An ankle-foot orthosis, usually shortened to AFO, is one of the most commonly prescribed orthotic devices. It supports the ankle and foot, typically extending from somewhere below the knee down and under the foot, and is used to manage a range of walking difficulties rather than a single specific condition.
What an AFO does
An AFO's main job is to control unwanted or unsafe ankle and foot movement during standing and walking. This might mean holding the foot at a safer angle to prevent it dragging or catching (commonly known as foot drop), providing side-to-side ankle stability, or supporting overall alignment where muscle weakness or altered tone affects the lower leg. The specific goal — rather than the device category itself — usually determines the exact design chosen.
Common designs
AFOs range from rigid, solid-ankle designs that provide firm, consistent control throughout the walking cycle, to hinged or articulated designs that allow a controlled, safer range of ankle movement. Lighter, more flexible designs are sometimes used where the goal is simply to assist foot clearance without restricting movement heavily. Material, thickness and trim lines are all adjusted according to the level of support required.
When an AFO might be considered
AFOs are commonly discussed for conditions affecting the nerves or muscles controlling the lower leg, for recovery following certain injuries or surgeries, or simply where ankle instability is affecting balance and confidence while walking. Because the underlying causes vary so widely, an AFO should only be selected following a proper assessment by a qualified professional, rather than based on the general device category alone.
Getting the fit right
A well-fitted AFO should sit comfortably against the skin without excessive pressure points, work with — not against — appropriate footwear, and be reassessed periodically as walking patterns, footwear needs or the underlying condition change. Skin checks are an important habit for anyone wearing an AFO regularly, particularly in the early weeks of a new fitting.