title: Influence of the cause of the revision on the outcome after revision knee arthroplasty with condylar constrained implant.
abstract: BACKGROUND
  Revision total knee arthroplasty (TKA) is a common procedure with varying results depending on the cause. Our objective was to compare the clinical and radiological outcomes in patients undergoing aseptic revision versus revision due to prosthetic infection.
  
  
  METHODS
  The study included 41 patients who underwent TKA revision with the same varus-valgus constrained implant. In all cases a clinical evaluation was performed including pain, range of motion (ROM), Knee Society Score (KSS), complications, as well as radiological study. A comparative analysis was performed on the pre- and postoperative results between septic and aseptic groups. The mean follow-up was 6 years.
  
  
  RESULTS
  ROM had a mean increase of 17 degrees (p<.01). KSS and functional KSS improved significantly postoperatively. In the radiological study, joint interline and limb alignment were restored in all cases. Radiolucencies were found in 36.5% of cases; however they were unrelated to the appearance of loosening of the implant. There were complications in 29.2% of cases, mostly related to the surgical wound. Mobility, KSS, KSS functional and satisfaction at follow-up were better in the septic group. Implant survival was 95% at follow-up.
  
  
  CONCLUSIONS
  Revision arthroplasty with constrained varus-valgus implant is safe, and has successful mid-term results despite the cause of the replacement procedure.
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Gregorio Marañón, Madrid, España. Electronic address: pagilmar@hotmail.com.
authors.forename: P
authors.initials: P
authors.lastname: Gil-Martínez
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Gregorio Marañón, Madrid, España.
authors.forename: P
authors.initials: P
authors.lastname: Sanz
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Gregorio Marañón, Madrid, España.
authors.forename: I
authors.initials: I
authors.lastname: López-Torres
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Gregorio Marañón, Madrid, España.
authors.forename: J
authors.initials: J
authors.lastname: Arnal-Burró
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Gregorio Marañón, Madrid, España.
authors.forename: F
authors.initials: F
authors.lastname: Chana
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital Gregorio Marañón, Madrid, España.
authors.forename: J
authors.initials: J
authors.lastname: Vaquero
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections / Q000601:surgery*; D012086:Reoperation / Q000295:instrumentation*; D016896:Treatment Outcome
keywords: Inserto varo-valgo constreñido; Knee; Prosthetic revision; Revisión protésica; Rodilla; Varus-valgus constrained implant