title: Importance of the different posterolateral knee static stabilizers: biomechanical study.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the relative importance of the different static stabilizers of the posterolateral corner of the knee in cadavers.
  
  
  METHODS
  Tests were performed with the application of a varus and external rotation force to the knee in extension at 30 and 60 degrees of flexion using 10 cadaver knees. The forces were applied initially to an intact knee and then repeated after a selective sectioning of the ligaments into the following: section of the lateral collateral ligament; section of the lateral collateral ligament and the popliteofibular complex; and section of the lateral collateral ligament, the popliteofibular complex and the posterolateral capsule. The parameters studied were the angular deformity and stiffness when the knees were submitted to a 15 Newton-meter varus torque and a 6 Newton-meter external tibial torque. Statistical analysis was performed using the ANOVA (Analysis of Variance) and Tukey's tests.
  
  
  CONCLUSIONS
  Our findings showed that the lateral collateral ligament was important in varus stability at 0, 30 and 60 degrees. The popliteofibular complex was the most important structure for external rotation stability at all angles of flexion and was also important for varus stability at 30 and 60 degrees. The posterolateral capsule was important for varus stability at 0 and 30 degrees and for external rotation stability in extension.
  
  
  METHODS
  Level IV (cadaver study).
authors.affiliation: Faculdade de Ciências Médicas de Minas Gerais - Belo Horizonte/MG, Brazil.
authors.forename: Rodrigo Campos Pace
authors.initials: RC
authors.lastname: Lasmar
authors.forename: Adriano
authors.initials: A
authors.lastname: Marques de Almeida
authors.forename: José Wilson
authors.initials: JW
authors.lastname: Serbino
authors.forename: Roberto Freire da
authors.initials: RF
authors.lastname: Mota Albuquerque
authors.forename: Arnaldo José
authors.initials: AJ
authors.lastname: Hernandez
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D005260:Female; D005360:Fibula / Q000502:physiology; D006801:Humans; D007593:Joint Instability / Q000534:rehabilitation*; D007719:Knee Joint / Q000033:anatomy & histology / Q000502:physiology*; D008297:Male; D017888:Medial Collateral Ligament, Knee / Q000033:anatomy & histology / Q000502:physiology*; D008875:Middle Aged; D019637:Orthopedic Procedures / Q000379:methods; D013710:Tendons / Q000502:physiology; D019415:Torque; D016474:Weight-Bearing
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