&gt; anything worse than a sprained ankle<p>There were eleven trampoline deaths in the US between 1990 and 1995.<p><a href="http:&#x2F;&#x2F;www.avon.nhs.uk&#x2F;phnet&#x2F;Avonsafe&#x2F;Trampolines&#x2F;Trampoline%20Injuries.pdf" rel="nofollow">http:&#x2F;&#x2F;www.avon.nhs.uk&#x2F;phnet&#x2F;Avonsafe&#x2F;Trampolines&#x2F;Trampoline...</a><p>There were about 100,000 ER presentations in the US in 2007.  These are all preventable accidents. And these accidents happened after considerable work had gone into making trampolines safer.<p>Safety nets help (many injuries happen when people fall off), but here&#x27;s a passage describing another method of injury:<p>&gt; 3.5 If a trampolinist lands on the mat when out of phase with the other participants, the mat may be rising to meet them and the effect is of meeting a hard surface. All the potential and kinetic energy in the system is transferred to the person, who may be unprepared. Depending on the child’s mass, the energy transfer may be equivalent to falling from 2.2m or 3.4 m equivalent to a fall from a first floor window7. This fact may provide a useful tool to communicate the effect of trampolining to parents and supervisors.<p>None of this means that trampolines should be banned. A manufacturing standard is probably needed for domestic equipment. And people should be encouraged to have adult spotters and safety nets.