title: The effect of tibial rotation on the presence of instability in the anterior cruciate ligament deficient knee.
abstract: BACKGROUND
  The effects of tibial rotation after ACL injury have not yet been well determined.
  
  
  OBJECTIVE
  To show whether clinical outcomes such as the amount of tibial rotation can affect functional outcomes in normal and ACL deficient knees.
  
  
  METHODS
  Case control study.
  
  
  METHODS
  Research laboratory.
  
  
  METHODS
  Twenty normal subjects (Control) and 20 subjects with ACL deficient knees (ACL).
  
  
  METHODS
  Tibial rotation at 30 and 90 degrees of knee flexion was measured using an inclinometer. One-legged hop, crossover hop, figure-of-eight running and 10-m running tests were used and determined the effect(s) of tibial rotation on the outcome of the functional tests.
  
  
  RESULTS
  There were significant between-group differences in internal and external rotation. The relationship between external tibial rotation and the figure-of-eight index was significantly negatively correlated.
  
  
  CONCLUSIONS
  The amount of tibial rotation is greater in ACL ruptured knees than in uninjured knees, and these greater amounts of tibial rotation affected the figure-of-eight running index.
authors: Department of Physical Therapy, Faculty of Health Sciences at Hokkaido University School of Medicine, Japan. mina@cme.hokudai.ac.jp
authors: Mina
authors: M
authors: Samukawa
authors: David
authors: D
authors: Magee
authors: Masaki
authors: M
authors: Katayose
mesh_terms: D000293:Adolescent; D000070598:Anterior Cruciate Ligament Injuries; D016022:Case-Control Studies; D005080:Exercise Test; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D012399:Rotation; D013977:Tibia / Q000503:physiopathology*