An employee was disconnecting a bolt from an I-bolt attached to the top frame rail of the side wall of a trailer. The bolt goes through the threaded portion of the I-bolt to hold it in place, and a crane hook goes through the I-bolt. The crane hook was still attached to the I-bolt. As the employee was removing the tension bolt, the crane trolley was moved, and the employee's finger was pinched/amputated between the bolt head and the trailer frame rail.