title: Ipsilateral varus knee alignment correlates with increased femoral stem anteversion in primary total hip arthroplasty.
abstract: OBJECTIVE
  The purpose of this study was to evaluate whether the ipsilateral knee alignment secondary to knee osteoarthritis affect positioning of the femoral component anteversion during total hip arthroplasty.
  
  
  METHODS
  Preoperative and postoperative computed tomography-based 3-D femoral models were reconstructed for 20 total hip arthroplasty patients. Prosthetic femoral stem and native femoral anteversion was measured and compared.
  
  
  RESULTS
  An average increase by 4.5° ± 8.1° in femoral anteversion was found following total hip arthroplasty (p = 0.02). Strong positive correlation was found between the knee varus angle and the changes in femoral anteversion (R = 0.87, p&lt;0.0001). The knee alignment was an independent factor for predicting the intraoperative positioning of femoral stem anteversion.
  
  
  CONCLUSIONS
  The ipsilateral knee varus deformity should be considered to optimise the femoral component position during contemporary total hip arthroplasty.
authors.affiliation: Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston - USA.|Department of Orthopaedic Surgery, Jeju National University School of Medicine, Jeju - Republic of Korea.
authors.forename: Kwang Woo
authors.initials: KW
authors.lastname: Nam
authors.affiliation: Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston - USA.
authors.forename: Tsung-Yuan
authors.initials: TY
authors.lastname: Tsai
authors.affiliation: Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston - USA.
authors.forename: Dimitris
authors.initials: D
authors.lastname: Dimitriou
authors.affiliation: Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston - USA.
authors.forename: Guoan
authors.initials: G
authors.lastname: Li
authors.affiliation: Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston - USA.
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Kwon
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D060750:Bone Anteversion / Q000175:diagnosis / Q000209:etiology*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D021621:Imaging, Three-Dimensional; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008297:Male; D011183:Postoperative Complications; D011475:Prosthesis Failure; D014057:Tomography, X-Ray Computed