 When ViMove testing is performed for both groups, 4 sensors will be adhered to the subjects skin using customised biocompatible adhesives. The placement of the sensors is determined through the use of templates which have been validated as part of the FDA 510K application. During testing, the sensors communicate data wirelessly to the RFD which is connected to a computer running dorsaVi ViMove software. Customised algorithms convert data generated by the software to meaningful biomechanical information, including measures such as range of movement, peak angles, speed of movement and muscle activation. 