In a statement released today, the American Academy of Pediatrics takes a strong stand on the question of whether trampolines are safe. The professional organization for pediatricians now "strongly discourage[s]" home use of trampolines, noting that they are in the same "attractive nuisance" category as swimming pools, but without all the commonly accepted safety precautions. The AAP also notes that increased use of safety equipment, such as net enclosures and padding, has not led to a corresponding decrease in injuries.
Of course, many families have trampolines because they're fun, and they encourage physical activity. The AAP does have suggested safety guidelines for those homes that already have trampolines, or for families that visit indoor trampoline parks. Or stick with one of these outdoor activities. Nothing is risk-free (I once slashed the back of my ankle open while walking my bike!), but you can enjoy family fun without the dangers trampolines pose.