It happened on the B3081 near Verwood - he had to be cut free by firefighters.
Fresh Appeal Over Serious Sex Assault
Detectives in Bournemouth are still trying to track down a man who carried out a serious sex attack on another man.
It happened between 10pm and 11pm on Thursday 4th October 2012, in the area of Boscombe Gardens.
The victim, a 21-year-old man from Bournemouth, was not injured.
A police cordon was put in place and an examination carried out by specialist crime scene investigators.
Detective Inspector Becky Riggs, of Bournemouth and Poole CID, said:
“This was a sustained attack that lasted approximately 30 minutes.
“It is likely that there were members of the public in the vicinity at the time that might have seen something suspicious.
“I am very keen to encourage members of the local community, in particular, anyone that was in the gardens around this time, to do the right thing and come forward.
"I stress that all calls to Dorset Police are treated with the strictest confidence.”
The offender is described as a white man, aged between 30 and 50, of slim muscular build, clean shaven with a deep voice. He was wearing a dark coloured hoody, which was possibly Adidas, and dark coloured tracksuit bottoms.
Witnesses and anyone with information should call Dorset Police in confidence on 101.
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