Objective:To determine the cause,prevention and management of failed spinal deformity surgery,and evaluate the indication of spinal revision.Materials and methods:Thirty-one cases of failed spinal deformity surgery were treated surgically.There were 18 males and 13 females with an average age of 14.7 years (ranged from 4 to 35 years) at the present procedures.The average number of previous surgeries for this group of patients was 1.5 times.The duration between the first surgery and revision was 13-114 months,with an average of 47.9 months.There were 16 patients with consistent back pain which became worse after movement,5 patients with implant complication (broken,loosing,exposing),21 patients with failure of instrumentation and deterioration of deformity,5 patients with decreased sensory and motor function.The average preoperative angel of deformity was 75.3 degrees for scoliosis and 76 degrees for kyphosis and the flexibility was 9.8% and 25.2%,respectively.All patients underwent reconstructive surgery with segmental vertebral osteotomy and trans-pedicular fixation and fusion in one or two stages according to the location and degree of the deformity.