Meniscal Ossicle
Description
Name
- Meniscal Ossicle
History
- First described in the medial literature in the 1930s[3]
General
- Accessory ossicle located within the meniscus
- Uncommon and often incidental finding on imaging
Epidemiology
- Reported to have a prevalance of 0.15% in the general population[4]
Pathology
- Not well established
- May be congenital, post-traumatic and/or degenerative
- Association with medial meniscus tear suggests traumatic etiology
- Cancellous bone with cartilage interface
- Mucoid degeneration of the meniscus and interval minieralization have been proposed
- Favored theory is post-traumatic with heterotopic ossification of the meniscus[5]
Radiographic Findings
- Most often in the posterior horn of of the medial meniscus
- Margins are smooth
MRI
- Follows bone marrow on all sequences
- Hyperintense on T1, hypointense on T2
Clinical Significance
- Often an incidental finding
- May present with intermittent pain
- Joint locking is less common than intra-articular loose bodies
Associated Conditions Meniscus Tear
Clinical Significance
- Needs to be updated
See Also
References
- ↑ Case courtesy of Paresh K Desai, Radiopaedia.org, rID: 13139
- ↑ Image courtesy of https://www.eurorad.org/case/16545
- ↑ Harris, H. A. "Calcification and ossification in the semilunar cartilages." The Lancet 223.5778 (1934): 1114-1116.
- ↑ Schnarkowski, Peter, et al. "Meniscal ossicle: radiographic and MR imaging findings." Radiology 196.1 (1995): 47-50.
- ↑ Yoo, Jae Ho, Bo Kyu Yang, and Bo Kyeong Son. "Meniscal ossicle: a case report." The Knee 14.6 (2007): 493-496.