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The development of a short measure of physical function for knee OA KOOS-Physical Function Shortform (KOOS-PS) - an OARSI/OMERACT initiative

Perruccio, A V; Lohmander, Stefan LU ; Canizares, M; Tennant, A; Hawker, G A; Conaghan, P G; Roos, Ewa LU ; Jordan, J M; Maillefert, J -F and Dougados, M, et al. (2008) In Osteoarthritis and Cartilage 16(5). p.542-550
Abstract
Objective: To develop a short measure of physical function for knee osteoarthritis (OA) using multi-national data from. individuals with varying degrees of severity of knee OA. Methods: Rasch analysis, based on the partial credit model, was conducted on Knee injury and Osteoarthritis Outcome Score and Western Ontario McMaster Universities' Osteoarthritis Index data from individuals with knee OA, ranging from community to pre-total knee replacement samples from five countries. Fit of the data to the Rasch model was evaluated by overall model fit and item-level fit statistics (chi(2), size of residual, F-test). Invariance across age, gender and country was evaluated. Unidimensionality was evaluated by factor analysis of residuals. The... (More)
Objective: To develop a short measure of physical function for knee osteoarthritis (OA) using multi-national data from. individuals with varying degrees of severity of knee OA. Methods: Rasch analysis, based on the partial credit model, was conducted on Knee injury and Osteoarthritis Outcome Score and Western Ontario McMaster Universities' Osteoarthritis Index data from individuals with knee OA, ranging from community to pre-total knee replacement samples from five countries. Fit of the data to the Rasch model was evaluated by overall model fit and item-level fit statistics (chi(2), size of residual, F-test). Invariance across age, gender and country was evaluated. Unidimensionality was evaluated by factor analysis of residuals. The derived short measure was further tested for fit through re-analyses in individual sub-samples. A nomogram converting raw summed scores to Rasch-derived interval scores was developed. Results: Thirteen data sets were included (n = 2145), with an age range of 26-95 years, and a male/female ratio of 1:1.4. The final model included seven of the original 22 items. From easiest to most difficult, the items (logit) were as follows: rising from bed (1.366), putting on socks/stockings (1.109), rising from sitting (0.537), bending to the floor (0.433), twisting/pivoting on injured knee (-0.861), kneeling (-1.292) and squatting (-1.292). Sub-sample analyses confirmed findings. Conclusion: Based on the use of accepted Rasch-based measurement methods and the compliment of countries, languages and OA severity represented in this study, our seven item short measure of physical function for knee OA is likely generalizable and widely applicable. This measure has potential for use as the function component in an OA severity scoring system. (Less)
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Contribution to journal
publication status
published
subject
keywords
physical function, knee osteoarthritis, Rasch analysis, outcome measure
in
Osteoarthritis and Cartilage
volume
16
issue
5
pages
542 - 550
publisher
Elsevier
external identifiers
  • wos:000255840600002
  • scopus:42149126995
ISSN
1063-4584
DOI
10.1016/j.joca.2007.12.014
language
English
LU publication?
yes
id
e83223a3-bbcb-4d65-bbdd-1cb01e2536c0 (old id 1203589)
date added to LUP
2008-09-17 09:49:50
date last changed
2017-10-29 03:38:24
@article{e83223a3-bbcb-4d65-bbdd-1cb01e2536c0,
  abstract     = {Objective: To develop a short measure of physical function for knee osteoarthritis (OA) using multi-national data from. individuals with varying degrees of severity of knee OA. Methods: Rasch analysis, based on the partial credit model, was conducted on Knee injury and Osteoarthritis Outcome Score and Western Ontario McMaster Universities' Osteoarthritis Index data from individuals with knee OA, ranging from community to pre-total knee replacement samples from five countries. Fit of the data to the Rasch model was evaluated by overall model fit and item-level fit statistics (chi(2), size of residual, F-test). Invariance across age, gender and country was evaluated. Unidimensionality was evaluated by factor analysis of residuals. The derived short measure was further tested for fit through re-analyses in individual sub-samples. A nomogram converting raw summed scores to Rasch-derived interval scores was developed. Results: Thirteen data sets were included (n = 2145), with an age range of 26-95 years, and a male/female ratio of 1:1.4. The final model included seven of the original 22 items. From easiest to most difficult, the items (logit) were as follows: rising from bed (1.366), putting on socks/stockings (1.109), rising from sitting (0.537), bending to the floor (0.433), twisting/pivoting on injured knee (-0.861), kneeling (-1.292) and squatting (-1.292). Sub-sample analyses confirmed findings. Conclusion: Based on the use of accepted Rasch-based measurement methods and the compliment of countries, languages and OA severity represented in this study, our seven item short measure of physical function for knee OA is likely generalizable and widely applicable. This measure has potential for use as the function component in an OA severity scoring system.},
  author       = {Perruccio, A V and Lohmander, Stefan and Canizares, M and Tennant, A and Hawker, G A and Conaghan, P G and Roos, Ewa and Jordan, J M and Maillefert, J -F and Dougados, M and Davis, A M},
  issn         = {1063-4584},
  keyword      = {physical function,knee osteoarthritis,Rasch analysis,outcome measure},
  language     = {eng},
  number       = {5},
  pages        = {542--550},
  publisher    = {Elsevier},
  series       = {Osteoarthritis and Cartilage},
  title        = {The development of a short measure of physical function for knee OA KOOS-Physical Function Shortform (KOOS-PS) - an OARSI/OMERACT initiative},
  url          = {http://dx.doi.org/10.1016/j.joca.2007.12.014},
  volume       = {16},
  year         = {2008},
}