Hip Pelvis.  2015 Mar;27(1):49-52. 10.5371/hp.2015.27.1.49.

Unusual Cause of Hip Pain: Intrusion of the Acetabular Labrum

• Jang SA
• Cho YH
• Byun YS
• Jeong DG
• Han IH
• Kim MG

• KMID: 2156020
• DOI: http://doi.org/10.5371/hp.2015.27.1.49

Abstract

Femoroacetabular impingement and dysplatic hip joint is well known cause of osteoarthritis. In these diseases, labral tear and subsequent cartilage damage is thought to be main pathophysiology of development of osteoarthritis. If there are no known bony abnormalities, we called it as idiopathic osteoarthritis. Normal appearance of acetabular labrum is a continuous, usually triangular structure that attaches to the bony rim of the acetabulum and is completed at the inferior portion by the transverse acetabular ligament over the acetabular notch. A few authors reported intra-articular labrum and its relation to the development of osteoarthritis. But they didn't comment the primary bony abnormality especially acetabulum. We'd like to report x-ray, computed tomogram, magnetic resonance arthrogram and arthroscopic findings of a case had double contour sign of acetabular dome combined with intrusion of acetabular labrum.

Keyword

Acetabular labrum; Intrusion; Osteoarthritis; Idiopathic

MeSH Terms

Acetabulum*
Cartilage
Femoracetabular Impingement
Hip Joint
Hip*
Ligaments
Osteoarthritis

Figure

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  Fig. 1 Left hip anteroposterior view shows joint space discrepancy between the medial (dotted line) and lateral acetabular dome (solid line) like gull wing. It means there is two distinct contour at the acetabular dome.

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  Fig. 2 Definite double contour (dotted and solid line) at the acetabular dome can be seen at the coronal reconstruction computed tomogram scanning.

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  Fig. 3 Coronal reconstruction of magnetic resonance arthrogram shows intra-articular low signal intensity line indicating intrusion of acetabular labrum (arrowhead).

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  Fig. 4 (A) Arthroscopic picture viewing from anterolateral portal shows torn cartilage (arrow), acetabular labrum (L), acetabular cartilage (C), intrusion of acetabular labrum (I). (B) After shaving and cauterization of the torn cartilage, reduced acetabular cartilage width from the acetabular fossa is shown clearly.

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