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Impingement
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Femoroacetabular Impingement


The MRI report should include:

  • Presence or absence of cam lesion
  • Status of labrum
  • Presence of cartilafe lesions
  • Don’t forget the posterior joint space
  • Five


The classic labral injury of cam impingement occurs in the antosuperior labrum. A cleft begins to separate the labrum from its acetabular attachment. The cleft deepens to a tear and a paralabral cyst may form. It has been suggested that a different pattern of labral injury occurs with rim/pincer impingement. This pattern has been refeerd to as a “type II tear. The pattern comprises intrasubstance delamination and cystic degeneration, and tears also involving the anterosuperior portion of the labrum. Surgical option include osteochondroplasty, labral excision or repair.
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Paralabral cyst
Deep labral cleft
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