This is from The Telegraph website:
The 38-year-old was among a group of six adventurers who trekked into the bush to go white water rafting on the West Kiewa River in the state of Victoria.
But as they travelled through an area of fast-flowing water on Sunday, the man's kayak overturned and became stuck under a fallen tree. Since his leg was trapped, his only form of escape was to twist it violently.In the process, he broke it in two places, but was able to wrench himself free.
He was pulled out by friends and spent a painful night in the river gorge with a doctor in the expedition party, while others hiked to find help.