The authors report a case of foot trauma produced by a piece of the la
wn mower blade, which was fired projectile-wise from the machine while
it was in operation. At hit the calcaneous and remained trapped in th
e bone. The wound healed after removal of the foreign body, wound debr
idement and systemic and local antibiotic prophylaxis. In the professi
onal literature available, no report has been found on a missile injur
y produced by a piece of rotating lawn mower knife.