The flipped meniscus sign

Nogah Haramati, Ronald B. Staron, Stuart Rubin, Elise H. Shreck, Frieda Feldman, Howard jKiernan

Research output: Contribution to journalArticlepeer-review

64 Scopus citations


Meniscal fragments may be difficult to detect on magnetic resonance (MR) imaging and yet are clinically significant. This paper describes and illustrates the MR appearance of an easily overlooked meniscal fragment. Ten knees, each appearing to show an abnormally large anterior meniscal horn (8 mm or more in height) were prospectively identified on MR images. In each case demonstrable large tears of the ipsilateral posterior horns were present (same meniscus as had large anterior horns). The lateral meniscus was involved in nine cases and the medial in one. Two of the ten patients imaged had surgically proven bucket-handle meniscal tears as well as meniscal fragments overlying the ipsilateral anterior horn. In one case previous MR imaging at our institution had demonstrated the affected anterior horn to be of normal caliber. The striking MR appearance of an abnormally enlarged anterior meniscal horn in association with a tear of the ipsilateral posterior horn suggests the presence of a meniscal fragment or of a posteriorly detached bucket-handle tear of the posterior horn of the meniscus.

Original languageEnglish (US)
Pages (from-to)273-277
Number of pages5
JournalSkeletal Radiology
Issue number4
StatePublished - May 1 1993
Externally publishedYes


  • Knee
  • Knee arthroscopy
  • Knee locking
  • Meniscal fragment
  • Meniscal tear
  • Meniscus

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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