Which muscles are the prime movers for hip flexion?

Which muscles are the prime movers for hip flexion?

• A. Rectus femoris & Sartorius
• B. Psoas major & Iliacus
• C. Gluteus maximus & Hamstrings
• D. Adductor longus & Gracilis

Answer: (B)

Hip flexion is driven mainly by the iliopsoas, the combination of psoas major and iliacus. These muscles cross the front of the hip joint and pull the femur forward toward the pelvis with great power, making them the primary movers when you lift the thigh up. They originate from the lumbar spine and iliac fossa and insert on the lesser trochanter, giving them a strong mechanical advantage for bending the hip. Other muscles listed can assist or oppose hip flexion but aren’t the main drivers. The gluteus maximus and hamstrings are hip extensors, pulling the thigh back. Adductor longus and gracilis mainly act as adductors and only contribute to flexion modestly. Rectus femoris can flex the hip as part of its role in the quadriceps, but it’s also a knee extensor, so it isn’t the primary hip flexor in most situations. Therefore, the iliopsoas (psoas major with iliacus) is the best answer for the prime movers of hip flexion.

Hip flexion is driven mainly by the iliopsoas, the combination of psoas major and iliacus. These muscles cross the front of the hip joint and pull the femur forward toward the pelvis with great power, making them the primary movers when you lift the thigh up. They originate from the lumbar spine and iliac fossa and insert on the lesser trochanter, giving them a strong mechanical advantage for bending the hip.

Other muscles listed can assist or oppose hip flexion but aren’t the main drivers. The gluteus maximus and hamstrings are hip extensors, pulling the thigh back. Adductor longus and gracilis mainly act as adductors and only contribute to flexion modestly. Rectus femoris can flex the hip as part of its role in the quadriceps, but it’s also a knee extensor, so it isn’t the primary hip flexor in most situations. Therefore, the iliopsoas (psoas major with iliacus) is the best answer for the prime movers of hip flexion.