A sensor and method for providing orientation data regarding a patients pelvic axis is disclosed. The sensor includes a three axis tilt sensor a wireless communication module a power source and a microcontroller. The microcontroller is in electronic communication with the three axis tilt sensor, the wireless communication module, and the power source so as to control the three axis tilt sensor and the wireless communication module so that the sensor is configured to measure and report on an orientation of a pelvic axis of a patient to whom the sensor has been connected in a known orientation. The microcontroller is able to control the sensor in order to maximize the power draw and extend the life of the portable power source.
