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AnatomyLower limbHip and thighAcetabular labrum
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AnatomyLower limbHip and thighAcetabular labrum

Acetabular labrum

Author: Edwin Ocran, MBChB, MSc • Reviewer: Dimitrios Mytilinaios, MD, PhD
Last reviewed: March 12, 2024
Reading time: 2 minutes

Recommended video: Hip joint [06:59]
Bones, ligaments, movements, blood supply and innervation of the hip joint.
Acetabular labrum
Labrum acetabuli
Synonyms: Glenoid labrum of hip, Labrum glenoidale coxae

The acetabular labrum is a fibrocartilaginous collar that surrounds the margin of the acetabulum and the outer edge of the transverse acetabular ligament that bridges the acetabular notch. It is derived from the Latin word 'labrum,' meaning 'lip'.

This structure raises the rim of the acetabulum slightly, deepening the socket of the acetabulum and increasing the articular surface area of the acetabulum by about 10%.

Due to the elevated rim and labrum, over half of the femoral head fits within the acetabulum. Thus, the acetabular labrum contributes to the stability of the hip joint by increasing the contact area between the acetabulum and the femoral head. Additionally, the acetabular labrum seals the hip joint and helps maintain optimal distribution of synovial fluid within the joint cavity.

Terminology
 English: Acetabular labrum
Synonym: Glenoid labrum of hip

Latin: Labrum acetabuli
Synonym: Labrum glenoidale coxae
Definition Fibrocartilaginous rim attached to the acetabular margin
Function Deepens the acetabulum
Contributes to the stability of the hip joint articulation
Seals the hip joint and maintains synovial fluid within the joint cavity

Learn more about the acetabular labrum in the following study unit:

Hip joint Explore study unit

Sources

All content published on Kenhub is reviewed by medical and anatomy experts. The information we provide is grounded on academic literature and peer-reviewed research. Kenhub does not provide medical advice. You can learn more about our content creation and review standards by reading our content quality guidelines.
  • Drake, R., Vogl, W., Mitchell, A. & Gray, H. (2015). Gray's anatomy for students. Philadelphia, PA: Churchill Livingstone/Elsevier.
  • McKinley, M. & Loughlin, V. (2012). Human anatomy. New York: McGraw-Hill.
    Mescher, A. L., & Junqueira, L. C. (2013).
  • Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
  • Standring, S. (2016). Gray's Anatomy (41st ed.). Edinburgh: Elsevier Churchill Livingstone

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