What Does the Obturator Internus Do

The obturator internus (OI) is a hip muscle that originates deep within the pelvis, wraps out and inserts on the posterior aspect of the femur head (the top of the thigh bone when it combines to form the hip joint). The main movement function of the OI is to rotate the leg externally.

What is the main function of the obturator internus?

Function. Due to their attachment on the greater trochanter of the femur, obturator internus and the gemelli muscles act as external (lateral) rotators of the extended thigh. They also abduct the flexed thigh.

How do you activate the obturator internus?

Bring the soles of your feet together and pull your heels as close to your groin as possible without causing pain. Hold the stretch as you breathe deeply for several minutes. Then bring your knees together and up which will push your feet to the floor and hold that position for ten seconds.