An improved method and apparatus for restraining a patient's leg during knee surgery or similar procedure features and improved restraining member that is attachable to an operating room table. The restraining member has a lower concave portion that engages the upper portion and sides of the patient's leg. The restraining member has an upper convex portion that is reinforced with a plurality of ridges. The concave portion can be fitted with an inflatable bladder. The concave portion in other embodiments is fitted with a belt arrangement that enables different degrees of constriction to be imparted to the leg. In one embodiment, a base or cradle supports the leg from below. A top arc member is removably attachable to the base or cradle (pivotal connection or sliding connection). The top arc member is movable between open and closed positions.