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[Semidiscoid lateral meniscus].

Y Araki1, T Ishida, M Ootani

  • 1Department of Radiology, Osaka Rosai Hospital.

Nihon Igaku Hoshasen Gakkai Zasshi. Nippon Acta Radiologica
|December 25, 1992
PubMed
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Researchers identified a new knee condition, the semidiscoid lateral meniscus. Diagnostic criteria involve specific measurements on 3D MRI, distinguishing it from other meniscal variations.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Anatomy

Background:

  • The lateral meniscus is crucial for knee joint stability.
  • Variations in meniscal morphology, such as discoid menisci, are known but incompletely understood.
  • A distinct entity, the semidiscoid lateral meniscus, is proposed.

Purpose of the Study:

  • To define the diagnostic criteria for the semidiscoid lateral meniscus.
  • To investigate the prevalence and characteristics of this proposed entity.

Main Methods:

  • Utilized thin-sliced axial 3D MRI for imaging.
  • Defined diagnostic criteria based on coronal image transverse width (11.6–14.3 mm) calculated via discriminant analysis.
  • Retrospectively reviewed MR examinations of 15 patients diagnosed with semidiscoid lateral meniscus.

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Main Results:

  • Fifteen patients (15 knees) were identified with the semidiscoid lateral meniscus.
  • Complicated lateral meniscal tears occurred in 3 cases; 9 knees were uncomplicated, and 5 were asymptomatic.
  • Contralateral MRIs in 6 patients revealed discoid lateral menisci in all cases, suggesting a relationship.

Conclusions:

  • The semidiscoid lateral meniscus is a newly proposed entity of the knee.
  • Its diagnostic criteria are established using specific MRI measurements.
  • A significant association between semidiscoid lateral meniscus and discoid lateral meniscus is observed.