There are five types of hip flexor muscles: the iliacus, pectineus, psoas major, rectus femoris, and sartorius muscles. You use these muscles to lift your knees and bend forward at the hip.

The iliacus is a key part of the larger and better-known hip flexor (the other main muscle being the psoas). Together, the iliacus and the psoas make up the hip muscle group that connects the ...

Your hip flexors are a group of muscles primarily responsible for lifting your knees and bending at the waist. These include: • Iliopsoas: The powerhouse of hip flexion, a combination of two muscles — ...