The injured employee was assisting with backfilling an excavation. The employee was kneeling on the pipe with both knees and was holding a piece of plywood while their right hand sat on the second pipe next to the hole. While the excavator was backfilling the trench he was shaking the bucket to allow the dirt to come out. A piece of concrete fell out of the bucket and struck the back of the employee's right hand, causing a displaced fracture to the metacarpal bone of the index finger, a fracture to the metacarpal bone of the middle finger, and a laceration.