ArticleJournal of rehabilitation medicine2026
Psychometric properties of loaded and unloaded timed stair tests in assessing people with knee osteoarthritis.
Article in Journal of rehabilitation medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo compare timed stair test performance between individuals with knee osteoarthritis and healthy older adults, examine reliability under loaded and unloaded conditions, explore correlations with functional measures, and identify optimal cut-off times.
designCross-sectional study. SUBJECTS/PATIENTS: Sixty individuals with knee osteoarthritis and 30 healthy older adults.
methodsParticipants completed unloaded and loaded timed stair test trials 7 days apart. Knee strength, balance, mobility, and self-reported outcomes were assessed.
resultsMean completion times for osteoarthritis participants were 23.91 s (unloaded) and 25.40 s (loaded). Intra-rater (ICC3,1 = 0.951-0.990 across raters and assessment days) and inter-rater (ICC3,2 = 0.999 [unloaded] to 1.000 [loaded]) reliabilities were excellent. Test-retest reliability was good for loaded (0.835) and excellent for unloaded (0.918) conditions. Times correlated negatively with affected side knee strength, balance, and confidence, and positively with pain severity, mobility tests, and daily activity difficulty. Optimal cut-offs were 18.67 s (unloaded) and 19.94 s (loaded), demonstrating sensitivities of 70.0% (unloaded) and 68.3% (loaded), a specificity of 86.7%, and area under the curve values of 0.78 (unloaded) and 0.77 (loaded).
conclusionThe timed stair test is a reliable, valid, and practical measure of functional performance in knee osteoarthritis, effectively distinguishing movement capability under loaded and unloaded conditions.
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