Arm Fracture (Humerus/Radius/Ulna)

Car accidents can break arm bones in several ways. When people see a crash coming, they often throw their hands up toward the dashboard or steering wheel to protect themselves. The impact force travels up through the hands and can snap the forearm bones or upper arm bone. Side-impact crashes frequently cause arm fractures when the arm gets pinned between the body and the door or window.

The twisting and bending forces during a collision can also break arm bones even without direct impact. When the body gets thrown sideways or forward, the arm may get caught or twisted in an unnatural position. Rollover accidents are particularly dangerous for arm injuries because people can get tossed around inside the vehicle.

Older adults may suffer arm fractures from seemingly minor crashes because their bones are more fragile. Even a low-speed collision can generate enough force to crack weakened bones, especially if the person braces against the impact.

Most broken arms start with immediate splinting or partial casting to keep the bone pieces from moving around and causing more damage. Doctors typically prescribe pain medication and recommend ice to control swelling during the first few days. Simple breaks that line up well often heal successfully with just a cast or splint worn for six to eight weeks.

More complex fractures may require surgery to put the bone pieces back together properly. Surgeons can use metal plates, screws, pins, or rods to hold everything in place while the bone heals. This type of surgery (called open reduction and internal fixation) helps ensure the arm heals straight and strong.

After the bone heals enough to remove the cast, most people need physical therapy to regain normal strength and movement. The muscles and joints get stiff during weeks of immobilization, so rehabilitation focuses on gradually restoring flexibility and building back lost muscle mass. Some people also work with specialized hand therapists if the break affected their ability to grip or use their fingers normally.

Some broken arms develop complications that weren't obvious right after the accident. Nerve damage can occur if bone fragments press against nearby nerves, causing numbness, tingling, or weakness that may last months or become permanent. The radial nerve, which controls thumb movement and wrist extension, is particularly vulnerable with upper arm fractures.

Other people experience problems with how the bone heals. Sometimes broken bones heal in the wrong position, creating a permanent bend or twist in the arm. Bones can also heal too slowly or fail to heal completely, requiring additional surgery. Joints may become stiff and lose their normal range of motion, especially if the break was near the elbow or shoulder. These complications can significantly impact someone's ability to work or perform daily activities, particularly if the dominant arm is affected.