the hip flexors are a group of muscles that you use when you pull your knee upward. this movement is called hip flexion. the major hip flexors are the psoas major rectus femoris and iliacus muscles. the hip flexors are anchored into the spine and pelvis and attach to the leg (mainly the femur or thigh bone) by tendons. hip flexor strains (pulled muscles) cause pain in the front of the hip when trying to raise the knee.
what is the hip flexor?