AFO

abbreviation or noun

: an orthosis designed for the lower leg and foot

Regardless of surgical treatment, however, patients with foot drop should be prescribed an ankle foot orthosis (AFO) to achieve a near normal, safe gait pattern.

—James M. Brief et al., Bulletin of the NYU Hospital for Joint Diseases

AFOs can be either rigid (solid) or articulated (meaning, they have motion) at the ankle joint.

—Physical Therapy Products