Quadratus femoris muscle

The quadratus femoris is a flat, quadrilateral skeletal muscle. Located on the posterior side of the hip joint, it is a strong external rotator and adductor of the thigh,[2] but also acts to stabilize the femoral head in the acetabulum. Quadratus femoris use in the Meyer's muscle pedicle grafting to prevent avascular necrosis of femur head.

Quadratus femoris muscle
The quadratus femoris and nearby muscles
Muscles of the gluteal and posterior femoral regions with quadratus femoris muscle highlighted
Details
Origin	Ischial tuberosity
Insertion	Intertrochanteric crest
Artery	medial circumflex femoral artery
Nerve	Nerve to quadratus femoris (L4-S1)
Actions	lateral rotation and adduction of thigh[1]
Identifiers
Latin	musculus quadratus femoris
TA	A04.7.02.015
FMA	22321
Anatomical terms of muscle

Course

It originates on the lateral border of the ischial tuberosity of the ischium of the pelvis.[1] From there, it passes laterally to its insertion on the posterior side of the head of the femur: the quadrate tubercle on the intertrochanteric crest and along the quadrate line, the vertical line which runs downward to bisect the lesser trochanter on the medial side of the femur. Along its course, quadratus is aligned edge to edge with the inferior gemellus above and the adductor magnus below, so that its upper and lower borders run horizontal and parallel.[3]

At its origin, the upper margin of the adductor magnus is separated from it by the terminal branches of the medial femoral circumflex vessels.

A bursa is often found between the front of this muscle and the lesser trochanter. Sometimes absent.

Clinical significance

Groin pain can be a disabling ailment with many potential root causes: one such cause, often overlooked, is quadratus femoris tendinitis. Magnetic resonance imaging can show abnormal signal intensity at the insertion of the right quadratus femoris tendon, which suggests inflammation of the area.[4] Since the muscle works to laterally rotate and adduct the femur, actions involving the lower body can strain the muscle. In addition, patients present with hip pain and an increased signal intensity of the MRI of the quadratus femoris have been shown to also have a significantly narrower ischiofemoral space compared to the general populace. The ischiofemoral impingement may be a cause of the hip pain associated with quadratus femoris tendinitis.[5]

Quadratus femoris muscle

Additional images

• 
  Right femur. Posterior surface.
• 
  Structures surrounding right hip-joint.
• 
  Nerves of the right lower extremity Posterior view.
• 
  Quadratus femoris muscle
• 
  Muscles of Thigh. Anterior views.

Notes

1. Thieme Atlas of Anatomy (2006), p 424
2. Platzer (2004), p 238
3. Mcminn (2003), p 166
4. Klinkert, P. (1997). "Quadratus femoris tendinitis as a cause of groin pain" (PDF). British Journal of Sports Medicine. 31: 348–349. doi:10.1136/bjsm.31.4.348 – via BMJ.
5. Torriani, Martin; Souto, Silvio C. L.; Thomas, Bijoy J.; Ouellette, Hugue; Bredella, Miriam A. (2009-07-01). "Ischiofemoral Impingement Syndrome: An Entity With Hip Pain and Abnormalities of the Quadratus Femoris Muscle". American Journal of Roentgenology. 193 (1): 186–190. doi:10.2214/AJR.08.2090. ISSN 0361-803X.

References

This article incorporates text in the public domain from page 477 of the 20th edition of Gray's Anatomy (1918)

• Mcminn, R.M.H. (2003). Last's Anatomy Regional and Applied. Elsevier Australia. ISBN 0-7295-3752-8.
• Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol 1: Locomotor system (5th ed.). Thieme. ISBN 3-13-533305-1. (ISBN for the Americas 1-58890-159-9.)
• Thieme Atlas of Anatomy. Thieme. 2006. ISBN 978-1-60406-062-1.

External links

• PTCentral
• Anatomy photo:13:st-0409 at the SUNY Downstate Medical Center