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Peer-reviewedCC BY-NCJournal of orthopaedic case reports

Double-Layered Lateral Meniscus Mimicking Locking of Lateral Meniscus: A Case Report.

  • Takashi Katsuo1,2
  • Yasushi Takata1
  • Naoki Takemoto1
  • Manase Nishimura1
  • Satoru Demura1
  • Junsuke Nakase1
  1. 1Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan.
  2. 2Kaga Medical Center, Kaga, Japan.
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Abstract

Double-layered lateral meniscus is an extremely rare anomaly, often presenting with symptoms similar to those of meniscal tears or locking. Characteristic magnetic resonance imaging (MRI) findings are not well established, and definitive diagnosis typically requires arthroscopy. A 47-year-old male presented with left knee pain following martial arts training. Locking of the lateral meniscus was suspected by MRI; however, arthroscopy revealed a double-layered lateral meniscus. The accessory meniscus was resected and post-operative outcomes were uneventful. MRI may serve as an adjunctive tool in the diagnosis of a double-layered lateral meniscus. Resection of the accessory meniscal layer can lead to favorable clinical outcomes.

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Cite

BibTeXRIS
BibTeX
@article{katsuo2026doublelayered,
  title = {{Double-Layered Lateral Meniscus Mimicking Locking of Lateral Meniscus: A Case Report.}},
  author = {Takashi Katsuo and Yasushi Takata and Naoki Takemoto and Manase Nishimura and Satoru Demura and Junsuke Nakase},
  journal = {Journal of orthopaedic case reports},
  year = {2026},
  month = nov,
  doi = {10.13107/jocr.2026.v16.i11.8412},
  url = {https://europepmc.org/article/MED/42997040},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Double-Layered Lateral Meniscus Mimicking Locking of Lateral Meniscus: A Case Report.
AU  - Takashi Katsuo
AU  - Yasushi Takata
AU  - Naoki Takemoto
AU  - Manase Nishimura
AU  - Satoru Demura
AU  - Junsuke Nakase
PY  - 2026
DA  - 2026/11/01
JO  - Journal of orthopaedic case reports
DO  - 10.13107/jocr.2026.v16.i11.8412
UR  - https://europepmc.org/article/MED/42997040
AB  - Double-layered lateral meniscus is an extremely rare anomaly, often presenting with symptoms similar to those of meniscal tears or locking. Characteristic magnetic resonance imaging (MRI) findings are not well established, and definitive diagnosis typically requires arthroscopy. A 47-year-old male presented with left knee pain following martial arts training. Locking of the lateral meniscus was suspected by MRI; however, arthroscopy revealed a double-layered lateral meniscus. The accessory meniscus was resected and post-operative outcomes were uneventful. MRI may serve as an adjunctive tool in the diagnosis of a double-layered lateral meniscus. Resection of the accessory meniscal layer can lead to favorable clinical outcomes.
SN  - 2250-0685
SN  - 2321-3817
ER  -