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Double-Layered Lateral Meniscus Including a Ring-Shaped Accessory Meniscus

A Case Report

Ahn, Tae Young, MD1; Kim, Hui Taek, MD, PhD1; Park, Yong Geon, MD1

doi: 10.2106/JBJS.CC.18.00042
Case Reports

Case: We report the rare case of a double-layered lateral meniscus that was comprised of a normal meniscus and a ring-shaped accessory meniscus. An 11-year-old boy presented with left knee pain, and magnetic resonance imaging initially was interpreted as showing a horizontal meniscal tear. However, arthroscopic exploration revealed a double-layered meniscus. A superior accessory meniscus was fused with the inferior normal meniscus at the posterior horn and had more mobility compared with the normal meniscus. The symptoms improved substantially after resection of the superior accessory meniscus. The patient returned to sports at 4 months postoperatively; at 15 months postoperatively, radiographs demonstrated no evidence of degenerative changes.

Conclusion: A double-layered lateral meniscus that includes a ring-shaped accessory meniscus is a rare abnormality that can be corrected arthroscopically by resection of the accessory meniscus.

1Division of Pediatric Orthopaedics, Department of Orthopaedic Surgery, Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea

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Copyright © 2018 by The Journal of Bone and Joint Surgery, Incorporated
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