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Double-layered lateral meniscus: a newly found anomaly.

S Suzuki1, F Mita, H Ogishima

  • 1Department of Orthopaedic Surgery, Jichi Medical School, Tochigi-ken, Japan.

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
|January 1, 1991
PubMed
Summary

This study details two cases of a double lateral meniscus, a rare condition where an extra meniscus overlays the primary one. Surgical removal of the accessory meniscus successfully resolved symptoms in both patients.

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Area of Science:

  • Orthopedics
  • Knee Anatomy
  • Surgical Pathology

Background:

  • The lateral meniscus is crucial for knee joint stability and shock absorption.
  • Anatomical variations of the meniscus can lead to symptomatic knee pain.
  • Double lateral meniscus is an exceptionally rare congenital anomaly.

Observation:

  • Two patients presented with symptoms attributed to a double lateral meniscus.
  • A characteristic finding was the upper accessory meniscus connected to the posterior horn and middle segments of the lower meniscus.
  • No meniscal tears or fiber arrangement disturbances were noted in the observed menisci.

Findings:

  • Arthroscopic resection of the supernumerary (upper) lateral meniscus led to complete symptom resolution in both cases.

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  • The resected accessory meniscus exhibited normal histological and structural characteristics.
  • The condition appears to be a structural anomaly rather than a degenerative or traumatic pathology.

    • Implications:

    • This report highlights a rare meniscal anomaly and its successful arthroscopic management.
    • It suggests that symptomatic double lateral meniscus can be effectively treated by removing the accessory component.
    • Further research may elucidate the embryological origin and long-term outcomes of this condition.