Thezona orbicularisorannular ligamentis aligamenton theneckof thefemurformed by the circular fibers of thearticular capsuleof thehip joint.It is also known as the orbicular zone, ring ligament, and zonular band.[1]
| Zona orbicularis | |
|---|---|
 Capsule of hip-joint (distended). Posterior aspect. (Zona orbicularis labeled at center bottom.) | |
| Details | |
| Identifiers | |
| Latin | zona orbicularis articulationis coxae |
| TA98 | A03.6.07.002 |
| TA2 | 1874 |
| FMA | 42960 |
| Anatomical terminology | |
Structure
editThe zona orbicularis forms a ring around the neck of the femur.[2]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 theiliofemoral ligament,and gain an attachment to theanterior inferior iliac spine.[3]
Function
editThe 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.[4][5]It tightens the joint capsule of thehipwheniliopsoas musclecontracts.[2]
Additional images
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Front view of hip joint with capsular ligament largely removed
Zona orbicularis used as arthroscopic landmark for iliopsoas muscle.
Notes
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This article incorporates text in thepublic domainfrompage 334of the 20th edition ofGray's Anatomy(1918)
- ^"Zona orbicularis".Irish Health. March 2000.Retrieved21 June2009.
- ^abMagerkurth, Olaf; Jacobson, Jon A.; Morag, Yoav; Caoili, Elaine; Fessell, David; Sekiya, Jon K. (October 2013)."Capsular Laxity of the Hip: Findings at Magnetic Resonance Arthrography".Arthroscopy: The Journal of Arthroscopic & Related Surgery.29(10): 1615–1622.doi:10.1016/j.arthro.2013.07.261.ISSN0749-8063.PMID23993056.
- ^Gray's Anatomy(1918), 7a3
- ^Ito H.et al(2009)
- ^Bedi, Asheesh; Galano, Gregory; Walsh, Christopher; Kelly, Bryan T. (December 2011)."Capsular Management During Hip Arthroscopy: From Femoroacetabular Impingement to Instability".Arthroscopy: The Journal of Arthroscopic & Related Surgery.27(12): 1720–1731.doi:10.1016/j.arthro.2011.08.288.ISSN0749-8063.PMID22047925.
References
edit- Gray, Henry (1918). "7. Articulations of the Lower Extremity. a. Coxal Articulation or Hip-joint".Anatomy of the Human Body.Bartleby.
- Ito H, Song Y, Lindsey DP, Safran MR, Giori NJ (January 2009)."The proximal hip joint capsule and the zona orbicularis contribute to hip joint stability in distraction".J. Orthop. Res.27(8). Department of Orthopaedic Surgery, Asahikawa Medical College: 989–95.doi:10.1002/jor.20852.PMID19148941.S2CID25524483.(Abstract)
