In which phase is the ground reaction force found posterior to the knee and ankle, and anterior to the hip?

The phase in which the ground reaction force is found posterior to the knee and ankle while being anterior to the hip is the terminal swing phase. During this phase, the leg is preparing to make contact with the ground again, impacting the positioning of the body relative to the ground forces.

In terminal swing, the hip joint is flexed, and the knee is extended as the limb moves forward in preparation for the next initial contact. The ground reaction force acts on the body’s center of mass, and since the knee and ankle joints are positioned with the foot ahead of the hip, the resultant force acts posteriorly to those joints. This positioning is crucial for controlling the limb’s momentum and ensuring stability upon landing.

Understanding the dynamics of ground reaction forces during the gait cycle is vital for designing effective prostheses and orthotic devices. A thorough comprehension of these mechanics can help address gait abnormalities and optimize function for individuals using assistive devices.