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JOURNAL ARTICLE
VALIDATION STUDY
Assessment of reliability, validity, responsiveness and minimally important change of the German Hip dysfunction and osteoarthritis outcome score (HOOS) in patients with osteoarthritis of the hip.
Rheumatology International 2017 December
Patient-reported outcome measures are a critical tool in evaluating the efficacy of orthopedic procedures. The intention of this study was to evaluate reliability, validity, responsiveness and minimally important change of the German version of the Hip dysfunction and osteoarthritis outcome score (HOOS). The German HOOS was investigated in 251 consecutive patients before and 6 months after total hip arthroplasty. All patients completed HOOS, Oxford-Hip Score, Short-Form (SF-36) and numeric scales for pain and disability. Test-retest reliability, internal consistency, floor and ceiling effects, construct validity and minimal important change were analyzed. The German HOOS demonstrated excellent test-retest reliability with intraclass correlation coefficient values > 0.7. Cronbach´s alpha values demonstrated strong internal consistency. As hypothesized, HOOS subscales strongly correlated with corresponding OHS and SF-36 domains. All subscales showed excellent (effect size/standardized response means > 0.8) responsiveness between preoperative assessment and postoperative follow-up. The HOOS and all subdomains showed higher changes than the minimal detectable change which indicates true changes. The German version of the HOOS demonstrated good psychometric properties. It proved to be valid, reliable and responsive to the changes instrument for use in patients with hip osteoarthritis undergoing total hip replacement.
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