title: Attachment area of fibres from the horns of lateral meniscus: anatomic study with special reference to the positional relationship of anterior cruciate ligament.
abstract: OBJECTIVE
  Although studies support the clinical importance of the fibres from the horns of lateral meniscus (LM), few studies have investigated the detailed anatomy. This anatomic study was conducted to analyse the structural details of LM with special reference to (1) the attachment area of the fibres from the anterior and posterior horns and (2) the positional relationship between these fibres and the anterior cruciate ligament (ACL).
  
  
  METHODS
  A total of 24 cadaveric knees were used in the macroscopic investigation, and six knees were used in the histological investigation. Micro-computed tomography analysis was also performed to assess the anatomy of the posteriormost fibre from the posterior horn of LM.
  
  
  RESULTS
  Based on the macroscopic investigations, the outer fibres from the anterior horn of LM extended to ACL and seemed to intermingle with ACL fibres. However, the histological investigations showed a distinct border between the fibres and ACL. The inner fibres from the anterior horn of LM attached to the lateral intercondylar tubercle serving as a lateral margin of ACL attachment. Fibres from the posterior horn of LM were separated into anterolateral and posteromedial crura which attached to the posterior aspect of the lateral and medial intercondylar tubercles, respectively. These two crura formed the posterior margin of the ACL attachment, except for the central part of ACL.
  
  
  CONCLUSIONS
  The outer fibres from the anterior horn of LM adjoined ACL. The inner fibres from the anterior horn of LM and two crura from the posterior horn of LM formed the border of the attachment area of ACL. The distinctive fibre anatomy from LM could provide a surgical landmark during arthroscopic surgery.
authors.affiliation: Department of Clinical Anatomy, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
authors.forename: Hitomi
authors.initials: H
authors.lastname: Fujishiro
authors.affiliation: Department of Clinical Anatomy, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
authors.forename: Sachiyuki
authors.initials: S
authors.lastname: Tsukada
authors.affiliation: Department of Orthopaedic Surgery, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
authors.forename: Tomomasa
authors.initials: T
authors.lastname: Nakamura
authors.affiliation: Department of Clinical Anatomy, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.|Department of Orthopaedic Surgery, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
authors.forename: Akimoto
authors.initials: A
authors.lastname: Nimura
authors.affiliation: Department of Clinical Anatomy, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.|Department of Orthopaedic Surgery, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Mochizuki
authors.affiliation: Department of Clinical Anatomy, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan. akita.fana@tmd.ac.jp.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Akita
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016118:Anterior Cruciate Ligament / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D002102:Cadaver; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008297:Male; D008592:Menisci, Tibial / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008875:Middle Aged; D055114:X-Ray Microtomography
keywords: Anatomy; Anterior cruciate ligament; Knee; Meniscus