http://www.digitaljournal.com/life/health/trampolines-fun-but-dangerous/article/383080

Why trampolines can be fun but also dangerous

Posted May 6, 2014 by W. Mark Dendy
They may be fun to jump and bounce around on or watch children and grandchildren play on, but a new decade-long study found that trampolines resulted in more than 1 million trips to emergency rooms, costing in excess of $1 billion.
A cast on a broken arm
A cast on a broken arm
Rev Stan (CC BY 2.0)
More than a quarter of the injuries (29 percent) were fractures according to the study published in the Journal of Pediatric Orthopedics.
Indiana University School of Medicine researchers' purpose for the study was to examine and identify patterns of fractures across a large sample population. The research team led by Dr. Randall T. Loder analyzed ER visits in the United States during the years 2002 through 2011.
Children made up the vast majority of injured — more than 90 percent.
The American Academy of Pediatrics in 2012 updated guidelines for use of trampolines in the home concluding that “equipment, safety measures, and supervision within structured training programs are significantly different than those used in the home environment.”