Broken arms are a common injury that can occur from falls, sports injuries, or car accidents. Treatment options for a broken arm include a cast or splint to immobilize the broken bone, physical therapy to regain strength and range of motion, and in some cases, surgery. The specific bones in the arm that may be broken include the radius, ulna, or humerus. The recovery timeline for a broken arm can vary depending on the severity of the injury and the type of treatment, but it can take several weeks to several months for the bone to fully heal. Many are healed in 6 to 8 weeks.