Fig. 2

BioTone™ toolkit for lower-extremity assessment of spasticity using the pendulum test. Top: Electromyographic (EMG) electrodes are placed on extensor and flexor muscles and used to ensure muscle relation prior to the start of testing and to monitor involuntary contractions during the test, and fibre-optic goniometer (FOG) system used to measure knee angle during the pendulum test. Bottom: Pendulum test metrics include the plateau angle (Plat), first flexion amplitude (F1amp), and first extension amplitude (E1amp) which are used to compute the relaxation index (RI) and the extension relaxation index (ERI)