Which two muscle groups does a GRAFO assist?

A GRAFO, or Ground Reaction Ankle-Foot Orthosis, is designed to assist the function of specific muscle groups during gait and standing activities. In particular, it primarily supports the ankle plantar flexors and knee extensors.

The ankle plantar flexors, which include muscles like the gastrocnemius and soleus, play a critical role in pushing the foot off the ground during walking and running. When these muscles are weakened or not functioning properly, a GRAFO helps by providing external support during the stance phase of gait, ensuring stability and aiding in forward motion.

Simultaneously, the knee extensors, primarily represented by the quadriceps muscle group, are essential for extending the knee and providing stability during weight-bearing activities. A GRAFO can assist these muscles by improving alignment and facilitating the extension of the knee, allowing for more effective lower limb function.

In contrast to the muscle groups mentioned in the other answer choices, such as hip flexors or ankle dorsiflexors, the primary focus of a GRAFO is to aid those specifically involved in the stance and propulsion phases of walking. Therefore, while other muscles also play important roles in lower extremity mechanics, the GRAFO specifically targets the plantar flexors and