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            "abstractNote": "OBJECTIVE\n\nEvaluation of the internal construct validity of the Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index adapted for use in patients with femoro-acetabular impingement (FAI) and osteoarthritis (OA) of the hip.\n\n\nMETHODS\n\nDistribution of a German version of WOMAC to patients upon first consultation. Patients with FAI [n=100, mean age 31.7 years, standard deviation (SD) 9.7] and OA (n=57, mean age 60.3 years, SD 11.7) and without comorbidities or prior hip surgery were included and compared to age- and gender-matched control population to FAI (n=200, mean age 32.6 years, SD 5.6). WOMAC data of 157 questionnaires were evaluated by Rasch analysis using RUMM2020 software.\n\n\nRESULTS\n\nSummation of total WOMAC shows misfit to the Rasch model as well as multidimensionality. While the pain subset shows adequate fit and is unidimensional, item reduction is required to fit a unidimensional subset of functional items to the Rasch model. Summating the two fitting subsets yields again slight model misfit and multidimensionality requiring further item reduction. Finally, a 12-item version of the total WOMAC shows good model fit and unidimensionality, i.e., internal construct validity, for assessment of patients with FAI and OA without differential item functioning (DIF). A person separation index (PSI)=0.93 indicates a high internal consistency reliability for the 12-item subscale. Scores for FAI are significantly higher than control (P<0.001, effect size 0.71) and lower than OA group (P<0.001, effect size 0.45). Adequate statistical power is shown discriminating the three groups, therefore indicating some evidence also for external construct validity.\n\n\nCONCLUSIONS\n\nThe WOMAC as a total construct is multidimensional and summating the subsets into a total score is not valid. The reduced 12-item WOMAC is demonstrated to have internal construct validity for assessing patients with FAI and OA on the same scale and high internal consistency reliability. Discrimination of the groups with adequate statistical power also indicates external construct validity.",
            "publicationTitle": "Osteoarthritis and Cartilage / OARS, Osteoarthritis Research Society",
            "publisher": "",
            "place": "",
            "date": "Sep 2008",
            "volume": "16",
            "issue": "9",
            "section": "",
            "partNumber": "",
            "partTitle": "",
            "pages": "1032-1038",
            "series": "",
            "seriesTitle": "",
            "seriesText": "",
            "journalAbbreviation": "Osteoarthr. Cartil.",
            "DOI": "10.1016/j.joca.2008.02.006",
            "citationKey": "",
            "url": "http://www.ncbi.nlm.nih.gov/pubmed/18602281",
            "accessDate": "2012-06-13T20:04:58Z",
            "PMID": "",
            "PMCID": "",
            "ISSN": "1522-9653",
            "archive": "",
            "archiveLocation": "",
            "shortTitle": "",
            "language": "",
            "libraryCatalog": "NCBI PubMed",
            "callNumber": "",
            "rights": "",
            "extra": "PMID: 18602281",
            "tags": [
                {
                    "tag": "Acetabulum",
                    "type": 1
                },
                {
                    "tag": "Adult",
                    "type": 1
                },
                {
                    "tag": "Disability Evaluation",
                    "type": 1
                },
                {
                    "tag": "Evaluation Studies as Topic",
                    "type": 1
                },
                {
                    "tag": "Female",
                    "type": 1
                },
                {
                    "tag": "Femur Head",
                    "type": 1
                },
                {
                    "tag": "Humans",
                    "type": 1
                },
                {
                    "tag": "Male",
                    "type": 1
                },
                {
                    "tag": "Osteoarthritis, Hip",
                    "type": 1
                },
                {
                    "tag": "Pain",
                    "type": 1
                },
                {
                    "tag": "Pain Measurement",
                    "type": 1
                },
                {
                    "tag": "Psychometrics",
                    "type": 1
                },
                {
                    "tag": "Quality of Life",
                    "type": 1
                },
                {
                    "tag": "Questionnaires",
                    "type": 1
                },
                {
                    "tag": "Reproducibility of Results",
                    "type": 1
                },
                {
                    "tag": "Severity of Illness Index",
                    "type": 1
                }
            ],
            "collections": [],
            "relations": {},
            "dateAdded": "2012-06-13T20:26:31Z",
            "dateModified": "2012-06-13T20:26:31Z"
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            "creatorSummary": "Leunig et al.",
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            "version": 1,
            "itemType": "journalArticle",
            "title": "The Concept of Femoroacetabular Impingement: Current Status and Future Perspectives",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "Michael",
                    "lastName": "Leunig"
                },
                {
                    "creatorType": "author",
                    "firstName": "Paul E.",
                    "lastName": "Beaulé"
                },
                {
                    "creatorType": "author",
                    "firstName": "Reinhold",
                    "lastName": "Ganz"
                }
            ],
            "abstractNote": "Femoroacetabular impingement (FAI) is a recently proposed mechanism causing abnormal contact stresses and potential joint damage around the hip. In the majority of cases, a bony deformity or spatial malorientation of the femoral head or head/neck junction, acetabulum, or both cause FAI. Supraphysiologic motion or high impact might cause FAI even with very mild bony alterations. FAI became of interest to the medical field when (1) evidence began to emerge suggesting that FAI may initiate osteoarthritis of the hip and when (2) adolescents and active adults with groin pain and imaging evidence of FAI were successfully treated addressing the causes of FAI. With an increased recognition and acceptance of FAI as a damage mechanism of the hip, defined standards of assessment and treatment need to be developed and established to provide high accuracy and precision in diagnosis. Early recognition of FAI followed by subsequent behavioral modification (profession, sports, etc) or even surgery may reduce the rate of OA due to FAI.",
            "publicationTitle": "Clinical Orthopaedics and Related Research",
            "publisher": "",
            "place": "",
            "date": "2009-3",
            "volume": "467",
            "issue": "3",
            "section": "",
            "partNumber": "",
            "partTitle": "",
            "pages": "616-622",
            "series": "",
            "seriesTitle": "",
            "seriesText": "",
            "journalAbbreviation": "Clin Orthop Relat Res",
            "DOI": "10.1007/s11999-008-0646-0",
            "citationKey": "",
            "url": "",
            "accessDate": "",
            "PMID": "",
            "PMCID": "",
            "ISSN": "0009-921X",
            "archive": "",
            "archiveLocation": "",
            "shortTitle": "The Concept of Femoroacetabular Impingement",
            "language": "",
            "libraryCatalog": "PubMed Central",
            "callNumber": "",
            "rights": "",
            "extra": "PMID: 19082681\nPMCID: PMC2635437",
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            "dateAdded": "2012-06-13T20:26:31Z",
            "dateModified": "2012-06-13T20:26:31Z"
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