Validation of the English language Forgotten Joint Score-12 as an outcome measure for total hip and knee arthroplasty in a British population

D.F. Hamilton*, F.L. Loth, J.M. Giesinger, K. Giesinger, D.J. MacDonald, J.T. Patton, A.H.R.W. Simpson, C.R. Howie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)
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AIMS: To validate the English language Forgotten Joint Score-12 (FJS-12) as a tool to evaluate the outcome of hip and knee arthroplasty in a United Kingdom population.

PATIENTS AND METHODS: All patients undergoing surgery between January and August 2014 were eligible for inclusion. Prospective data were collected from 205 patients undergoing total hip arthroplasty (THA) and 231 patients undergoing total knee arthroplasty (TKA). Outcomes were assessed with the FJS-12 and the Oxford Hip and Knee Scores (OHS, OKS) pre-operatively, then at six and 12 months post-operatively. Internal consistency, convergent validity, effect size, relative validity and ceiling effects were determined.

RESULTS: Data for the TKA and THA patients showed high internal consistency for the FJS-12 (Cronbach α = 0.97 in TKAs, 0.98 in THAs). Convergent validity with the Oxford Scores was high (r = 0.85 in TKAs, r = 0.79 for THAs). From six to 12 months, the change was higher for the FJS-12 than for the OHS in THA patients (effect size d = 0.21 versus -0.03). Ceiling effects at one-year follow-up were low for the FJS-12 with just 3.9% (TKA) and 8.8% (THA) of patients achieving the best possible score.

CONCLUSION: The FJS-12 has strong measurement properties in terms of validity, internal consistency and sensitivity to change in TKA and THA patients. Low ceiling effects and good relative validity allow the monitoring of longer term outcomes, particularly in well-performing groups after total joint arthroplasty. Cite this article: Bone Joint J 2017;99-B:218-24.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalBone and Joint Journal
Issue number2
Early online date1 Feb 2017
Publication statusPublished - 1 Feb 2017


  • aged
  • arthroplasty, replacement, hip/psychology
  • arthroplasty, replacement, knee/psychology
  • awareness
  • female
  • health status indicators
  • humans
  • male
  • osteoarthritis/psychology
  • outcome assessment, health care
  • prospective studies
  • psychometrics
  • recovery of function
  • United Kingdom

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


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