Is a Persistent Vacuum Phenomenon a Sign of Pseudarthrosis A
The purpose of this study is to evaluate whether the vacuum phenomenon (VP) resolves after posterolateral lumbar fusion, and whether persistence of VP is indicative of failed fusion. We retrospectively reviewed patients with degenerative lumbar spinal stenosis with instability with a positive VP on preoperative computed tomography (CT) who underwent posterolateral lumbar spinal fusion. Lumbar CT and radiographs were evaluated for the presence of VP and fusion at each level. Thirty-six positive VP levels were identified on the preoperative lumbar CT at the levels in the fusion in 18 patients...

http://www.mdedge.com/amjorthopedics/article/111050/spine/persistent-vacuum-phenomenon-sign-pseudarthrosis-after/page/0/1
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