Etymology: As, lang + earm, arm; ONorse, kasta
an orthopedic cast applied to immobilize the arm from the hand to the upper arm. It is used in treating fractures of the forearm, elbow, and humerus; for maintaining postoperative positioning of the distal arm, elbow, or upper arm; and for correcting or maintaining the correction of deformities of the distal arm, wrist, or elbow. See also cast. Compare short-arm cast.