The researchers, from Monash University, Flinders University and UTS, said that despite improved product standards, including safety enclosure netting, the expected drop in injuries hadn't eventuated.
Falls caused the most accidents, with 81 per cent resulting in a fracture, usually to arms.
Non-fall injuries, mainly colliding with another user or over-exertion, was also dominated by fractures, but mainly to legs.
Netted enclosures may have led parents to wrongly believe children were only injured when they fell from the frame, the researchers said.
In response to the increase, a revised Australian mandatory standard is due to be introduced in two stages.
"It is thus important that the product mandating be coupled or linked to other injury prevention strategies such as public awareness and education," the researchers said.
"In addition, the buy-back and destruction of old and dangerous products would accelerate the reduction in injuries."
- AAP