What is a characteristic of a custom articulating ankle-foot orthosis with anterior trim lines?

• A. Provide total contact and good amount of stability
• B. Locks the ankle in plantarflexion
• C. Eliminates subtalar motion
• D. Has posterior trim lines

Answer: (A)

An anterior trim line in a custom articulating ankle-foot orthosis increases the surface area that wraps around the leg and foot, giving a true total-contact fit. That expanded contact spreads pressure more evenly and stabilizes the ankle-foot complex during gait, helping control motion without sacrificing the ankle’s ability to move within the joint. Because it’s articulating, the device does not lock the ankle in plantarflexion, and subtalar motion isn’t completely eliminated—the design focuses on thoughtful contact and alignment to enhance stability. Posterior trim lines change the contact pattern but aren’t the defining feature of this type.