It happened on the B3081 near Verwood - he had to be cut free by firefighters.
Motorbike Stolen After Crash
Police in Christchurch are appealing for witnesses and anyone with information to come forward following the theft of a motorbike which occurred on the Avon Causeway.
The theft happened sometime between 1pm on Friday 12 October 2012 and 11am on Sunday 14 October 2012.
The motorbike, a two-year-old black Shineray 125cc, was stolen from a lay-by on the Avon Causeway. The bike had been left in the lay-by after the owner had been involved in a single vehicle road traffic collision on Friday morning.
Police Constable Mat Silvey, of Christchurch police, said:
"It is very distressing for the victim to be firstly involved in a collision and then to have his bike stolen.
"The lay-by is on a very busy road and I am hopeful that someone witnessed the motorbike being recovered. It is possible that the offenders used another vehicle to help them steal the bike.
"I am keen to speak to anyone who may have witnessed this incident, and anyone who may have information about the offenders or any vehicle that may have been used."
The victim, a 20-year-old man from Christchurch, was not injured in the collision.
PC Mat Silvey continued:
"Anyone with information is urged to contact Dorset police on the non-emergency number 101."
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 14:212. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone tariffs may apply.
Violent crime was up 37% in the last year. Police say it's mainly due to a change in how offences are recorded.
Anne-Marie Ellement took her own life after claiming she'd been raped by two colleagues.
48 Zany Zebras sculptures were sold off to raise money for Marwell Zoo.
Recently Played Tracks
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
What's happening on the roads where you are?
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Find out more about some of the companies advertising on Heart.
Get some great ideas on how to advertise your business on radio, online and on mobile.