Final answer:
The gluteus medius is essential in stabilizing the pelvis and maintaining a level walking pattern, in addition to facilitating leg abduction and medial rotation during normal human locomotion.
Step-by-step explanation:
The primary function of the gluteus medius during normal human locomotion is to stabilize the pelvis and to prevent the dropping of the opposite hip, which helps to maintain a level gait. As part of the gluteal group, the gluteus medius is one of the muscles that insert on the femur and originates on the pelvic girdle.
Its role in stabilizing the iliotibial tract is crucial for proper leg movement, especially during activities like walking or running. The gluteus medius also assists with movements such as abduction (raising the knee at the hip) and medial rotation of the thigh.