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The Vacuum Phenomenon

A CT Sign of Nonunited Fracture

Bernard Stallenberg1, Afarine Madani1, Franz Burny2 and Pierre Alain Gevenois1

1 Department of Radiology, Hôpital Erasme, Université Libre de Bruxelles, Route de Lennik 808, 1070 Brussels, Belgium.
2 Department of Orthopedic Surgery, Hôpital Erasme, Université Libre de Bruxelles, 1070 Brussels, Belgium.



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  		Fig. 1A. —18-year-old man with fracture of left humeral diaphysis. Axial CT image photographed with window at 2004 H and level at 379 H shows two gas bubbles (arrows) between bone fragments.

 


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  		Fig. 1B. —18-year-old man with fracture of left humeral diaphysis. Density profile for A shows gaseous nature of bubbles (respectively white and black curved arrows).

 


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  		Fig. 2A. —52-year-old man with fracture of left tibial diaphysis. Straight arrows = gas bubbles. Axial CT image photographed with window at 2050 H and level at 400 H shows linear gas collection (arrow) between bone fragments.

 


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  		Fig. 2B. —52-year-old man with fracture of left tibial diaphysis. Straight arrows = gas bubbles. Multiplanar reconstruction of A generated sequential coronal image photographed with window at 2050 H and level at 400 H shows linear gas collection (arrows) within fragments.

 

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