Iliopsoas

Iliopsoas is sometimes classified as two muscles, Iliacus and Psoas major, with Iliacus arising from the Ilium and Psoas from the vertebrae.

Origin

• Inner surface of the Ilium
  
  
• Base of the sacrum
  
  
• Sides of the bodies of T12-L5

Insertion

• Lesser trochanter of the femur

Actions

• Flexion of the hip
  
  
• Lateral rotation of the hip
  
  
• Flexes torso when the legs are fixed (e.g. laying to sitting)

Innervation

• Femoral nerve and branches of the lumbar plexus

Daily uses

• Climbing a step

Example stretches

• Hip flexor stretch

Example strengthening exercises

• Seated hip flexion with a resistance band
  
  
• Standing hip flexion with a resistance band

Related injuries

• Iliopsoas inflammation
  
  
• Iliopsoas rupture

Related muscles

• Rectus femoris