Which statement describes a molded solid-ankle AFO?

• A. The widest posterior shell is typically solid plastic
• B. It has trimlines crossing the malleoli
• C. It relies on metal uprights for support
• D. It uses no calf band

Answer: (A)

The main idea here is understanding what defines a molded solid-ankle AFO. This design is a single, solid plastic shell that surrounds the foot and ankle to provide rigid immobilization. The hallmark feature is a broad, wide posterior portion of the shell, which envelops the hindfoot and ankle to maximize stability and limit motion across the ankle joint.

That broad posterior shell is what makes a molded solid-ankle AFO effective for controlling ankle movements and supporting alignment during gait. It also explains why metal uprights aren’t used in this type—the goal is a continuous, rigid plastic enclosure rather than a frame with separate supports.

The other statements don’t fit this design: trimlines crossing the malleoli would compromise the posterior containment and aren’t typical of a solid-ankle design; reliance on metal uprights contradicts the all-plastic, enclosed construction; and most molded solid-ankle AFOs use a calf band to help secure the device, so saying there is no calf band isn’t characteristic of it.

So, the widest posterior shell described as solid plastic best matches the molded solid-ankle AFO.