What is the primary purpose of a double action ankle joint in an AFO?

The primary purpose of a double action ankle joint in an ankle-foot orthosis (AFO) is to assist with foot clearance during gait. This type of joint facilitates controlled dorsi- and plantarflexion movements, allowing for a more natural range of motion while walking. By enabling slight dorsiflexion when the wearer is in the swing phase of their gait, the double action ankle joint helps to prevent foot drop and ensures that the foot safely clears the ground during ambulation.

This feature is particularly important for individuals with conditions that impair their ability to lift their foot adequately, facilitating smoother and more efficient walking patterns. The mobility provided by the joint aids in maintaining balance and coordination, which are crucial for effective gait mechanics.