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The Quadratus Femoris is a member of the Deep Lateral Rotator Group (also known as the Deep 6), composed of the following six muscles (from superior to inferior):
- Superior gemellus
- Obturator internus
- Inferior gemellus
- Obturator externus
- Quadratus femoris
- The quadratus femoris attaches from the ischial tuberosity to the intertrochanteric crest of the femur.
- Laterally rotates the thigh at the hip joint.
- Horizontally abducts the thigh at the hip joint.
- Adducts the thigh at the hip joint.
- Contralaterally rotates the pelvis at the hip joint.
NOTE: The quadratus femoris is usually the largest member of the deep lateral rotator group.