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Zona orbicularis

Ligament of the hip

Field	Value
Name	Zona orbicularis
Latin	zona orbicularis articulationis coxae
Image	Gray343.png
Caption	Capsule of hip-joint (distended). Posterior aspect. (Zona orbicularis labeled at center bottom.)

The zona orbicularis or annular ligament is a ligament on the neck of the femur formed by the circular fibers of the articular capsule of the hip joint. It is also known as the orbicular zone, ring ligament, and zonular band.{{cite web | access-date = 21 June 2009 | archive-date = 22 July 2011 | archive-url = https://web.archive.org/web/20110722180057/http://www.irishhealth.com/dictionary.html?query=zona%20orbicularis | url-status = dead

Structure

The zona orbicularis forms a ring around the neck of the femur. The articular capsule is much thicker above and in front of the joint, where the greatest amount of resistance is required, and thin and loose behind and below the joint.

The capsule consists of two sets of fibers, circular and longitudinal. The circular fibers, the zona orbicularis, are most abundant at the lower and back part of the capsule where they form a sling or collar around the femoral neck. Anteriorly, they blend with the deep surface of the iliofemoral ligament, and gain an attachment to the anterior inferior iliac spine.Gray's Anatomy (1918), 7a3

Function

The zona orbicularis and proximal hip joint capsule are poorly understood. Recent studies seem to confirm that the proximal to middle part of the articular capsule, including the zona orbicularis, acts biomechanically as a locking ring wrapped around the femoral neck and thus is a key structure for hip stability in distraction. It tightens the joint capsule of the hip when iliopsoas muscle contracts.

Additional images

File:Gray342.png|Front view of hip joint with capsular ligament largely removed Zona orbicularis used as arthroscopic landmark for iliopsoas muscle.

Notes

References

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References

(October 2013). "Capsular Laxity of the Hip: Findings at Magnetic Resonance Arthrography". Arthroscopy: The Journal of Arthroscopic & Related Surgery.
Ito H. ''et al'' (2009)
(December 2011). "Capsular Management During Hip Arthroscopy: From Femoroacetabular Impingement to Instability". Arthroscopy: The Journal of Arthroscopic & Related Surgery.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

ligaments-of-the-lower-limb

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