Acetabular Labrum

The labrum can be visualized at the anterior attachment onto the acetabulum with sonography. The anterior labrum appears as a triangular hyperechoic focus at the ventral margin of the acetabulum. An irregular hypoechoic cleft at the base of the labrum is highly suggestive of an anterior labral tear [24] ; however, MR arthrography remains the primary imaging modality of choice for evaluation of the acetabular labrum. MR arthrography has a reported sensitivity and accuracy for detection of labral tears and detachments of 90% and 91% respectively [25]. Unlike the limited labral visualization with sonography, MR arthrography provides a thorough evaluation of the entire labrum and surrounding bony and soft-tissue structures.

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