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Vacuum phenomenon in a dislocated joint
  1. R Ahmad1,
  2. S Annamalai1,
  3. M Radford1,
  4. C Cook2
  1. 1
    Department of Orthopaedics, Weston General Hospital, Weston-Super-Mare, UK
  2. 2
    Department of Radiology, Weston General Hospital, Weston-Super-Mare, UK
  1. Mr R Ahmad, 18 Oakwood, Coxhoe, Durham, DH6 4SQ, UK; riazhzi{at}

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A vacuum phenomenon is a radiolucent collection of gas that is present at the sites of negative pressure. When traction is applied to a joint or when a joint dislocates, blood gases composed …

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  • Competing interests: none declared.