Question: In patients with adolescent idiopathic scoliosis, how do
the results of posterior spinal fusion compare when it is performed with and
without allograft bone?Design: Randomized (allocation not concealed), blinded (surgeons, to
the point in surgery when bone graft was requested), controlled,
noninferiority trial with 2-year follow-up.Setting: A children's hospital in Philadelphia, Pennsylvania.Patients: 91 patients with adolescent idiopathic scoliosis who were
=21 years of age and were scheduled for posterior spinal fusion with a
multisegmented hook-screw and rod system and had a Risser score of =2.
Exclusion criteria included a preoperative curve of >80°. Follow-up was
83% (mean age, 15 y; 83% girls).