A device is disclosed which measures motion characteristics of a human joint. The device includes a patient-worn brace mechanism having two pivotally-connected arms, the pivot point being provided by a rotary-controlled angle detector. Signals from the angle detector are received in a modular housing...http://www.google.com/patents/US5474088?utm_source=gb-gplus-sharePatent US5474088 - Device for measuring motion characteristics of a human joint
