Inflatable bounce houses and moonwalks are springboards for childhood fun, but they're also the source of an alarming number of children's injuries, a new report warns.

On average, 31 children a day are transported to U.S. emergency departments for treatment of bounce-house injuries, including fractured bones and muscle damage, the study found.

"If this was an infectious disease, we'd call it an epidemic and it would be on the front pages all over the country," said study co-author Dr. Gary A. Smith, director of the Center for Injury Research and Policy at Nationwide Children's Hospital in Columbus, Ohio.

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