Objective. To introduce a new internal fixation system of spine and its characteristics. Methods. To review 16 patients with lumbosacral instability who were treated by this new technique

including their clinical outcomes and radiographic evaluation. Results. Fifteen patients gained complete recovery from their preoperative symptoms. One patient who had experienced two operations before and with problems of urinary and fecal incontinence and walking difficulty still had lower limb pain

muscle weakness and urinary incontinence after operation.There is no evidence of spine glide on X-ray

implant failure

neural complication or infection during follow up. Conclusion. Diapason system can achieve good early postoperative results with few complications and ease to use for lumbosacral instability.