title: KNEE ARTHROPLASTY REVISION WITH A CONSTRAINED IMPLANT USING HINGE AND ROTATING TIBIAL BASIS.
abstract: OBJECTIVE
  To evaluate the results of total knee arthoplasty revisions performed in high complexity cases, with large bone defects or serious ligament deficiencies using a constrained implant hinge associated to a rotating tibial basis.
  
  
  METHODS
  We evaluated 11 patients in which we used the constrained implant hinge associated to rotating tibial basis, with minimum follow-up of two years. The indications for the procedure included instability, septic loosening, late postoperative infection without loosening and periprosthetic fracture. We evaluated the knee range of movement and functional outcomes by the Knee Society Score (KSS) e Knee Injury and Osteoarthritis Outcome Score (KOOS), besides the presence of complications.
  
  
  RESULTS
  All patients achieved 5(o) to 85(o) minimum range of motion at 1 year postoperatively and, in the present evaluation, KSS ranged from 67 to 95. Three patients had no complications until the last evaluation and two patients required implant revision.
  
  
  CONCLUSIONS
  Despite the complications rate observed, the functional result were acceptable for most patients, and it proved being a viable alternative, especially for patients with low functional demand. Level of Evidence IV, Case Series.
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, Knee Surgery Group, São Paulo, SP, Brasil.
authors.forename: Fabio Jansen
authors.initials: FJ
authors.lastname: Angelini
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, Knee Surgery Group, São Paulo, SP, Brasil.
authors.forename: Camilo Partezani
authors.initials: CP
authors.lastname: Helito
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, Knee Surgery Group, São Paulo, SP, Brasil.
authors.forename: Bruno Azevedo
authors.initials: BA
authors.lastname: Veronesi
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, Knee Surgery Group, São Paulo, SP, Brasil.
authors.forename: Tales Mollica
authors.initials: TM
authors.lastname: Guimarães
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, Knee Surgery Group, São Paulo, SP, Brasil.
authors.forename: José Ricardo
authors.initials: JR
authors.lastname: Pécora
authors.affiliation: . Universidade de São Paulo, Faculdade de Medicina, Department of Orthopedics and Traumatology, Knee Surgery Group, São Paulo, SP, Brasil.
authors.forename: Marco Kawamura
authors.initials: MK
authors.lastname: Demange
keywords: Arthroplasty, replacement, knee; Prostheses and Implants