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Case 89

Meniscal ossicle

Findings

The plain film shows a round corticated mass close to the posterior joint line.

MRI images (T1 sagittal, T2 sagittal, T1 coronal) show a well defined ossicle containing high signal marrow fat, lying in the posterior horn of the medial meniscus.

Plain films of knee (above)

MRI of knee (below): T1 and T2 sagittal and T1 coronal images

Diagnosis

Meniscal ossicle

Discussion

Meniscal ossicles are a rare incidental finding. Usually found in the posterior horn of the medial meniscus, their aetiology is uncertain. A congenital origin with the ossicle being formed from rests of primitive mesenchyme cells is preferred, but recent evidence supports a traumatic aetiology.

References

Mink et al. MRI of the knee. 2nd Ed. p133.14
Berg EE. The meniscal ossicle: The consequences of a meniscal avulsion. Arthroscopy 1991;7(2):241-243

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