A Forklift was being used to move drill collars and realign them all with the pin/box in same direction. When the forklift was moving in reverse to re-position the collars back on the wooden planks, the drill collars slowly rolled forward on the forks. The injured person put his right foot on the front drill collar to stop them rolling forward and falling off the forks. As he gave a signal for the forklift driver to tilt the forks back (Fig.1), his foot slid off the collar. The collar then fell from the forks and fell on his right leg (Fig.2) causing a fracture. The injured person will be off work for 3 to 6 months.