The psoas muscle arises from the transverse processes of the lumbar spine, while the iliac muscle arises from the inner surface of the ilium. Both insert along the medial aspect of the proximal femur, primarily at the lesser trochanter, and act as the primary flexors of the hip.
Reproduced with permission from: Novachek TF. Adductor and Iliopsoas Release. In: Operative Techniques in Orthopedic Surgery, Wiesel SW (Eds), Lippincott Williams & Wilkins, Philadelphia, 2011. Copyright © 2011 Lippincott Williams & Wilkins.
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