Tendon of obturator internus

The tendon of the obturator internus originates from four or five tendinous bands, which are found on the deep surface of the obturator internus muscle. The tendon exits the pelvis through the lesser sciatic foramen, making a sharp turn around the ischium, and then inserts onto the medial surface of the greater trochanter of the femur.

The tendon of the obturator internus is notable for its relationship with the gemelli muscles (superior and inferior), which attach to it, forming a conjoined tendon (conjoined tendon of obturator internus and gemelli) that inserts onto the greater trochanter. This anatomical configuration is often referred to as the "hip triceps tendon" that plays a significant role in the external rotation and stabilization of the hip joint.