The two main bones of the forearm are the radius and the ulna. Broken bones occur when there is a sudden, acute pressure, such as a fall on an outstretched wrist. The most common break usually involves the end of the radius and a portion of the ulna bone known as the ulnar styloid. Pieces of the broken bone are displaced out of their normal position. The force causing the break in bones is quite significant, and naturally that force also can tear the ligament connections between the bones.
Treatment of most fractures consists of realigning the bones in their normal position. Most commonly this is done without the necessity of surgery. It is held in position by using a cast or brace to immobilize the wrist, hand, and forearm – usually for 6-8 weeks.