A surgical support apparatus for supporting and positioning a patient's limb or an instrument during surgical procedures. The apparatus consists of an adjustable structural component which houses a separate hydraulic system used for locking and unlocking the structural apparatus. The structural component includes three lockable joints and two rigid support arms. Each joint houses a hydraulic piston and a locking ring. Hydraulic pressure is supplied to the joints by an electric motor and pump and is controlled by an electric circuit, pressure sensors and valves. When hydraulic pressure is applied, the pistons are activated, locking the joints. Hydraulic pressure can also be released to unlock the joints through a user control circuit. The structural component also includes a universal rail clamp to attach the device to a support structure and a distal quick connect for attachment of accessory devices.
