Objectives: To determine the incidence of vacuum phenomenon related intra-articular or subfascial gas found on computer-assisted tomography (CT) scans of closed lower extremity fractures.
Design: Retrospective Review.
Setting: Level I Trauma Center.
Patients/participants: A total of 153 patients with closed lower extremity fractures.
Intervention: CT scans of identified individuals were reviewed for the presence or absence of gaseous accumulations.
Main Outcome Measurements: The presence or absence of gas on CT.
Results: Twenty seven (17.6%) of the 153 fractures were found to have intra-articular or subfascial gas on CT despite clear documentation, indicating a closed injury with no significant skin compromise. Of the intra-articular fractures (OTA/AO 33B/C, 41B/C and 43B/C), 20% (23 of 113) were found to have gas on CT. All cases were associated with fracture of the tibia (P = 0.002).
Conclusions: Computed tomography demonstrated the presence of intra-articular or subfascial gas in 17.6% (27/153) of closed lower extremity fractures and in 20% (23/113) of closed intra-articular fractures. The possibility of vacuum phenomenon must be considered when using this imaging modality as the confirmatory test for open intra-articular fracture or traumatic arthrotomy.
Level Of Evidence: Level IV.
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