腰部脊柱管狭窄症に対するきょく突起正中縦割進入法を用いた腰椎椎弓形成術の治療経験

Abstract

Recently we performed lumbar laminoplasty by the midline spinous splitting approach as an operation method for lumbar spinal canal stenosis in order to preserve posterior support tissue, especially the paravertebral muscle and facet. We investigated and compared lumbar laminoplasty by the midline spinous splitting approach and conventional operation method concerning operation time and blood loss.Between October 2002 and July 2004, 21 patients underwent the conventional operation, and the number of decompression lamina was 56 levels, where 16 were male and 5 were female (mean 2.7 levels per patient). After July 2004, 13 patients underwent lumbar laminoplasty by the midline spinous splitting approach, and the number of decompression lamina was 30 levels, where 9 were male and 4 were female (mean 2.3 levels per patient). The operation time of the conventional operation method for one level was 58.3 minutes on average, and blood loss was 89.8g. That of lumbar laminoplasty by the midline spinous splitting approach for one level was 52.4 minutes on average, and blood loss was 58.3g.