Lawn mower injuries are a potentially devastating, yet preventable cause of morbidity and mortality in the pediatric population. The sequelae to these injuries can become even worse if the initial presentation goes unsuspected by medical staff, leading to a delay in treatment. The authors report the case of a lawn mower-related penetrating missile injury, where the extent of injury was not appreciated by the patient until signs and symptoms of a soft-tissue infection developed, prompting the patient to seek medical attention the next day.Keywords Pediatric lawn mower injury Á Projectile Á Infection Á Retained foreign body
Case reportA 13-year-old male was seen in the emergency department because of pain and redness of the skin overlying his sternum. One day before, he had been mowing the lawn when he felt a sudden and sharp pain in his chest. He was aware of the incident and thought he had been stung by a bee or a wasp. However, the next morning his mother noticed a large red area in the center of his chest. His medical history was otherwise unremarkable.On physical examination, a punctate entry wound was visible overlying the mid-sternum with surrounding erythema. The wound was tender to palpation, but otherwise there was no purulence, fluctuance, discharge, or crepitus noted. The remainder of the examination was normal. Roentgenography demonstrated a foreign body embedded in the subcutaneous tissue and the sternum (Fig. 1).The patient was taken to the operating room for removal of the foreign body. A metal pin, 5 cm in length and 3 mm in diameter, was found embedded in the sternum. Surrounding the pin, there was purulent fluid and gas within the soft-tissue. A sample of the fluid was obtained for gram stain and cultures. The entry tract was debrided and the wound was irrigated and packed with half-inch packing tape (Fig. 2).Postoperative wound care consisted of dressing changes and whirlpool therapy along with intravenous antibiotics. Operative cultures demonstrated Enterobacter and Clostridium species susceptible to trimethoprim/sulfamethoxazole. After the placement of a peripherally inserted central catheter (PICC line), he was discharged home on postoperative day 5 and instructed to continue with a week of intravenous trimethoprim/sulfamethoxazole followed by a second week of the oral form per recommendations made by the infectious disease consultants. Follow-up examination on postoperative day 17 revealed the wound to be healing well and without any signs of infection. The PICC line was subsequently removed.
DiscussionLawn mower injuries in children occur frequently, are preventable, and have the potential for devastating sequelae. There are approximately 77,800 lawn mower injuries treated in the USA every year, with 9,400 involving children [1]. About one-fourth of these injuries are to children younger than 5 years [2]. A majority of the injuries caused