Ｘ线平片难以清楚显示腰椎的后部结构，ＣＴ则能清楚地显示之。因而是腰椎放射学研究的重要手段。笔者通过正常腰椎和峡部裂腰椎ＣＴ检查，对关节突关节间隙（ｚｙｇａｐｏｐｈｙｓｅａｌｅｓｊｏｉｎｔｓ；ＺＪ）和峡部裂隙（ｓｐｏｎｄｙｌｏｓｃｈｉｔａｓｉｓ；Ｓ... X-ray film is difficult to clearly show the posterior lumbar structure, CT can clearly show it. So it is an important method of lumbar radiological research. The author through the normal lumbar and isthmic spine lumbar CT examination of the facet joint gap (zy  gapophysealesjoints; ZJ) and the isthmus crack (spondylo  sch asis aasis; S ...