An employee was clearing a jam in front of the wood sorter gate before the chipper in-feed conveyor. The jammed wood had pushed the sorter gate up to nearly the full-open position. The employee attached a chain-fall to one of the jammed logs. As the log was raised, the rest of the jam was relieved and fell on the conveyor below. The sorter gate then closed on the employee's right leg crushing it between the gate, a piece of wood and the surrounding frame. The employee's lower right leg was fractured.