An employee was rearranging metal coils using a pendant-controlled overhead crane lift with a double-leg coil lifter. There were stopper boards between each set of coils to prevent unexpected rolling. The employee was removing the stopper boards and stepped between two coils. Once the selected coil was removed, the weight of a coil stacked on top on one side caused the coils to move toward the employee, pinning his lower leg between two coils. The employee sustained a bilateral knee injury: his left knee was fractured and his right knee was strained.