Abstract: A device which is adapted to be mounted on the edge of an operating table for holding a patient's thigh or upper leg in a fixed position on the table while arthroscopic surgery is being performed on the patient's knee. An inflatable member is secured on a first curved metal retention plate which is mounted on a flat metal portion of an angled base plate. The inflatable member is wrapped about the thigh of the patient and is secured thereon by fastening means. A second curved metal retention plate is adjustably mounted on the flat portion of the angled base plate opposite of the first retention plate. This second plate is moved into an adjusted position against the inflatable member diametrically opposite of the first retention plate to securely hold the patient's thigh and inflatable member between the pair of curved retention plates.