EMPLOYEE STATED THAT HE WAS COMING DOWN THE STEPS AT THE PARTS TRAILER. THE BOOT ON HIS RIGHT FOOT GOT CAUGHT ON THE SECOND STEP, CAUSING HIM TO FALL FORWARD TOWARD THE GROUND. HE LANDED ON HI S LEFT FOOT CAUSING IT TO CREEL UNDER RESULTING IN FRACTURE ABOVE THE ANKLE ON HIS LEFT FOOT. REPORTABLE BUT NO LOST TIME INCURRED.