An arm harness for applying at least one of distractive and abductive force to a human shoulder has at least two restrictor features mounted on a torso strap to be placed around a patient's waist. A first restrictor feature serves as a fulcrum at a restriction point on the arm spaced from the elbow to limit movement of the arm in one direction at the restriction point. The second restrictor feature applies force to the arm spaced both from the restriction point and from the elbow. In one embodiment, the first restrictor feature is positioned to limit movement of the forearm toward the shoulder, and the second restrictor feature applies force to the wrist to urge the wrist to move toward the shoulder, thereby applying axial distractive force to the shoulder joint. In another embodiment, the first restrictor feature is placed between the upper arm and the torso. The second restrictor feature urges the elbow toward the torso, thereby applying lateral distractive force to the shoulder joint. The two types of restrictor feature pairs may be combined in an arm harness that provides both axial and lateral distraction to the shoulder joint.