**Question:** Muscle attached to the anterior surface of greater trochanter

**Core Concept:** The greater trochanter is a bony projection on the anterior aspect of the femur, and various muscles attach to it.

**Why the Correct Answer is Right:** The muscle that attaches to the anterior surface of the greater trochanter is the gluteus medius. The gluteus medius is a key muscle in the hip abductor group and plays a crucial role in maintaining hip stability and balance during gait.

**Why Each Wrong Option is Incorrect:**

A. Gluteus minimus: This muscle is part of the same abductor group as gluteus medius but does not specifically attach to the anterior surface of the greater trochanter.

B. Gluteus minimus: As mentioned earlier, gluteus minimus is not the correct answer.

C. Sartorius: This muscle is a long, flat, and thin muscle that runs along the medial side of the thigh and does not attach to the greater trochanter.

D. Sartorius: Similar to option C, the sartorius is not the correct muscle attaching to the anterior surface of the greater trochanter.

**Clinical Pearl / High-Yield Fact:** A comprehensive understanding of muscle attachments to the greater trochanter is essential for correctly diagnosing and treating conditions like trochanteric bursitis, a common cause of lateral hip pain.

**Correct Answer:** Gluteus medius

**Why the Correct Answer is Right:** Gluteus medius is a key muscle in maintaining hip stability, particularly during gait, and plays a crucial role in preventing excessive internal rotation and abduction of the femur at the hip joint. The muscle originates from the greater trochanter and inserts onto the lateral aspect of the greater trochanter, ensuring it has direct contact with the anterior surface of the trochanter.

**Why Each Wrong Option is Incorrect:**

A. Gluteus minimus: Although both gluteus minimus and medius are part of the hip abductor group, gluteus minimus does not specifically attach to the anterior surface of the greater trochanter.

B. Sartorius: This muscle originates from the anterior superior iliac spine and inserts onto the medial aspect of the tibia, not the anterior surface of the greater trochanter.

C. Sartorius: Similar to option B, the sartorius is not involved in attaching to the anterior surface of the greater trochanter.