Low BMI (< 10th percentile) increases complications and readmissions after posterior spinal fusion in adolescent idiopathic scoliosis.

There is a higher occurrence of complications in UW AIS patients undergoing PSF. Low BMI is an independent predictor of ≥ 15% blood loss, pneumonia, and readmissions. Like their overweight counterparts, underweight AIS patients have an increased postoperative risk for negative complications.