Which muscles are included in the hip external rotator group emphasized during gait analysis?

Which muscles are included in the hip external rotator group emphasized during gait analysis?

• A. Iliopsoas and rectus femoris
• B. Tibialis anterior and EHL
• C. Gluteus minimus and TFL only
• D. Six short external rotators, posterior fibers of gluteus medius, and gluteus maximus

Answer: (D)

During gait analysis, the muscles that drive external rotation of the hip are the six short external rotators, plus the posterior fibers of the gluteus medius and the gluteus maximus. The six short external rotators—piriformis, superior gemellus, obturator internus, inferior gemellus, obturator externus, and quadratus femoris—sit deep in the hip and actively rotate the femur outward, helping to position the foot for progression and stabilize the hip as the leg moves through stance and swing. The posterior fibers of the gluteus medius contribute external rotation when the hip is flexed, aiding rotation during swing, while the gluteus maximus provides strong external rotation, especially when the hip is extended during late stance and push-off for propulsion and control of knee alignment. This group is emphasized in gait analysis because external rotation of the hip influences knee alignment, the foot progression angle, and pelvic stability throughout the gait cycle. The other options either involve hip flexors, which flex rather than rotate outward; ankle muscles, which act far from the hip; or a limited subset that doesn’t capture the full external-rotator group.

During gait analysis, the muscles that drive external rotation of the hip are the six short external rotators, plus the posterior fibers of the gluteus medius and the gluteus maximus. The six short external rotators—piriformis, superior gemellus, obturator internus, inferior gemellus, obturator externus, and quadratus femoris—sit deep in the hip and actively rotate the femur outward, helping to position the foot for progression and stabilize the hip as the leg moves through stance and swing. The posterior fibers of the gluteus medius contribute external rotation when the hip is flexed, aiding rotation during swing, while the gluteus maximus provides strong external rotation, especially when the hip is extended during late stance and push-off for propulsion and control of knee alignment. This group is emphasized in gait analysis because external rotation of the hip influences knee alignment, the foot progression angle, and pelvic stability throughout the gait cycle. The other options either involve hip flexors, which flex rather than rotate outward; ankle muscles, which act far from the hip; or a limited subset that doesn’t capture the full external-rotator group.