What is the described function of the walk aid?

• A. A device that uses a tilt sensor and accelerometer to stimulate the common peroneal nerve to lift the foot at the right time during gait
• B. A device that delivers continuous ankle stretching
• C. A device that strengthens leg muscles through resistance
• D. A device that reduces shoe size automatically

Answer: (A)

This walk aid is describing a functional electrical stimulation device for foot drop. It uses a tilt sensor and an accelerometer to detect the phase of walking and then stimulates the common peroneal nerve so the dorsiflexor muscles (like the tibialis anterior) contract at the right moment to lift the front of the foot during the swing phase. The timing is key: stimulation occurs when the foot needs to clear the ground, helping prevent toe drag and improve gait stability. The other options don’t fit this mechanism—continuous ankle stretching is a passive therapy, strengthening with resistance is about muscle training, and automatically reducing shoe size isn’t a function of a walk aid.