title: Effect of posterior cruciate ligament rupture on the radial displacement of lateral meniscus.
abstract: BACKGROUND
  The relationship between lateral meniscus tear and posterior cruciate ligament injury is not well understood. The present study aims to investigate and assess the effect of posterior cruciate ligament rupture on lateral meniscus radial displacement at different flexion angles under static loading conditions.
  
  
  METHODS
  Twelve fresh human cadaveric knee specimens were divided into four groups such as posterior cruciate ligament intact, anterolateral band rupture, posteromedial band rupture and posterior cruciate ligament complete rupture groups, according to the purpose and order of testing. Radial displacement of lateral meniscus was measured under different loads (200-1000N) at 0°, 30°, 60°, and 90° of knee flexion.
  
  
  RESULTS
  Compared with posterior cruciate ligament intact group, the displacement values of lateral meniscus in anterolateral band rupture group increased at 0° flexion with 600N, 800N, and 1000N and at 30°, 60° and 90° flexion under all loading conditions. Posteromedial band rupture group exhibited higher displacement at 0° flexion under all loading conditions, at 30° and 60° flexion with 600, 800N and 1000N, and at 90° flexion with 400N, 600N, 800N, and 1000N than the posterior cruciate ligament intact group. The posterior cruciate ligament complete rupture group had a higher displacement value of lateral medial meniscus at 0°, 30°, 60° and 90° flexion under all loading conditions, as compared to the posterior cruciate ligament intact group.
  
  
  CONCLUSIONS
  The study concludes that partial and complete rupture of the posterior cruciate ligament can trigger the increase of radial displacement on lateral meniscus.
authors.affiliation: Department of Orthopedics, Xiangya Hospital, Central South University, PR China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Lei
authors.affiliation: Department of Orthopedics, The Sixth Affiliated Hospital of Xinjiang Medical University, PR China.
authors.forename: Rongxin
authors.initials: R
authors.lastname: Sun
authors.affiliation: Department of Orthopedics, Xiangya Hospital, Central South University, PR China.
authors.forename: Yihe
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Department of Orthopedics, Xiangya Hospital, Central South University, PR China.
authors.forename: Kanghua
authors.initials: K
authors.lastname: Li
authors.affiliation: Department of Orthopedics, Xiangya Hospital, Central South University, PR China. Electronic address: liaozhan88@yeah.net.
authors.forename: Zhan
authors.initials: Z
authors.lastname: Liao
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D002102:Cadaver; D006801:Humans; D007718:Knee Injuries / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D008592:Menisci, Tibial / Q000473:pathology / Q000503:physiopathology*; D016119:Posterior Cruciate Ligament / Q000293:injuries* / Q000473:pathology / Q000503:physiopathology; D016059:Range of Motion, Articular; D012421:Rupture
keywords: Lateral meniscus; Posterior cruciate ligament; Radial displacement; Rupture