measures, perioperative data, preoperative comorbidities and postoperative complications except for a larger preoperative thoracic kyphosis (p3=0.000) and thoralumbar kyphosis (p=0.002), and a higher morbidity of hypertension (p=0.004) in the overweight group.Postoperative ODI and VAS improved significantly in both groups as compared with those before operation.Postoperative ODI of the overweight group was significantly higher than that of the non-overweight group (p=0.022).Conclusion.Overweight adult idiopathic scoliosis patients had a larger thoracic kyphosis and thoralumbar kyphosis before surgery and a higher degree of postoperative pain.However, BMI did not affect the outcomes of surgical correction for coronal and sagittal scoliotic deformity.Although overweight patients were liable to develop hypertension before operation, the postoperative complication rate was not significantly affected.Significance.The effect of body mass on surgical treatment in adult idiopathic scoliosis was showed.BMI did not affect the outcomes of surgical correction for coronal and sagittal scoliotic deformity.