Researchers in the Netherlands studied 2,471 patients who developed venous thrombosis between 1999 and 2004.
Patients were questioned about any injuries, surgical procedures, plaster casts or immobilisations they had within a year of developing clots.
They were then compared with 3,534 controls who did not have DVT. A total of 289 patients (11.7%) had a minor injury in the three months prior to developing venous thrombosis, while 154 controls (4.4%) had a minor injury before completing the questionnaire.
Authors said: ‘Minor injuries that do not require surgery, a plaster cast or extended bed rest were associated with a three-fold greater relative risk of venous thrombosis.
‘The association was strongest for injuries that occurred in the month before the venous thrombosis, suggesting a transient effect.’
Archives of Internal Medicine (2008) 168: 21-26