title: Minimally Invasive Computer-Assisted Total Knee Arthroplasty Compared With Conventional Total Knee Arthroplasty: A Prospective 9-Year Follow-Up.
abstract: Studies on minimally invasive computer-assisted total knee arthroplasty (MICA-TKA) have shown promising results, but are limited by short follow-up. The purpose of this study was to compare the midterm radiographic features and functional outcomes between patients who underwent MICA-TKA and conventional TKA.
  
  
  
  A total of 108 patients who were randomized to undergo MICA-TKA or conventional TKA during 2004 and 2005 were contacted for a prospective follow-up review. Patients who were lost to contact, have passed away, or declined to participate in the study were excluded. Objective functional measurements and radiographs were obtained for assessment.
  
  
  
  By the time of this study, 2 patients from the conventional group had undergone revision TKA, one due to infection and one due to aseptic loosening. A total of 67 patients (62.04%) were followed up for an average period of 9.07 years (8.51-9.61 years). At follow-up, functional scores were comparable between the 2 groups. No significant intergroup differences were found in mechanical knee alignment and component placement angle in the coronal views. No statistical or clinical significance were noticed in radiographic signs of component loosening.
  
  
  
  MICA-TKA provided similar clinical, functional, and radiographic outcomes compared with conventional TKA after an average of 9-year follow-up. This technique can be used to exploit its short-term advantages without compromising midterm outcomes.
authors.affiliation: Duke-NUS Graduate Medical School, Singapore.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhu
authors.affiliation: Department of Orthopeadic Surgery, Singapore General Hospital, Singapore.
authors.forename: Chia Liang
authors.initials: CL
authors.lastname: Ang
authors.affiliation: Department of Orthopeadic Surgery, Singapore General Hospital, Singapore.
authors.forename: Seng Jin
authors.initials: SJ
authors.lastname: Yeo
authors.affiliation: Department of Orthopeadic Surgery, Singapore General Hospital, Singapore.
authors.forename: Ngai Nung
authors.initials: NN
authors.lastname: Lo
authors.affiliation: Department of Orthopeadic Surgery, Singapore General Hospital, Singapore.
authors.forename: Shi-Lu
authors.initials: SL
authors.lastname: Chia
authors.affiliation: Department of Orthopeadic Surgery, Singapore General Hospital, Singapore.
authors.forename: Hwei Chi
authors.initials: HC
authors.lastname: Chong
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures; D011446:Prospective Studies; D020127:Recovery of Function; D025321:Surgery, Computer-Assisted; D016896:Treatment Outcome
keywords: computer-assisted surgery; long-term follow-up; minimally invasive surgery; navigation; total knee arthroplasty; treatment outcome