EE WAS SLIDING A ROCK BREAKER PART ON A PALLET FROM THE BACKHOE BUCKET INTO THE BED OF A PICKUP TRUCK. THE BOARD ON THE PALLET CAME OFF CAUSING THE EE TO LOSE HIS BALANCE AND FALL BACKWARDS. H E ATTEMPTED TO BREAK HIS FALL WHICH RESULTED IN THE MAJORITY OF HIS BODY WEIGHT ON HIS RIGHT ARM AND WRIST.