 An initial limited data set, obtained by Reflexion Health, provided validity and reliability measures. Eighteen degrees of absolute difference was detected between manual goniometry and Kinect measurements in relevant planes of movement utilized during prescribed ACL exercise. Good relative agreement between RMT and goniometry scores was obtained ICC 0.89. A correctable systematic bias toward underestimation by the RMT will allow for future more accurate estimations of joint positioning improving face validity. 