{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T12:10:13Z","timestamp":1789992613394,"version":"4.0.1"},"reference-count":34,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Journal of Back and Musculoskeletal Rehabilitation"],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Self-report questionnaires are commonly used to assess functional status in patients with ankylosing spondylitis (AS). However, these instruments may not fully reflect patients\u2019 actual physical performance. The Back Performance Scale (BPS-TR) may provide a more objective, performance-based approach to evaluating functional limitations. This study aimed to investigate the psychometric properties of the BPS-TR in patients with AS.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      A total of 107 patients with AS were included. Functional performance was assessed using five standardized tasks: sock, pick-up, roll-up, fingertip-to-floor, and lifting tests. Convergent validity was examined using BASFI, BASDAI, ASQoL, and BASMI. Test\u2013retest reliability was evaluated in 40 patients after a one-week interval using the intraclass correlation coefficient [ICC\n                      <jats:sub>2,1<\/jats:sub>\n                      ].\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The BPS-TR demonstrated excellent test\u2013retest reliability [ICC\n                      <jats:sub>2,1<\/jats:sub>\n                      \u2009=\u20090.890] and acceptable internal consistency (Cronbach's \u03b1\u2009=\u20090.787). Measurement error was small (SEM = 0.53; MDC\n                      <jats:sub>95<\/jats:sub>\n                      \u2009=\u20091.47). Significant moderate correlations were found with BASFI (r\u2009=\u20090.654), ASQoL (r\u2009=\u20090.590), BASDAI (r\u2009=\u20090.615), and BASMI (r\u2009=\u20090.630) (all p\u2009&lt;\u20090.001). Exploratory factor analysis supported a unidimensional structure explaining 62.4% of the total variance.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The BPS-TR is a valid, reliable, and practical performance-based scale for assessing functional limitations in patients with AS. Its use alongside self-report questionnaires may contribute to a more comprehensive evaluation of functional status in clinical practice.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/10538127261489868","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T13:58:53Z","timestamp":1789739933000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Performance-based functional assessment in ankylosing spondylitis: Clinical utility and validation of the Back Performance Scale (BPS-TR)"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3450-2490","authenticated-orcid":false,"given":"Gokhan","family":"Maras","sequence":"first","affiliation":[{"name":"Department of Physiotherapy and Rehabilitation, Kulu Faculty of Health Sciences, Sel\u00e7uk University, Konya, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4861-3204","authenticated-orcid":false,"given":"Gamze Gulsun","family":"Pala","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy and Rehabilitation, Amasya University, Amasya, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Belma","family":"Degerli Maras","sequence":"additional","affiliation":[{"name":"Department of Family Medicine, University of Health Sciences, Atat\u00fcrk Sanatorium Training and Research Hospital, Ankara, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,9,18]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00586-025-08856-3"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1186\/s12891-024-07613-9"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jare.2012.01.002"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1093\/rheumatology\/key079"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.2298\/SARH0910524M"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.55730\/1300-0144.5516"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1093\/ptj\/82.12.1213"},{"key":"e_1_3_2_9_2","first-page":"818","article-title":"Comparison between self-report measures and clinical observations of functional disability in ankylosing spondylitis, rheumatoid arthritis and fibromyalgia","volume":"21","author":"Hidding A","year":"1994","unstructured":"Hidding A, Van Santen M, De Klerk E, et al. Comparison between self-report measures and clinical observations of functional disability in ankylosing spondylitis, rheumatoid arthritis and fibromyalgia. J Rheumatol 1994; 21: 818\u2013823.","journal-title":"J Rheumatol"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-198303000-00004"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1590\/1806-9282.20230927"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1097\/BRS.0000000000002771"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-200404150-00017"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphys.2017.07.004"},{"key":"e_1_3_2_15_2","first-page":"2281","article-title":"A new approach to defining functional ability in ankylosing spondylitis: the development of the Bath Ankylosing Spondylitis Functional Index","volume":"21","author":"Calin A","year":"1994","unstructured":"Calin A, Garrett S, Whitelock H, et al. 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