16/08/2016 9:42 AM AEST | Updated 16/08/2016 9:48 AM AEST

Kids' Trampoline Park Parties Lead To Emergency Room Tears

It's all good fun 'til someone breaks a leg.

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Tranpoline parks are becoming more popular in Australia.

Indoor trampoline parks are opening at a rate of three per month in Australia but nearby emergency departments are noticing an increase in trampoline-related trauma like breaks and sprains.

A study of Sydney Children's Hospital trampoline-related injuries found 40 children were treated in six months, leading researchers to describe parks as an "emerging public health concern" in journal Injury Prevention.

Of those injured, most were aged 10 but one was just one year old. More than half had sprains and bruises while a third had fractured bones and 12 percent required surgery.

The study also warned of children of different sizes jumping at once to create a "super bounce".

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Most trampoline parks allow kids of different ages to bounce together.

"These occurred when the smaller of the two (or more) users fell as a result of the increased energy transferred from the larger bouncer, resulting in a mistimed landing or being projected to an unexpected height or distance," the study said.

The study estimated 20 new trampoline centres opened in the last three years across the nation.

The study's chosen hospital is less than 6km from trampoline park Sky Zone Alexandria and a spokesperson said the park was a member of independent body the Australian Trampoline Parks Australia which released a statement.

We believe that the positives of youth recreational sports far outweigh the negatives.Australian Trampoline Parks Association

"Such studies provide a deeper understanding of safety issues and provide data on our sport allowing us to better educate parents, jumpers and parks so all can fully enjoy indoor trampoline park facilities," the statement said.

"We believe that the positives of youth recreational sports far outweigh the negatives and we are actively engaged in programs aimed at promoting the safety and well-being of jumpers who visit our member parks."

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