Which of the following muscle helps in the flexion of hip joint?

Flexors of hip: Psoas major and illiacus are the chief flexors of hip joint. Pectineus, rectus femoris, adductors and saorius are the accessory muscles. Adductors mainly the adductor longus paicipate in the early stages of flexion. Ref: Snell's clinical anatomy, 7th Edition, Page 611.