In 1984 Cotrel and Dubousset had designed a new method of instrumentation aimed at obtaining a surgical fixation of the scoliotic curve. This instrumentation system provided better rigid fixation and allowed correction of rotation. Furthermore, it provided wide application for other spinal disorders. Since 1986, we applied this system to lumbar disorder accompanied with instability, Charcot spine and lumbar caries. In 7 cases, it was used for internal fixation after posterior decompression. In a case of lumbar caries, this instrumentation was used for internal fixation after anterior procedure. This method gave best results for rigid fixation and spinal alignment in all cases. No failure of instrument was observed at postoperative course. We recommend this method as instrumentation of the lumbar disorder accompanied with instability.
