title: A Core Outcome Measures Index (COMI) for patients undergoing hip arthroplasty.
abstract: Outcome is best assessed with both generic and disease-specific instruments, but using many, lengthy questionnaires increases the burden, quality, and cost of data collection.We evaluated a short, hip-oriented Core Outcome Measures Index (COMI-hip), comprising six items (pain, function, symptom-specific well-being, quality of life, and disability) extracted from established full-length questionnaires; 214 consecutive total hip arthroplasty (THA) patients participated. Scores for the single items and sum-score of COMI-hip correlated well with those of the full-length instruments (r= -0.56 to -0.88). At 6 and 12 months' follow-up, the COMI-hip showed similar responsiveness (Cohen's d for effect size, 1.36-3.08) to the full-length questionnaires (1.65-2.34). The COMI-hip proved a simple but valid outcome instrument in THA patients. Its brevity renders it a potentially valuable instrument for routine use.
authors.affiliation: Department of Research & Development, Schulthess Clinic, Lengghalde 2, 8008, Zurich, Switzerland.
authors.forename: Franco M
authors.initials: FM
authors.lastname: Impellizzeri
authors.forename: Anne F
authors.initials: AF
authors.lastname: Mannion
authors.forename: Florian D
authors.initials: FD
authors.lastname: Naal
authors.forename: Michael
authors.initials: M
authors.lastname: Leunig
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011795:Surveys and Questionnaires
keywords: patient-related outcomes; psychometrics; questionnaires; total hip replacement; validity