An employee had just completed grinding on a 1,300-pound rotor using a pneumatic grinder. They were attempting to manually push the rotor on a cart out of the workstation when the retractable air hose created an obstruction under the wheel of the cart. The employee went to push the cart over the obstruction when the cart and rotor became unstable, tipping over and striking the employee on the left foot. They sustained multiple foot fractures that required hospitalization and surgery.