Whilst running 9 5/8” casing, a Roustabout on the ground noticed that 3 joints of casing on the pipe rack were misaligned with the catwalk stopper. He called the forklift operator to use the forklift to push the casings back into the correct order using 2 pieces of wood in order to prevent damage to the threads between the casing ends and the forklift. During this, he put his ring finger in between the wood and as the forklift has moved forward his ring finger was crushed resulting in a fracture.