Popular Perth theme park Adventure World says its funnel water slide is safe to use despite a 16-year-old boy suffering a broken leg on the ride.
Heidi Herget said her son Jeremy was in an inflatable raft on the Kraken slide with his 14-year-old brother Toby on November 18 when another raft, carrying four people, slammed into them, causing the brothers to be thrown out.
Ms Herget told 6PR radio no-one at the park had informed her of what had happened and it was instead left to Toby to call her.
Ms Herget said X-rays showed Jeremy had broken his tibia, putting in doubt his promising basketball career.
"He's a state-level basketball player. He was meant to be playing state championships this last weekend," she said.
"He had to sit on the bench - his future is uncertain at this time."
Adventure World chief executive Andrew Sharry said on Tuesday that staff responded quickly by administering first aid within minutes.
He said the ride was immediately closed while staff conducted a full inspection, and it re-opened after getting the all-clear.
Mr Sharry said the park's operations manager met with Ms Herget on the day, and he had also been in contact with her and was personally investigating her concerns.
"The safety of our guests is our number one priority, with all of our rides undergoing stringent daily, weekly, monthly and annual checks," he said.
"We have completed a thorough investigation and concluded that the slide is safe to operate."
Adventure World's insurers have also been notified.
The Kraken is the longest, steepest and tallest funnel slide in the world, dropping 30 metres along the 260 metres of the ride.
