College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What is the primary function of the rectus femoris muscle?

hip flexion
knee flexion
hip extension
knee extension

The correct answer is: hip flexion

The primary function of the rectus femoris muscle is indeed hip flexion. This muscle is one of the four components of the quadriceps group located at the front of the thigh. It plays a crucial role in movements that involve raising the thigh toward the torso, which is essential in numerous activities, such as walking, running, and kicking. In addition to its role in hip flexion, the rectus femoris also facilitates knee extension because it crosses both the hip and knee joints. However, its primary action, especially in isolation, is to assist in flexing the hip joint rather than extending or flexing the knee. The other functions mentioned may occur, but they are not the main action of the rectus femoris. This dual role can sometimes lead to misunderstandings about its primary function, but hip flexion is the most significant and defining action of this muscle.