Ipsilateral Medial and Lateral Discoid Meniscus with Medial Meniscus Tear

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Kengo Shimozaki1, Junsuke Nakase1, Yoshinori Ohashi1

  • 1Department of Orthopaedic Surgery, Kanazawa University, 13-1 Takara-Machi, Kanazawa-Shi, Ishikawa-Ken 920-8641, Japan.

Journal of Orthopaedic Case Reports
|February 7, 2017
PubMed
Abstract

Insights

Concurrent medial and lateral discoid meniscus is a rare knee condition. This case highlights successful arthroscopic partial meniscectomy for a torn medial discoid meniscus, with observation of the asymptomatic lateral discoid meniscus.

Area of Science:

  • Orthopedic Surgery
  • Knee Anatomy
  • Diagnostic Imaging

Background:

  • Discoid meniscus is a congenital anomaly of the knee meniscus.
  • While isolated medial or lateral discoid menisci are documented, concurrent ipsilateral presentation is exceptionally rare.
  • This report details an extremely uncommon case of simultaneous medial and lateral discoid menisci.

Observation:

  • A 27-year-old male presented with right knee medial joint space pain.
  • Magnetic resonance imaging (MRI) and arthroscopic examination revealed a complete medial and lateral discoid meniscus.
  • The medial discoid meniscus exhibited a horizontal tear and anomalous anterior cruciate ligament insertion, while the lateral discoid meniscus was intact.

Findings:

  • Arthroscopic partial meniscectomy was performed on the symptomatic, torn medial discoid meniscus.
  • The asymptomatic lateral discoid meniscus was managed conservatively with observation.
  • At 18-month follow-up, the patient reported satisfactory outcomes after treatment for the medial meniscus tear.

Implications:

  • This case underscores the importance of thorough diagnostic evaluation for concurrent discoid menisci.
  • It suggests a tailored treatment approach, addressing symptomatic tears while monitoring asymptomatic anomalies.
  • Further research into the natural history and optimal management of combined medial and lateral discoid menisci is warranted.
Keywords:
Ipsilateral medial and lateral discoid meniscusarthroscopic partial meniscectomymedial meniscus tear

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