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The average grip force values of each hand were evaluated and expressed as % of expected values, based on age- and sex-specific reference values. Linear regression analyses were used to assess the cross-sectional relation between the involvement of individual finger joints and grip force. In generalized estimating equations, the impact of time-varying synovitis\/tenderness on grip force over time was estimated. Analyses were adjusted for wrist involvement, erythrocyte sedimentation rate, and patient-reported pain.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>In 215 patients with early RA, grip force was 39% of expected at diagnosis, and increased to 56% after 5\u00a0years. Synovitis of the first metacarpophalangeal (MCP) joint (60% and 69% at baseline in the right and left hand) was associated with reduced grip force at inclusion (adjusted \u00df\u2009\u2212\u20099.2 percentage unit of expected grip force; 95% CI\u2009\u2212\u200913.6 to\u2009\u2212\u20094.8 for both hands combined) and at all follow-up evaluations. Synovitis of MCP I and MCP IV (12% at baseline) was significantly associated with reduced grip force over time in both hands. Proximal interphalangeal (PIP) joint swelling, and tenderness of MCP or PIP joints, had less impact on grip force.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>MCP I synovitis is the major contributor to reduced grip force in patients with early RA. This underlines the importance of the involvement of the thumb for impaired hand function in RA. MCP IV synovitis, but not PIP involvement or finger joint tenderness, also has a substantial impact on grip force.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13075-023-03212-6","type":"journal-article","created":{"date-parts":[[2023,11,30]],"date-time":"2023-11-30T08:02:28Z","timestamp":1701331348000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["The relation between synovitis of individual finger joints and grip force over the first 5\u00a0years in early rheumatoid arthritis \u2014 a cohort study"],"prefix":"10.1186","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9682-2070","authenticated-orcid":false,"given":"Maria","family":"Rydholm","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5891-548X","authenticated-orcid":false,"given":"Ankita","family":"Sharma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4402-148X","authenticated-orcid":false,"given":"Lennart","family":"Jacobsson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3805-2290","authenticated-orcid":false,"given":"Carl","family":"Turesson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,11,30]]},"reference":[{"key":"3212_CR1","doi-asserted-by":"publisher","first-page":"7004290030p1","DOI":"10.5014\/ajot.2016.017467","volume":"70","author":"JA Andrade","year":"2016","unstructured":"Andrade JA, Brand\u00e3o MB, Pinto MR, et al. 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