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Related Experiment Videos

Posterior tibial tendon dysfunction: secondary MR signs

P S Lim1, M E Schweitzer, D M Deely

  • 1Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania 19107, USA.

Foot & Ankle International
|November 5, 1997
PubMed
Summary

This study identifies key secondary magnetic resonance imaging signs for diagnosing posterior tibial tendon (PTT) tears. Unroofing of the talus and tibial spurring show high specificity for PTT tears.

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Area of Science:

  • Orthopedics
  • Radiology
  • Musculoskeletal Imaging

Background:

  • Posterior tibial tendon (PTT) tears are a common cause of medial ankle pain.
  • Accurate diagnosis of PTT tears is crucial for effective treatment.
  • Magnetic resonance imaging (MRI) is a primary modality for evaluating PTT pathology.

Purpose of the Study:

  • To evaluate the diagnostic utility of four secondary MRI signs for posterior tibial tendon tears.
  • To assess the specificity and sensitivity of these secondary signs.
  • To determine inter-radiologist agreement on the interpretation of these signs.

Main Methods:

  • Retrospective review of 71 ankle MRIs (25 PTT tears, 46 controls).
  • Evaluation of four secondary signs: PTT sheath fluid, distal tibial spur, unroofing of the talus, and bone bruise-like lesions.

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  • Confidence scoring and inter-reader agreement analysis by two musculoskeletal radiologists.

    • Main Results:

    • PTT sheath fluid demonstrated modest specificity and fair-to-moderate sensitivity.
    • Tibial spurring and unroofing of the talus exhibited excellent specificity and fair sensitivity.
    • Bone bruise-like lesions were frequently observed in both PTT tear and control groups, indicating lower diagnostic value.

    Conclusions:

    • Unroofing of the talus, tibial spurring, and PTT sheath fluid are valuable secondary MRI signs with high specificity for diagnosing PTT tears.
    • Interpretation challenges exist for PTT sheath fluid and bone bruise-like lesions, necessitating careful evaluation.
    • These findings can aid radiologists in improving the accuracy of PTT tear diagnosis on MRI.