title: Comparison of Midterm Outcomes of Minimally Invasive Computer-Assisted vs Minimally Invasive Jig-Based Total Knee Arthroplasty.
abstract: Minimally invasive surgery (MIS) has perceived advantages in the early postoperative stage for total knee arthroplasty (TKA). It is not clear whether the improved radiographic alignment achieved by computer-assisted navigation surgery (CAS) improves midterm clinical outcomes. The aim of this study was to compare patient outcomes of MIS TKA performed with and without CAS after a minimum follow-up of 7 years.
  
  
  
  Between 2007 and 2009, 50 patients underwent CAS and MIS TKA, and 50 patients underwent jig-based MIS TKA in this prospective study. Ninety-six patients were evaluated after a mean follow-up of 7.7 years, and clinical and radiological evaluations were performed.
  
  
  
  Midterm results demonstrated that the Knee Society knee score, function score, and range of motion were comparable in the 2 groups. The percentage of patients with the mechanical axis within ±3° of neutral was significantly higher in the CAS group than in the jig-based group (94% vs 79%, respectively; P = .038). No knees had loosening after TKA. However, 1 patient in the CAS group demonstrated late infection 4 years postoperatively.
  
  
  
  CAS did not improve midterm outcomes after MIS TKA compared with jig-based surgery, although CAS reduced outliers in coronal alignment.
authors: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan.
authors: Masahiro
authors: M
authors: Hasegawa
authors: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan.
authors: Shinichi
authors: S
authors: Miyazaki
authors: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan.
authors: Toshio
authors: T
authors: Yamaguchi
authors: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan.
authors: Hiroki
authors: H
authors: Wakabayashi
authors: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu, Mie, Japan.
authors: Akihiro
authors: A
authors: Sudo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001168:Arthritis / Q000601:surgery*; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006305:Health Status Indicators; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D008297:Male; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation / Q000379:methods*; D011446:Prospective Studies; D016059:Range of Motion, Articular; D020127:Recovery of Function; D013238:Stereotaxic Techniques / Q000295:instrumentation; D025321:Surgery, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D016896:Treatment Outcome
keywords: computer-assisted navigation surgery; midterm results; minimally invasive surgery; posterior stabilized; total knee arthroplasty