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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/29540

Title: Comparative Validity and Responsiveness of the HOOS-PS and KOOS-PS to the WOMAC Physical Function Subscale in Total Joint Replacement for Osteoarthritis
Authors: Davis AM, AM
Perruccio, AV
Canizares, M
Hawker, GA
Roos, EM
Maillefert, JF
Lohmander, SL
Keywords: Validation of the HOOS-PS/KOOS-PS in TJR
Issue Date: 2009
Publisher: Osteoarthritis and Cartilage
Citation: Osteoarthritis and Cartilage. 2009; 17, 843-847
Abstract: Objective: To evaluate the internal consistency of the Hip disability and Osteoarthritis Outcome Score- Physical Short (HOOS-PS) and the Knee injury and Osteoarthritis Outcome Score- Physical Short (KOOS-PS) in total hip (THR) and total knee (TKR) replacement. Construct validity and responsiveness were compared to the WOMAC Likert 3.0 physical function subscale (PF) and the PF excluding the items in the short measures (PF-exclusions). Methods: Participants completed the full HOOS or KOOS, measures of fatigue, anxiety, depression and the Chronic Pain Grade (CPG) pre surgery and the HOOS or KOOS 6 months post surgery. Internal consistency for the HOOS-PS and KOOS-PS was calculated using Cronbach’s alpha. For construct validity, it was hypothesized that correlations between the HOOS-PS or KOOS-PS and PF and PF-exclusions with fatigue, CPG, anxiety and depression and HOOS/KOOS pain scales would differ by magnitudes of < 0.1. Standardized response means (SRM) were calculated for the HOOS-PS, KOOS-PS, PF and PF-exclusions and hypothesized to be >1. Results: The THR group (n=201) had a mean age of 62.3 years; 53.2% were female. The TKR group (n=248) had a mean age of 64.5 years; 63.7% were female. Cronbach’s alpha was 0.79 and 0.89 for the HOOS-PS and KOOS-PS respectively confirming that the measures represented a homogeneous construct. The correlation of the HOOS-PS to the PF and PF-exclusions was 0.90 and 0.86 respectively; r=0.90 (PF) and r=0.85 (PF-exclusions) for the KOOS-PS. The results supported the construct validity hypotheses. For THR, the SRM was 1.5, 1.7 and 1.7 for the HOOS-PS, PF and PF-exclusions; for TKR, the SRM was 1.4, 1.5 and 1.7, respectively. Conclusions: The short HOOS-PS and KOOS-PS represent homogenous short measures of 3 physical function with similar construct validity and responsiveness to the 17-item PF. The HOOS-PS and KOOS-PS are parsimonious, valid and responsive for evaluating physical function in THR and TKR.
URI: http://hdl.handle.net/1807/29540
Appears in Collections:UofT Faculty publications

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