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


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.


CONCLUSIONS
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.
University of Edinburgh, Edinburgh, UK.
D F
DF
Hamilton
Medical University of Innsbruck, Innsbruck, Austria.
F L
FL
Loth
Medical University of Innsbruck, Innsbruck, Austria.
J M
JM
Giesinger
Kantonsspital St. Gallen, St Gallen, Switzerland.
K
K
Giesinger
University of Edinburgh, Edinburgh, UK.
D J
DJ
MacDonald
University of Edinburgh, Edinburgh, UK.
J T
JT
Patton
Royal Infirmary of Edinburgh, 51 Little France Crescent, Old Dalkeith Road, Edinburgh, EH16 4SA, UK.
A H R W
AH
Simpson
University of Edinburgh, Edinburgh, UK.
C R
CR
Howie
D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000523:psychology; D019645:Arthroplasty, Replacement, Knee / Q000523:psychology; D001364:Awareness; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D010003:Osteoarthritis / Q000523:psychology / Q000601:surgery*; D017063:Outcome Assessment, Health Care; D011446:Prospective Studies; D011594:Psychometrics; D020127:Recovery of Function; D006113:United Kingdom
Arthroplasty; Patient reported outcomes; Total hip arthroplasty; Total knee arthroplasty; Validation