Multiple Jumpers
There should never be more than one individual jumping on a trampoline at a time. As one person bounces, according to Dr. M. Douglas Baker of Yale-New Haven Children's Hospital, other individuals become "projectiles that can easily be catapulted off the trampoline." Also, simultaneous jumping may result in serious head and body collisions.
Hard Landings
Many trampoline injuries happen when an individual falls off the trampoline and onto a hard surface. This may be the hard dirt of a family's backyard, the rocky cement around a poorly placed trampoline or a random sharp, rough or pointy object in the trampoline's vicinity. Even when falling onto a cushioned trampoline mat, according to one Alaskan study, 40 percent of the children in the study were still injured from falling off a trampoline.
Choking
A child may carelessly jump onto a trampoline while chewing a piece of gum or other food item. Just as a person should never run or laugh while eating, jumping with food in the mouth can be a sure cause of choking. Take care to ensure that children never start jumping with food in their mouths or hands.
Unstable Trampoline
Trampolines are often placed on a grassy patch in a family's backyard. The unevenness of the rugged lawn may cause a trampoline to wobble when jumped on, and, if jumped on in the wrong spot, to flip over, injuring the jumper as well as any close-by onlookers.