What moment is occurring at the hip during the foot flat phase of gait?

During the foot flat phase of gait, the hip experiences a flexion moment. This phase occurs as the foot makes contact with the ground and the body weight shifts over the supporting limb. As this happens, the hip flexors are engaged to control and stabilize the position of the thigh.

At this point in the walking cycle, the hip is not fully extended; rather, it starts from a position approaching full extension and moves towards flexion as the trunk moves forward and the knee begins to flex to absorb the shock of landing. The hip flexion moment helps facilitate forward motion and prepares the body for the subsequent phases of gait.

In contrast, the extension moment would be expected during the push-off phase, when the body is preparing to propel itself forward. Understanding the mechanics of the foot flat phase is critical for effective gait analysis, rehabilitation strategies, and managing conditions that may affect gait dynamics.