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Objective  To develop and establish the reliability, validity, measurement error, and minimum detectable change of a novel 30‐second fast‐paced walk test (30 SFW ) in persons with knee osteoarthritis ( OA ) that is easy to administer and can quantify walking performance in persons of all abilities.    Methods  Twenty females with symptomatic knee  OA  (mean age [ SD ] 58.30 [8.05] years) and 20 age‐ and sex‐matched asymptomatic controls (57.25 [8.71] years) participated in the study. Participants completed questionnaires of demographic and clinical data, the Knee Injury and Osteoarthritis Outcome Score ( KOOS ), and the 36‐item Short Form Health Survey ( SF ‐36) followed by 30 SFW  performance. Participants returned 2‐7 days later and performed the 30 SFW  again.    Results  The knee  OA  group reported function that was worse than controls (all  KOOS  subscales;  P  < 0.0001). The 30 SFW  intrarater and interrater reliability were excellent [ ICC  (2,1)  = 0.95‐0.99]. Knee  OA  participants walked a shorter distance in the 30 SFW  than controls (mean [ SD ]:  OA  44.4 m [9.5 m]; control 58.1 m [7.8 m];  P  < 0.0001). Positive strong correlations were found between the 30 SFW  and the  KOOS –Activity of Daily Living,  SF ‐36‐Physical Functioning, and  SF ‐36‐Physical Health Composite scores ( P  < 0.0001). A nonsignificant, weak correlation between 30 SFW  and  SF ‐36‐Mental Health scores was present ( r  = 0.32,  P  = 0.05).    Conclusion  The 30 SFW  has excellent intrarater and interrater reliability. The 30 SFW  demonstrated excellent known groups, convergent, and discriminant validity as a measure of short‐distance walking ability in persons with knee  OA . Clinicians and researchers should consider using the 30 SFW  to quantify walking ability in persons with knee  OA  and assess walking ability change.

acr open rheumatology

The Validity, Reliability, Measurement Error, and Minimum Detectable Change of the 30‐Second Fast‐Paced Walk Test in Persons with Knee Osteoarthritis: A Novel Test of Short‐Distance Walking Ability