50-year-old Mark Fowell from Poole was attempting to load out a portable building onto the back of his lorry. However, he was not set up close enough to it and instead of the load coming cleanly off the ground, it was dragged towards the vehicle.
At the same time, 54-year-old Adrian Hoyland, also from Poole, had crawled under the cabin to recover materials. He suffered a fractured pelvis and fractured ribcage, and was unable to work for three months.
The incident took place on a site in Blandford Road, Hamworthy on 9th May 2011.
An investigation by the Health & Safety Executive (HSE) established that Mark Fowell had failed to put a lift plan or any other planning measures in place.
Bournemouth magistrates fined Mark Fowell, of Hythe Road, Oakdale, Poole, £4,000 and ordered him to pay £6,000 in costs after pleading guilty to breaching Regulation 8(1) of the Lifting Operations and Lifting Equipment Regulations 1998.
Speaking after the hearing, HSE inspector Martin Lee said: "This incident was completely avoidable and was a direct result of a lack of any planning for a simple lifting operation. Mr Hoyland suffered significant injuries and the situation would have been far worse had it not been witnessed and the alarm immediately raised.
"All lifting operations, no matter how simple or routine, have the potential to cause serious harm and it is vital that they are always properly planned by suitably competent people. Clear lines of communication are needed to ensure that everyone in the area knows what is to happen and what is expected of them."