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- Title
The OARSI core set of performance-based measures for knee osteoarthritis is reliable but not valid and responsive.
- Authors
Tolk, J. J.; Janssen, R. P. A.; Prinsen, C. A. C.; Latijnhouwers, D. A. J. M.; van der Steen, M. C.; Bierma-Zeinstra, S. M. A.; Reijman, M.
- Abstract
<bold>Purpose: </bold>The Osteoarthritis Research Society International has identified a core set of performance-based tests of physical function for use in people with knee osteoarthritis (OA). The core set consists of the 30-second chair stand test (30-s CST), 4 × 10 m fast-paced walk test (40 m FPWT) and a stair climb test. The aim of this study was to evaluate the reliability, validity and responsiveness of these performance-based measures to assess the ability to measure physical function in knee OA patients.<bold>Methods: </bold>A prospective cohort study of 85 knee OA patients indicated for total knee arthroplasty (TKA) was performed. Construct validity and responsiveness were assessed by testing of predefined hypotheses. A subgroup (n = 30) underwent test-retest measurements for reliability analysis. The Oxford Knee Score, Knee injury and Osteoarthritis Outcome Score-Physical Function Short Form, pain during activity score and knee extensor strength were used as comparator instruments. Measurements were obtained at baseline and 12 months after TKA.<bold>Results: </bold>Appropriate test-retest reliability was found for all three tests. Intraclass correlation coefficient (ICC) for the 30-s CST was 0.90 (95% CI 0.68; 0.96), 40 m FPWT 0.93 (0.85; 0.96) and for the 10-step stair climb test (10-step SCT) 0.94 (0.89; 0.97). Adequate construct validity could not be confirmed for the three tests. For the 30-s CST, 42% of the predefined hypotheses were confirmed; for the 40 m FPWT, 27% and for the 10-step SCT 36% were confirmed. The 40 m FPWT was found to be responsive with 75% of predefined hypothesis confirmed, whereas the responsiveness for the other tests could not be confirmed. For the 30 s CST and 10-step SCT, only 50% of hypotheses were confirmed.<bold>Conclusions: </bold>The three performance-based tests had good reliability, but poor construct validity and responsiveness in the assessment of function for the domains sit-to-stand movement, walking short distances and stair negotiation. The findings of the present study do not justify their use for clinical practice.<bold>Level Of Evidence: </bold>Level 1. Diagnostic study.
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2019, Vol 27, Issue 9, p2898
- ISSN
0942-2056
- Publication type
Article
- DOI
10.1007/s00167-017-4789-y