What are the three forces involved in the 3-point pressure system for a Ground Reaction AFO?

The three forces involved in the 3-point pressure system for a Ground Reaction Ankle-Foot Orthosis (AFO) play a crucial role in ensuring proper biomechanics and stability for the patient. In this context, having a posterior directed force at the tibial plateau is significant, as it helps to limit excessive dorsiflexion during ambulation by providing an antigravity counterforce.

The superior directed force at the plantar aspect of the calcaneus provides support and helps to resist tibial progression, making it crucial for maintaining proper posture and balance. This force also contributes to the overall alignment of the lower limb. Lastly, the superior directed force at the plantar aspect of the footplate and toes aids in pushing up against the foot, facilitating control during gait.

The combination of these forces establishes a balanced system that effectively distributes pressure across the orthosis, promoting functional mobility and stability. This 3-point pressure system is integral to the design and purpose of the Ground Reaction AFO, which aims to provide both support and correction for individuals with specific gait abnormalities.