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The knee after partial meniscectomy: MR imaging features.

D K Smith1, W G Totty

  • 1Mallinckrodt Institute of Radiology, St Louis, MO 63110.

Radiology
|July 1, 1990
PubMed
Summary
This summary is machine-generated.

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Magnetic resonance (MR) imaging after partial meniscectomy shows a spectrum of appearances. Standard MR criteria can diagnose tears, but contour irregularity requires cautious interpretation to avoid misdiagnosis.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Medical Imaging

Background:

  • Partial meniscectomy is a common orthopedic procedure.
  • Assessing meniscal integrity post-surgery using magnetic resonance (MR) imaging is crucial.
  • Post-surgical changes can alter meniscal appearance on MR, potentially complicating tear detection.

Purpose of the Study:

  • To review magnetic resonance (MR) findings in menisci after partial meniscectomy.
  • To evaluate the spectrum of normal MR appearances in post-meniscectomy menisci.
  • To assess the reliability of standard MR criteria for diagnosing meniscal tears in this context.

Main Methods:

  • Retrospective review of MR examinations in 51 menisci post-partial meniscectomy.
  • Classification of menisci into three groups based on length and presence of osteoarthritis.

Related Experiment Videos

  • Arthroscopic correlation was performed for a subset of menisci.

    • Main Results:

    • Group 1 menisci showed mild shortening and frequent signal inhomogeneity.
    • Group 2 menisci exhibited marked contour irregularity, simulating fragmentation in 40% of segments.
    • Arthroscopic correlation confirmed MR diagnosis in some cases but also revealed unsuspected tears; contour irregularity mimicked tears but was not predictive.

    Conclusions:

    • A spectrum of normal MR appearances exists after partial meniscectomy.
    • Standard MR criteria are useful for diagnosing tears when marked contour irregularity is absent.
    • Diagnosis of tears in segments with marked contour irregularity should be approached cautiously due to potential for mimicking tears.