Lawnmower Injuries Remain Source of Serious Injury and High Costs

October 1, 2018

Lawnmower injuries persists at a rate of close to 6,400 a year, most of them requiring surgery and hospitalization, and costing an average of $37,000 per patient.

In what Johns Hopkins Medicine researchers call an unusually comprehensive analysis of nationwide data, they tracked eight years of data between 2006 and 2013. Their findings were reported in the September issue of Public Health Reports.

Overall the new analysis showed that the most frequent injuries were to men (43,567 of 51,151, or 85.2 percent). Children up to age 4 were six times more likely to have a foot/toe or lower extremity injury and 1.7 times more likely to have an amputation than those age 15 and above.

Conversely, older teens and adults age 15 and above were 8.3 times more likely to have an injury to the hand or upper extremity. This, the researchers said, suggests that young children are more likely to get injured by running into the yard while a family member operates the lawnmower, or by getting their foot trapped in the machine while sitting in the operating member’s lap. The research also suggests the majority of teens and adults sustain injuries from sticking their hands into the mower to clear debris.

The data did not reveal the type of mower that caused an individual injury; what mower designs were most likely associated with injuries; or whether those injured were to bystanders or the people mowing.

Previous studies have generally collected data only on certain types of injuries associated with consumer products without addressing issues of cost or national scope, said Dr. Deborah Schwengel, assistant professor of anesthesiology and critical care medicine at the Johns Hopkins University School of Medicine and the study’s senior author.

Schwengel and her team drew on information gathered for the U.S. Nationwide Emergency Department Sample (NEDS), the largest emergency department database in the country.

The researchers identified 14,878 lawnmower injuries during the eight-year period, which, when adapted to reflect national emergency room visit data, represented an estimated 51,151 injuries, and about 6,394 cases per year on average.

Most of the injuries were lacerations (23,907 of 51,151, or 46.7 percent), fractures (11,433 or 22.4 percent) and amputations (11,013 or 21.5 percent). The most common injury locations were wrist or hand (33,477, or 65.4 percent) and foot or toe (10,122 or 19.8 percent).

Of the 51,151 cases, 43,567 (85.2 percent) were in men; 19,162 (37.5 percent) in the South; 33,886 (66.3 percent) occurred on a weekday; and 36,686 (81.7 percent), occurred between April and September.

The treatment costs for emergency room charges averaged $2,482 per patient, and average inpatient charges totaled $36,987 per patient.

“Understanding what types of injuries occur in certain groups should help engineers design safer lawnmowers, and policymakers create more appropriate prevention policies,” Schwengel said. An example of a better lawnmower design that could prevent injury, the researchers said, would be one that automatically stops when human flesh is detected near blades.

Other authors on this paper were Daniel G. Hottinger, Isam Nasr, Joseph K. Canner and Rahul Koka of Johns Hopkins and Deepa Kattail of McMaster Children’s Hospital.

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