title: Comparison of patient reported outcomes after Triathlon(®) and Kinemax Plus prostheses.
abstract: BACKGROUND
  The Triathlon(®) (Stryker, Kalamazoo, MI, US) total knee replacement was designed to improve patient function and survivorship. The aim of this study was to determine whether the Triathlon(®) prosthesis produces better patient reported outcomes than a previous design by the same manufacturer, the Kinemax Plus.
  
  
  METHODS
  The outcome of 233 knees of patients with a mean age of 68 years (range: 40-80 years) who received the Kinemax Plus prosthesis were compared with the outcomes of 220 knees of patients with a mean age of 70 years (range: 42-90 years) who received the Triathlon(®) prosthesis. Data were collected via postal questionnaire prior to surgery as well as at 8-12 weeks and at 1 year following surgery. Validated questionnaires were used including the WOMAC(®) (Western Ontario and McMaster Universities) pain and function scales, the Knee injury and Osteoarthritis Outcome Score quality of life scale and the self-administered patient satisfaction scale.
  
  
  RESULTS
  This study found that patients who had the Triathlon(®) prosthesis had significantly better pain relief (p<0.0001), function (p=0.028), knee related quality of life (p<0.0001) and satisfaction (p=0.0003) at three months after surgery than those who received the Kinemax Plus prosthesis. In addition, knee related quality of life (p=0.002) and satisfaction (p=0.021) were significantly higher at one year after surgery in Triathlon(®)
  
  
  METHODS
  
  
  
  CONCLUSIONS
  The findings suggest that return to function and reduction in pain may occur more quickly in patients with a Triathlon(®) prosthesis than in those with the Kinemax Plus.
authors.affiliation: North Bristol NHS Trust, UK. s.dixon@bristol.ac.uk.
authors.forename: S
authors.initials: S
authors.lastname: Dixon
authors.forename: A W
authors.initials: AW
authors.lastname: Blom
authors.forename: M R
authors.initials: MR
authors.lastname: Whitehouse
authors.forename: V
authors.initials: V
authors.lastname: Wylde
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000503:physiopathology / Q000523:psychology / Q000601:surgery*; D019645:Arthroplasty, Replacement, Knee / Q000523:psychology* / Q000534:rehabilitation; D006801:Humans; D007720:Knee Prosthesis / Q000523:psychology* / Q000592:standards; D008875:Middle Aged; D015337:Multicenter Studies as Topic; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000523:psychology / Q000601:surgery*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000523:psychology; D017060:Patient Satisfaction; D011446:Prospective Studies; D011788:Quality of Life; D016032:Randomized Controlled Trials as Topic; D020127:Recovery of Function / Q000502:physiology; D011795:Surveys and Questionnaires; D016896:Treatment Outcome