We performed a study to evaluate the complication ratio associated with spinal instrumentation surgery for non-deformity or non-tumor patients. One transient cervical myelopathy, one infecion with MRSA and one pedicle fracture were observed. Six cases (8%) had instrument problems, 3 wire breakages and 3 dislodgements of the screw or the rod. It is considered that the most important factor for avoiding complications when performing instrumentation surgery is to select a familiar method. Furthermore, as there was no direct injury to large vessels or nerves by the screw, pedicular screwing was considered to be a safe method.
