title: Comparative study of anatomical landmark technique and self-aligned tibial component rotation determined by computer-assisted TKA.
abstract: BACKGROUND
  An improper femoral and tibial component rotation is one of a major reason leading to a failed TKA. There is controversial on determination of rotational alignment particularly on a tibial component. An anatomical landmarks and a self-aligned technique have been proposed. It is the authors' purpose to determine the difference between two techniques in setting the rotation of tibial component.
  
  
  METHODS
  The authors conducted a prospective, comparative study of 30 consecutive primary total knee arthroplasty. There were 4 men and 26 women with mean age of 68.6 years. All procedures were performed by a single surgeon with a navigation system. The degree of rotation of the tibial trial component established by a just-medial to the tibial tuberosity and self-aligned technique was compared.
  
  
  RESULTS
  A mean of the degree of the tibial component rotation with the self-aligned of the center-post technique was 3 degrees more externally rotated than the just-medial to the tibial tuberosity technique. The self-aligned technique had standard deviations of 4.41 degrees, of which was significantly less variable (p < 0.05) than 5.94 degrees of the just-medial to the tibial tuberosity technique.
  
  
  CONCLUSIONS
  The authors conclude that establishment of the tibial component rotation by using the self-aligned of the center-post technique will rotate the component more external compared with the just-medial to the tibial tuberosity technique.
authors: Department of Orthopaedics, Phramongkutklao Hospital, Bangkok, Thailand.
authors: Thanainit
authors: T
authors: Chotanaphuti
authors: Watcharin
authors: W
authors: Panichcharoen
authors: Artit
authors: A
authors: Laoruengthana
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012399:Rotation; D025321:Surgery, Computer-Assisted; D013977:Tibia / Q000033:anatomy & histology