Which muscle is primarily responsible for hip extension?

The muscle primarily responsible for hip extension is the gluteus maximus. This large muscle, located in the posterior portion of the pelvis, plays a critical role in extending the hip joint, which is essential for various movements such as walking, running, and climbing stairs.

The gluteus maximus not only contributes to extending the hip when moving from a flexed position but also helps stabilize the pelvis and supports the spine during dynamic activities. Its powerful contraction aids in actions that require forceful hip movement, making it vital for athletic performance and everyday activities.

The other muscles listed, such as the rectus femoris, tensor fasciae latae, and sartorius, are involved in different functions. The rectus femoris mainly functions in hip flexion and knee extension. The tensor fasciae latae assists in hip abduction and medial rotation, while the sartorius also acts primarily as a hip flexor and external rotator. None of these muscles play a predominant role in hip extension like the gluteus maximus does.