目的：提出腰椎小关节真空现象在CT诊断意义中的一种新观点。
Objective: A new viewpoint about the CT diagnostic significance of vacuum phenomenon within the lumbar intervertebral joint was proposed.
尽管病因尚不明，一些作者认为它是椎间盘内空气的扩展（真空现象）。
Although not completely understood, some authors believe it is an extension from the intradiscal air (vacuum phenomenon) .
材料与方法：分析9例腰椎小关节真空现象的CT片及腰椎侧位片的表现。
Materials and Methods: the CT features with vacuum phenomena within the lumbar intervertebral joint of 9 cases were analyzed and compared with lateral views of the lumbar spine.
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