Background The dogma that traumatic wounds should not be sutured after 6 h is based on an animal experiment by P L Friedrich in 1898. There is no adequately powered prospective study on this cut-off of 6 h to confirm or disprove the dogma. The aim of this study was to provide evidence against the dogma that wounds should be sutured within 6 h after trauma. Method 425 patients were included in a prospective cohort study. Patients' wounds were closed, independent of time after trauma. All patients were seen after 7–10 days for removal of stitches and wound control on infection. Results Of the 425 patients, 17 were lost to follow-up. Of the remaining 408 patients, 45 had wounds older than 6 h after trauma. At follow-up 372 patients (91%) had no infection and 36 patients had redness of the suture sites or worse. 11 patients (2.7%) had general redness or pus. Of those with a wound older than 6 h, three of 45 (6.7%) wounds were infected, versus 30 of 363 (9.1%) in wounds younger than 6 h (p=0.59). Conclusion In everyday practice wounds are sutured regardless of elapsed time. Here an attempt was made to present the evidence for this daily routine, contrary to Friedrich's Dogma.