Abstract: A disposable splint for holding a broken leg of a patient in traction is made of layered, corrugated cardboard or the like and has central, side and end panels. The panels at a proximal end are foldable to form an open end to engage the ischia of the patient. The side panels are foldable to be perpendicular to the central panel. At the distal end, a panel is foldable to form a foot plate having a central opening through which a tension strap can be passed from the patient's ankle to a tension rod. On the outer surface of the foot plate, laterally extending flaps are foldable to form supports with central slots to receive the tension rod. When applied to a patient, the leg is placed in traction manually, the splint is applied and the tension strap and rod are used to maintain the leg in traction so that the patient can be safely transported for further medical care.