7.2. AlterG Bionic LegThe AlterG Bionic Leg is a commercially available, unilateral, powered knee orthosis designed for the treatment of neurological and orthopedic conditions. The device can be used for a variety of tasks including transfers, ambulation on even surfaces and stair climbing/descent. The device utilizes multiple sensors, including force sensors in the shoe, to interpretauser’s movement and respond with appropriate assistance. In a randomized controlled pilot study of individuals with chronic stroke, an 18 hour, 6 week intervention with the Bionic Leg was found to be no more effective in improving gait velocity than sham physical therapy(Stein,Bishop,Stein,&Wong, 2014).