title: Total knee arthroplasty with computer-assisted navigation: an analysis of 200 cases.
abstract: OBJECTIVE
  to evaluate the results from surgery with computer-assisted navigation in cases of total knee arthroplasty.
  
  
  METHODS
  a total of 196 patients who underwent total knee arthroplasty with computer-assisted navigation were evaluated. The extension and flexion spaces (gaps) were evaluated during the operation and the alignment after the operation was assessed. The Knee Society Score (KSS) questionnaire for assessing patient's function was applied preoperatively and postoperatively after a mean follow-up of 22 months.
  
  
  RESULTS
  in all, 86.7% of the patients presented good alignment of the mechanical axis (less than 3° of varus or valgus in relation to the mechanical axis) and 96.4% of the patients presented balanced flexion and extension gaps. Before the operation, 97% of the patients presented poor or insufficient KSS, but after the operation, 77.6% presented good or excellent KSS.
  
  
  CONCLUSIONS
  the navigation system made it possible to achieve aligned and balanced implants, with notable functional improvement among the patients. It was found to be useful in assessing, understanding and improving knowledge in relation to performing arthroplasty procedures.
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Marcus Vinicius Malheiros
authors.initials: MV
authors.lastname: Luzo
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Luiz Felipe Morlin
authors.initials: LF
authors.lastname: Ambra
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Pedro
authors.initials: P
authors.lastname: Debieux
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Carlos Eduardo da Silveira
authors.initials: CE
authors.lastname: Franciozi
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Raquel Ribeiro
authors.initials: RR
authors.lastname: Costi
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Marcelo de Toledo
authors.initials: Mde T
authors.lastname: Petrilli
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Marcelo Seiji
authors.initials: MS
authors.lastname: Kubota
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Leonardo José Bernardes
authors.initials: LJ
authors.lastname: Albertoni
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Antônio Altenor Bessa
authors.initials: AA
authors.lastname: de Queiroz
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Fábio Pacheco
authors.initials: FP
authors.lastname: Ferreira
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Geraldo Sérgio de Mello
authors.initials: GS
authors.lastname: Granata Júnior
authors.affiliation: Orthopedics and Traumatology Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
authors.forename: Mário
authors.initials: M
authors.lastname: Carneiro Filho
keywords: Arthroplasty replacement; Computer-assisted surgery; Knee