title: Bilateral occurrence and morphologic analysis of complete discoid lateral meniscus.
abstract: OBJECTIVE
  The aim of the study was to investigate and analyze bilateral incidence and morphology of complete discoid lateral meniscus (DLM) with possible relation to tears and symptoms in knee joints.
  
  
  METHODS
  Thirty-eight consecutive patients with symptomatic or already-torn complete DLM on magnetic resonance imaging in a unilateral knee underwent diagnostic arthroscopy on both knee joints upon agreement. The presence and shape of complete DLM as well as presence and pattern of tear were recorded accordingly.
  
  
  RESULTS
  In total, 89.5% (34 of 38 patients) showed bilateral complete DLM, and 84.2% yielded bilateralism with identical shape. Cape-slab was the most frequent shape, comprising 68.8% of patients with identically-shaped bilateral DLM overall. Tear patterns were more frequent, in the order of longitudinal, simple horizontal, radial, and degenerative; however, the morphological shape of complete DLM was not significantly related to tear incidence or pattern. Meniscus tears and knee symptoms occurred in the contralateral knee with incidences of 32.4% and 26.5% in patients with bilateral complete DLM, respectively.
  
  
  CONCLUSIONS
  Based on these findings, more aggressive warning on the presence of discoid pathology and the need for evaluation on the contralateral knee should be considered during consultation with patients with symptomatic complete DLM in a unilateral knee in the outpatient clinic.
authors.affiliation: Department of Orthopedic Surgery, Ajou University School of Medicine, Suwon, Korea.
authors.forename: Jun Young
authors.initials: JY
authors.lastname: Chung
authors.affiliation: Department of Orthopedic Surgery, Sung Min Hospital, Incheon, Korea.
authors.forename: Jeong-Ho
authors.initials: JH
authors.lastname: Roh
authors.affiliation: Department of Orthopedic Surgery, Ajou University School of Medicine, Suwon, Korea.
authors.forename: Joon Ho
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Orthopedic Surgery, Ajou University School of Medicine, Suwon, Korea.
authors.forename: Jay Joong
authors.initials: JJ
authors.lastname: Kim
authors.affiliation: Department of Orthopedic Surgery, Ajou University School of Medicine, Suwon, Korea.; Department of Molecular Science and Technology, Ajou University, Suwon, Korea. dr.bhmin@gmail.com.
authors.forename: Byoung-Hyun
authors.initials: BH
authors.lastname: Min
mesh_terms: D000293:Adolescent; D000328:Adult; D001182:Arthroscopy / Q000379:methods*; D005260:Female; D006801:Humans; D015994:Incidence; D007719:Knee Joint / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008592:Menisci, Tibial / Q000601:surgery; D008875:Middle Aged; D009139:Musculoskeletal Abnormalities / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology / Q000601:surgery*; D012189:Retrospective Studies; D000070600:Tibial Meniscus Injuries; D055815:Young Adult
keywords: Knee; bilaterality; discoid; lateral meniscus; morphology
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