{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,2]],"date-time":"2026-11-02T22:34:04Z","timestamp":1793658844858,"version":"4.5.1"},"reference-count":27,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2005,12,9]],"date-time":"2005-12-09T00:00:00Z","timestamp":1134086400000},"content-version":"vor","delay-in-days":5336,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arthritis &amp; Rheumatism"],"published-print":{"date-parts":[[1991,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Clinical criteria for the classification of patients with hip pain associated with osteoarthritis (OA) were developed through a multicenter study. Data from 201 patients who had experienced hip pain for most days of the prior month were analyzed. The comparison group of patients had other causes of hip pain, such as rheumatoid arthritis or spondylarthropathy. Variables from the medical history, physical examination, laboratory tests, and radiographs were used to develop different sets of criteria to serve different investigative purposes. Multivariate methods included the traditional \u201cnumber of criteria present\u201d format and \u201cclassification tree\u201d techniques.<\/jats:p>\n                  <jats:p>Clinical criteria: A classification tree was developed, without radiographs, for clinical and laboratory criteria or for clinical criteria alone. A patient was classified as having hip OA if pain was present in combination with either 1) hip internal rotation \u226515\u00ba, pain present on internal rotation of the hip, morning stiffness of the hip for \u226460 minutes, and age &gt;50 years, or 2) hip internal rotation &lt;15\u00ba and an erythrocyte sedimentation rate (ESR) \u226445 mm\/hour; if no ESR was obtained, hip flexion \u2264115\u00ba was substituted (sensitivity 86%; specificity 75%).<\/jats:p>\n                  <jats:p>Clinical plus radiographic criteria: The traditional format combined pain with at least 2 of the following 3 criteria: osteophytes (femoral or acetabular), joint space narrowing (superior, axial, and\/or medial), and ESR &lt;20 mm\/hour (sensitivity 89%; specificity 91%). The radiographic presence of osteophytes best separated OA patients and controls by the classification tree method (sensitivity 89%; specificity 91%).<\/jats:p>\n                  <jats:p>The \u201cnumber of criteria present\u201d format yielded criteria and levels of sensitivity and specificity similar to those of the classification tree for the combined clinical and radiographic criteria set. For the clinical criteria set, the classification tree provided much greater specificity. The value of the radiographic presence of an ostophyte in separating patients with OA of the hip from those with hip pain of other causes is emphasized.<\/jats:p>","DOI":"10.1002\/art.1780340502","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T18:40:41Z","timestamp":1171478441000},"page":"505-514","source":"Crossref","is-referenced-by-count":1593,"title":["The American College of Rheumatology criteria for the classification and reporting of osteoarthritis of the hip"],"prefix":"10.1002","volume":"34","author":[{"given":"R.","family":"Altman","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G.","family":"Alarc\u00f3n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Appelrouth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Bloch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Borenstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Brandt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Brown","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T. 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