title: Factors Predicting the Forgotten Joint Score After Total Knee Arthroplasty.
abstract: We recently developed the forgotten joint score 12 (FJS-12), a tool to assess joint awareness in everyday life. It is unknown whether patient factors predicting the outcome of the FJS-12 after total knee arthroplasty (TKA) exist.
  
  
  
  Five hundred forty cases of TKA were analyzed. Objective clinical results were obtained for range of motion, stability, and alignment. Patient-reported outcome was assessed using the FJS-12. Baseline data and complications were recorded. Cluster analysis based on FJS-12, postoperative flexion, and age resulted in 3 groups: poor outcome (88 patients), good outcome (340 patients), and excellent outcome (118 patients). The characteristics of "poor" compared to "excellent" clusters were studied more closely using bivariate comparative tests and logistic regression.
  
  
  
  We could find that male patients around 63 years with a lower body mass index were most likely to be allocated to the cluster "excellent" (defined as high FJS-12 and high postoperative flexion). Preoperative extension and flexion, stability, varus/valgus alignment, surgery prior TKA, or comorbidities were not predictive for the FJS-12 at 1 year follow-up.
  
  
  
  We identified 3 preoperative patient-related factors that may predict the FJS-12 after TKA: body mass index, age, and gender. These findings can be used to guide decision-making and important preoperative discussions on expectations after TKA.
authors.affiliation: Department of Orthopaedic Surgery and Traumatology, Kantonsspital St. Gallen, St. Gallen, Switzerland.
authors.forename: Henrik
authors.initials: H
authors.lastname: Behrend
authors.affiliation: Department of Orthopaedic Surgery and Traumatology, Kantonsspital St. Gallen, St. Gallen, Switzerland.
authors.forename: Vilijam
authors.initials: V
authors.lastname: Zdravkovic
authors.affiliation: Department of Psychiatry and Psychotherapy, Innsbruck Medical University, Innsbruck, Austria.
authors.forename: Johannes
authors.initials: J
authors.lastname: Giesinger
authors.affiliation: Department of Orthopaedic Surgery and Traumatology, Kantonsspital St. Gallen, St. Gallen, Switzerland.
authors.forename: Karlmeinrad
authors.initials: K
authors.lastname: Giesinger
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000523:psychology*; D001364:Awareness; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care / Q000379:methods*; D000071066:Patient Reported Outcome Measures; D011184:Postoperative Period; D016059:Range of Motion, Articular; D012737:Sex Factors
keywords: body mass index; forgotten joint score 12; patient-reported outcome; predictors; total knee arthroplasty