The Journal of Bone and Joint Surgery, Vol 70, Issue 9 1341-1347, Copyright © 1988 by Journal of Bone and Joint Surgery, Inc
The prevention of infection in open fractures. An experimental study of the effect of antibiotic therapy
P Worlock, R Slack, L Harvey and R Mawhinney
Medical School, University Hospital, Queen's Medical Centre, Nottingham, United Kingdom.
Using an experimental rabbit model of a contaminated open fracture of the
tibia that was fixed with an intramedullary pin, we assessed the effect of
a single dose of cephradine in preventing post-traumatic osteomyelitis in
which the infecting organism was Staphylococcus aureus. We paid particular
attention to the effect of a delay in giving the antibiotic. The frequency
of osteomyelitis in the animals in a control group (no antibiotic) was 91
per cent. When a single injection of cephradine was given one hour before
inoculation with the bacteria, the rate was 30 per cent, a statistically
significant reduction (p less than 0.01). When cephradine was not
administered until one to four hours after inoculation with the bacteria,
the average rate of osteomyelitis was 51 per cent, a 40 per cent reduction
compared with the rate for the control group. The effect of the antibiotic
therefore persisted even when the initial dose was delayed for four hours
after bacterial inoculation.