Use of allograft bone for posterior spinal fusion in idiopathic scoliosis

Eighty-seven adolescents with idiopathic scoliosis (77 female and 10 male p atients) who underwent posterior spinal fusion with instrumentation using o nly allograft bone for graft material were evaluated retrospectively. The a verage age at surgery was 14 years 3 months. Each patient had a minimum 2-y ear followup, with an average of 3 years 5 months followup, The average pre operative curve was 59 degrees thoracic (range, 31 degrees-90 degrees) and 52 degrees lumbar (range, 21 degrees-65 degrees). At followup, the thoracic curve measured an average of 35 degrees and the lumbar curve measured an a verage of 34 degrees. The average loss of correction from the immediate pos toperative period until last followup was 6.5 degrees or 11% in the thoraci c curve and 10 degrees or 19% in the lumbar curve. There were seven reopera tions; one of these reoperations involved repair of a pseudarthrosis, There was one clinical infection. The typical patient had a 2-ounce allograft at an average cost of $800, The patients' average loss of correction, complic ation rate, and reoperation rate compare favorably with results reported in other series using autograft bone. The authors of this study showed the ab ility of allograft bone to produce reliable results with a satisfactory out come. The potential advantages of using allograft must be weighed against t he potential disadvantages before recommending its routine use.