Rectus Femoris Muscle Origin: Anterior inferior iliac spine and supraacetabular groove of ilium. Insertion: Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament. Action: Extends leg at knee joint; flexes thigh at hip joint. It is located: - anterior (superficial) to the iliofemoral ligament and the vastus intermedius muscle; - posterior (deep) to the sartorius muscle (at its proximal end); - medial to the tensor fasciae late and vastus lateralis muscles; - lateral to

RECTUS FEMORIS Why does rectus femoris, one of your quads, matter so much when it comes to back pain?Your quadriceps are comprised of four muscles, three of them, vastus medialis, intermedius and lateralis act exclusively to extend the knee - his is because the vastus group only cross the knee, a muscle that only crosses one joint is known as monoarticulate.The fourth quad, rectus femoris, is biarticulate, or it crosses both the hip and the knee and acts to extend the leg as well as being one of