MR Imaging of the Hip (Part I): Normal Labrum, Labral Tears, and Femoroacetabular Impingement

  • Christine B. Chung


The acetabular labrum, similar to the labrum in the glenoid, is made up of fibrocartilaginous tissue and attaches to the margin of the acetabular rim, deepening the acetabular socket. Histologically, three separate layers are identified within the labrum: a randomly oriented fibrocartilaginous layer at the articular surface, a central lamellar layer of collagen, and a circumferentially oriented layer along the capsular surface. The composition of the labrum allows it to dissipate load stresses across the hip joint, but makes the basal layer vulnerable to shear forces. The labrum is a relatively avascular structure, resulting in a limited ability to repair itself [1]. It aids in the distribution of weight-bearing forces through the joint by maintaining a joint-fluid layer between the articular cartilage of the femur and femoral head, and by preventing lateral translation of the femur [2].


Femoral Head Magnetic Resonance Arthrography Labral Tear Femoroacetabular Impingement Labral Pathology 
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© Springer-Verlag Italia 2009

Authors and Affiliations

  • Christine B. Chung
    • 1
  1. 1.Department of RadiologyUniversity of CaliforniaSan DiegoUSA

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