developing a sensor to track human body movement -- 2

I'm looking for a brilliant, experienced freelancer to develop a sensor to monitor certain body movements. The main purpose of this sensor is medical monitoring. Therefore, accuracy and reliability are essential. The preferred method of data collection I am looking for is wireless. Moreover, the primary body movements that the sensor should be able to track are rotational range of motion for the hand, knee and spine. If you have the skills needed to undertake this task, please get in touch as soon as possible.