Bioness out of Valencia, California has received U.S. FDA approval for its NESS L300 Plus System, 
a combination of the NESS L300 Foot Drop System with a thigh stimulation device. Intended for patients with upper motor neuron injury, post stroke, and other conditions, the system helps with knee flexion and extension, as well as ankle dorsiflexion.
From the announcement:
The NESS L300 Plus builds on the proven success of Bioness’ NESS L300 Foot Drop System and is designed to additionally stimulate the muscles of the thigh. The addition of the thigh stimulation cuff, synchronized with a wireless heel sensor to detect when the foot is on or off the ground, controls the knee, making it easier to walk. Historically, patients have relied on rigid plastic braces which restrict thigh and ankle movements and can lead to additional problems, including increased falls.
Product page: NESS L300 Foot Drop System…
Press release (pdf): BIONESS INC. RECEIVES FDA CLEARANCE OF ITS NESS L300 PLUS SYSTEM…