The iliopsoas muscle complex is made up of three muscles that include the iliacus, psoas major, and psoas minor. This complex muscle system can function as a unit or as separate muscles.. Psoas minor is only present in 60% to 65% of individuals.
The psoas muscle (also known as the iliopsoas) plays an important role in spinal stabilization and hip flexion. However, chronic tightness in the psoas can lead to low back and hip pain. Releasing the psoas requires a comprehensive approach to address the muscle itself as well as contributing factors.