Hip flexion is best described as:

• A. Moving the thigh toward the chest
• B. Moving the thigh away from the midline
• C. Rotating the leg externally
• D. Extending the knee

Answer: (A)

Hip flexion is the movement that brings the thigh toward the trunk, reducing the angle between the thigh and the pelvis. Describing it as moving the thigh toward the chest captures this action precisely. This is different from moving the thigh away from the midline (hip abduction), rotating the leg externally (hip external rotation), or extending the knee (a knee joint action, not the hip). Activities like leg raises, bringing the knee toward the chest, or performing a sit-up all involve hip flexion as the hip joint angle closes.