ABC Orthotic & Prosthetic Practice Exam

When fabricating a thermoplastic articulated AFO (ankle-foot orthosis), the placement of the mechanical ankle joints is crucial for optimal function and alignment of the orthosis. The mechanical ankle joints should be positioned at the level of the distal border of the medial malleolus. This specific location allows for proper articulation and movement while mimicking the natural axis of the ankle joint.

Placing the joints at this level facilitates appropriate range of motion and alignment, helping the individual achieve a more natural gait and improving stability. It also ensures that the forces transmitted through the orthosis align closely with the biomechanical demands placed on the lower limb during activities like walking. Additionally, positioning at the distal border of the medial malleolus is crucial for integrating the orthosis with the foot and maintaining compatibility with shoe wear.

Understanding the anatomy of the ankle and the function of mechanical joints in an AFO is essential for creating a tailored solution that supports the clinical needs of the patient. This technique enhances comfort, control, and overall efficacy of the orthotic device in daily use.