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Joseph Junewick, MD FACR
over 11 years ago
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Limbus Labrum

Case Detail

Anatomy: Musculoskeletal
Joseph Junewick, MD FACR
Diagnostic Category: Developmental or Congenital
Created: over 10 years ago
Updated: over 10 years ago
Tags: PEDS
Modality/Study Types: US MR
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3 month old with unstable hips on physical examination.

Case Images


Limbus Labrum


US – The left femoral head is laterally decentered. The labrum is enlarged.

MR – Coronal T1 and T2 images of the pelvis after attempted closed reduction confirms the presence of a limbus labrum which has folded back on itself, preventing seating of the left femoral head in the native acetabulum.


The lateral edge of hyaline cartilage of the acetabulum is extended by a fibrocartilaginous structure known as the labrum or limbus. The term “limbus” however has become associated with a pathologic process where the labrum becomes enlarged and deformed and the capsule becomes adherent in the process of hip dislocation. The limbus may in turn impede reduction if it becomes interposed between the acetabulum and the femoral head.


Ozonoff MB. Pediatric Orthopedic Radiology, 2nd Ed. WB Saunders and Co (1992).

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