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In the treatment of lumbar spinal diseases, the degree of lumbar spinal instability strongly affects the selection of treatment strategy and surgical method. However, a measuring instrument for intraoparative lumbar spinal instability has not been put to practical use yet. Therefore, the present evaluation of lumbar spinal instability depends on surgeon's experience and feeling. From abovementioned point of view, we tried to develop the practical and simple measuring instrument for the objective and quantitative evaluation of intraoperative lumbar spinal instability. This instrument was consisted of Kocher hemostatic forceps with a strain gauge and a push spring, and could evaluate the displacement of spinous process to the cephalocaudal direction when the load was subjected between spinous processes. From the results of preproductoin tests and clinical application, it was considered that the developed instrument was quite useful for the evaluation of lumbar spinal instability.

Development of Simple Measuring Instrument for Intraoperative Lumbar Spinal Instability