title: [Clinical factors and findings in knee arthroscopy of patients with knee arthrosis candidates for conversion to total replacement].
abstract: OBJECTIVE
  To identify those clinical characteristic and arthroscopic findings in patients with knee arthrosis that are associated with worsening of the disease and subsequent total knee arthroplasty (TKA).
  
  
  METHODS
  A retrospective, descriptive study was conducted on 78 consecutive patients (88 knees) who underwent knee arthroscopy for arthrosis. The study included 44 women and 34 men, with a mean age of 58.9 years (range: 37-78 years). After a mean follow-up of 50.4 months (range: 12-96 months), those patients who progressed towards TKA were identified. A logistic regression model was applied to recognise the factors associated with deterioration of the arthrosis, with consequent progression towards a TKA.
  
  
  RESULTS
  Twenty-four out of the 88 knees progressed towards a TKA (27.3%) within a mean time of 13.5 months after arthroscopy (range: 13-29 months). The clinical characteristics that showed a significant association with poor progression of the arthrosis were: female gender (0.02) and Ahlbäck 2 (P=.04). Arthroscopic finding that proved significant correlation with worsening of the arthrosis towards TKA were: meniscal tears of the posterior horn (P=.02), meniscectomies above 60% (P=.03), and 2nd degree chondral lesions in loading areas of the medial femoral condyle (P=.02).
  
  
  CONCLUSIONS
  The variables associated with a greater chance of progressing towards a TKA after a knee arthroscopy due to arthrosis in this study were, female gender, grade 2 radiographic arthrosis, posterior horn meniscal lesions, meniscectomies over 60%, and chondral lesions in loading area of the medial femoral condyle.
authors.affiliation: Unidad de Cirugía de Rodilla y Artroscopia, Departamento de Traumatología y Ortopedia, Facultad de Medicina Clínica Alemana de Santiago, Universidad del Desarrollo, Santiago, Chile.
authors.forename: D
authors.initials: D
authors.lastname: Figueroa
authors.forename: R
authors.initials: R
authors.lastname: Calvo
authors.forename: I
authors.initials: I
authors.lastname: Villalón
authors.forename: M J
authors.initials: MJ
authors.lastname: Tuca
authors.forename: A
authors.initials: A
authors.lastname: Vaisman
authors.forename: M
authors.initials: M
authors.lastname: Valdés
mesh_terms: D000328:Adult; D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D001182:Arthroscopy; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000601:surgery*; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
keywords: Arthroplasty; Arthroscopy; Artroplastia; Artroscopia; Artrosis; Knee; Osteoarthritis; Prognosis; Pronóstico; Rodilla