Meniscal ossicle

Meniscal ossicles are uncommon, often incidental, findings on radiography and cross-sectional imaging of the knee.

Reported to have a prevalence of 0.15% in the general population 2.

  • may be an incidental finding
  • may present with intermittent pain
  • joint locking is atypical, compared with intra-articular loose bodies

The aetiology of a meniscal ossicle has not been definitively established, and congenital, traumatic, and degenerative origins have been suggested. Its association with the posterior horn of the medial meniscus may favour a traumatic origin 1.

It consists of cancellous bone with a cartilage interface. There is no fibroblast proliferation or neovascularization 3

  • more often in the posterior horn of the medial meniscus
  • should have smooth margins, as opposed to a fracture fragment, and no donor site from the femur or tibia

The ossicle should follow bone marrow signal on all sequences:

  • T1: hyperintense
  • T2FS/STIR: hypointense

If symptomatic, conservative noninterventional therapy is tried first. If this fails, arthroscopic resection can be considered. Interventional therapy may also be considered if the ossicle is associated with other meniscal pathology.

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Article information

rID: 34455
Synonyms or Alternate Spellings:
  • Meniscal ossicles
  • Ossicles in the meniscus

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