An ulnar fracture refers to an interruption of the continuity and integrity of the ulna, which mostly occurs as a result of external forces, violent blows, and can also be caused by indirect violent twisting of the bone. In the case of blows, it can be due to iron or steel rod strikes, heavy object crushing, which directly leads to fracture of the ulna, which is often accompanied by severe local soft tissue contusions and sometimes open fractures can occur. Indirect violence refers to landing on the palm of the hand during a fall, which can lead to a fracture of the ulna due to twisting of the forehand, which is often accompanied by soft tissue and muscle damage around the pubic bone, and the soft tissue damage will be more pronounced, as will the swelling of the limb. Regardless of the cause of the ulnar fracture, it must be treated actively. If the fracture is well aligned, a cast brake can be applied. If the fracture is misaligned and repositioning does not restore normal alignment and alignment, surgical treatment should be used.