Experts want a new safety standard brought in to control trampolines, which are associated with more than 1000 injuries a month, according to ACC data.
Seventy-eight per cent of the trampoline injury claims made to the Accident Compensation Corporation involve children aged 14 or younger.
The number of head injuries associated with trampolines increased by 289 per cent from 2013/14 to 2017/18.
In the same period, neck injuries rose by 33 per cent and lumbar and thoracic spinal injuries rose by 29 per cent.
ACC's annual cost of treatment for trampoline injuries rose from $4.2 million, to $8.9 million; the average cost per patient rose from $443, to $683.