Abstract: A surgical leg clamp assembly for securing the thigh of a patient to an operating table for arthroscopy of the knee and arthroscopic and/or knee surgery. The surgical leg clamp consists of an elongate main frame which is universally adjustably secured to the side of an operating table and which is provided with an easily adjustable thigh-encircling snap-belt clamp assembly which is adapted to incrementally apply selective continuous clamping pressure to the thigh without resultant discomfort or damage thereto. The surgical leg clamp assembly is also adapted for selected snap-release and reapplication of the selected retentive pressure without the need for further readjustment of the surgical leg clamp assembly to reachieve the original clamping pressure.