The inverted discoid meniscus segment: Clinical, radiographic, and arthroscopic description of a hidden tear pattern

Lauren LaMont, Henry Ellis, Kelsey Wise, Philip Wilson

Research output: Contribution to journalArticle

3 Scopus citations


Background: A flipped, or inverted, meniscus segment is easily visualized in the normal meniscus. However, an inverted discoid meniscus segment may be difficult to appreciate because the tear occurs more centrally and leaves more meniscal rim; thus, it may be undertreated if not addressed during arthroscopy. Purpose: To describe findings on clinical history, radiographs, MRI, and arthroscopy of a lateral discoid meniscus with an inverted segment and compare them with characteristics of a lateral discoid meniscus without an inverted segment. Study Design: Case-control study; Level of evidence, 3. Methods: Between 2009 and 2012, a retrospective series of 121 consecutive knee arthroscopies for symptomatic lateral discoid meniscus were reviewed for the presence of an inverted fragment. Chart review of clinical presentation, operative reports, radiographic images, and arthroscopic images was performed. Comparative analysis of the clinical presentation between lateral discoid menisci with an inverted segment and noninverted lateral discoid menisci was performed by use of Fisher exact test and Mann-Whitney test. Results: Nineteen patients with an inverted discoid meniscus segment (14 males, 5 females; average age, 15.0 years; range, 9.5-17.0 years) were compared with 102 patients with a noninverted discoid meniscus (53 males, 49 females; average age, 12.3 years; range, 5-17.0 years) (P =.011 for sex and P

Original languageEnglish (US)
Pages (from-to)1534-1539
Number of pages6
JournalAmerican Journal of Sports Medicine
Issue number6
Publication statusPublished - Jun 1 2016



  • adolescent
  • discoid
  • meniscus
  • pediatric arthroscopy

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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