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Orthotic and Prosthetic Design & Fabrication Flashcards

7 cards from real COC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In a Jewett hyperextension orthosis, the posterior force of the three-point system is applied at the:

    Answer: Thoracolumbar junction

    Sternal and pubic pads push posteriorly while the thoracolumbar pad pushes anteriorly to create extension.

  2. Moving the trimlines of a solid AFO anterior to the malleoli will:

    Answer: Increase resistance to ankle motion

    Anterior trimlines increase the cross-sectional stiffness of the plastic at the ankle.

  3. A ground reaction (floor reaction) AFO is most appropriate for a patient with:

    Answer: Crouch gait due to weak plantarflexors or quadriceps

    The anterior shell creates a knee extension moment to counter excessive stance knee flexion.

  4. A plantarflexion stop on an AFO produces what effect at initial contact?

    Answer: Knee flexion moment

    Blocking plantarflexion moves the tibia forward at loading, creating a knee flexion moment.

  5. An offset knee joint on a KAFO improves stance stability because the mechanical axis is placed:

    Answer: Posterior to the anatomical knee axis

    A posterior offset keeps the weight line anterior to the joint, extending the knee in stance.

  6. A bail (Swiss) lock on a KAFO is typically released by:

    Answer: Pushing the posterior bail against a chair edge

    The posterior bail unlocks both knee joints when pressed against a surface during sitting.

  7. The UCBL foot orthosis is designed primarily to:

    Answer: Control flexible hindfoot valgus (calcaneal eversion)

    Its deep heel cup and high medial-lateral trimlines hold the calcaneus in a corrected position.