Abstract: The present invention is directed to a system and method which allows for the mounting of a medical navigation system external to a patient. In one embodiment, displacement device is mounted around a patient's torso and serves to displace (e.g., distract or compress) the patient's skeleton in a manner such that the target site becomes fixed relative to a site on the displacement device. A navigation transmitter can then be mounted to the displacement device. The device has a quick disconnect that allows it to be removed without first releasing the displacement. Displacement can be controlled by pneumatic, hydraulic, electrical or by screw action. In one embodiment, the device can be used to position a patient on an operating table.