Employee started shift on 8/28/21 at 6PM operating a Loader. At 2:30AM (8/29/21), they stopped Loader operation for a break. When they stepped down onto last step, they reported left knee bent backwards causing pain. Medical care diagnoses include: 1) sprain of unspecified site of left knee, 2-3) pain in and effusion unspecified knee, and 4) other bursitis.