title: [Effects of posterior tibial slope on non-contact anterior cruciate ligament rupture and stability of anterior cruciate ligament rupture knee].
abstract: OBJECTIVE
  To retrospectively explore the correlation between anterior cruciate ligament (ACL)-ruptured knees, stability of ACL-rupture knee and posterior tibial slope (PTS).
  
  
  METHODS
  From January 2008 to October 2012, 150 knees with ACL rupture underwent arthroscopic surgery for ACL reconstruction. A control group was established for subjects undergoing arthroscopic surgery without ACL rupture during the same period. PTS was measured on a digitalized lateral radiograph. Lachman and mechanized pivot shift tests were performed for assessing the stability of knee.
  
  
  RESULTS
  There was significant difference (P = 0.007) in PTS angle between the patients with ACL rupture (9.5 ± 2.2 degrees) and the control group (6.6 ± 1.8 degrees). Only among females, increased slope of tibial plateau had effect on the Lachman test. There was a higher positive rate of pivot shift test in patients of increased posterior slope in the ACL rupture group.
  
  
  CONCLUSIONS
  Increased posterior tibial slope (>6.6) appears to contribute to non-contact ACL injuries in females. And the changes of tibial slope have no effect upon the Lachman test. However, large changes in tibial slope affect pivot shift.
authors.affiliation: Department of Joint Surgery, China-Japan Friendship Hospital, Beijing 100029, China.
authors.forename: De-bo
authors.initials: DB
authors.lastname: Yue
authors.forename: Sen
authors.initials: S
authors.lastname: E
authors.forename: Bai-liang
authors.initials: BL
authors.lastname: Wang
authors.forename: Wei-guo
authors.initials: WG
authors.lastname: Wang
authors.forename: Wan-shou
authors.initials: WS
authors.lastname: Guo
authors.forename: Qi-dong
authors.initials: QD
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000070598:Anterior Cruciate Ligament Injuries; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology*; D007718:Knee Injuries / Q000209:etiology*; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013977:Tibia / Q000002:abnormalities*; D055815:Young Adult