Which muscles are the primary hip abductors emphasized in the lecture?

Which muscles are the primary hip abductors emphasized in the lecture?

• A. Gluteus maximus and hamstrings
• B. Iliopsoas and rectus femoris
• C. Adductor magnus and sartorius
• D. Gluteus medius and gluteus minimus

Answer: (D)

The main concept here is identifying the primary muscles that move the thigh away from the body's midline and stabilize the pelvis. The gluteus medius and gluteus minimus are located on the outer surface of the pelvis and attach to the greater trochanter. When they contract, they pull the femur outward in the frontal plane and, crucially during walking, keep the pelvis level when the opposite leg is lifted. This pelvic stabilization is a defining role of these two muscles, making them the primary hip abductors emphasized in most lectures. The other muscles listed do not serve as the main abductors. Gluteus maximus is primarily an extensor and external rotator of the hip; the hamstrings cross the hip and mainly extend the hip rather than abduct it; iliopsoas and rectus femoris are hip flexors; adductor magnus is primarily an adductor, and sartorius mainly assists in flexion and diagonal movements rather than primary abduction.

The main concept here is identifying the primary muscles that move the thigh away from the body's midline and stabilize the pelvis. The gluteus medius and gluteus minimus are located on the outer surface of the pelvis and attach to the greater trochanter. When they contract, they pull the femur outward in the frontal plane and, crucially during walking, keep the pelvis level when the opposite leg is lifted. This pelvic stabilization is a defining role of these two muscles, making them the primary hip abductors emphasized in most lectures.

The other muscles listed do not serve as the main abductors. Gluteus maximus is primarily an extensor and external rotator of the hip; the hamstrings cross the hip and mainly extend the hip rather than abduct it; iliopsoas and rectus femoris are hip flexors; adductor magnus is primarily an adductor, and sartorius mainly assists in flexion and diagonal movements rather than primary abduction.