For a four-year-old child with spina bifida at the S1 level who aims to ambulate independently, which device is MOST appropriate?

• A. Reciprocating gait orthosis
• B. Knee-ankle-foot orthoses
• C. Ankle-foot orthoses
• D. Parapodium

Answer: (C)

For a child with spina bifida at sacral level who aims to walk independently, the focus is on stabilizing the ankle while preserving knee and hip function for a more natural, energy-efficient gait. At this level, knee and hip muscles are typically usable, so you want an orthosis that provides precise ankle-foot control without immobilizing the knee. An ankle-foot orthosis does exactly that: it supports the ankle in stance, improves foot alignment, prevents foot drop, and enhances foot clearance during swing, enabling a more effective, independent gait with minimal equipment.

Other devices add more proximal stability or transfer more control to the knee or hip, which isn’t necessary here and can hinder energy efficiency and natural movement. A device that stabilizes the knee and ankle together (like knee-ankle-foot orthoses or a reciprocating gait orthosis) is more appropriate for higher lesions with poor knee function. A parapodium is useful for early standing and limited walking but isn’t ideal for independent, mature gait in a child of this age. Therefore, the ankle-foot orthosis is the best choice to support independent ambulation at this level.