What is the fuction of Psoas Major Muscle?

Function:

1. Flexion of hip joint:

- Primary flexor of hip joint

- Powerful at lower angles of hip flexion, less effective near full hip flexion

- Action: It flexes the thigh at the hip joint.

2. Weak lateral rotator of the hip joint:

- Lateral rotation is produced when hip is slightly flexed

- Action: It causes the thigh to rotate laterally at the hip joint.

Innervation:

* Ventral rami (anterior divisions) of L1–L3 spinal nerves

Actions:

- Flexion of the hip

- Weak lateral rotation of the hip

Attachments:

- Origin: Lumbar vertebrae (bodies, transverse processes, and intervertebral discs of T12 – L5)

- Insertion: Lesser trochanter of femur

Clinical relevance:

- Can cause or contribute to low back pain