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We examined 248 thumbs from 127 participants who were asymptomatic for hand disorders and had no history of hand injury. Boutonni\u00e8re deformity was identified in 20 thumbs of 17 participants and was significantly more prevalent among elderly participants than among young participants. No significant differences in sex or hand dominance were noted. The deformity had a significant effect on range of motion and grip and pinch strengths. The extensor pollicis brevis (EPB) tendon was significantly narrower in affected thumbs than in non-affected thumbs. The prevalence of boutonni\u00e8re deformity without rheumatoid arthritis or trauma was 13%, and the deformity was associated with advanced age and a narrow EPB tendon.<\/jats:p>\n                  <jats:p>Level of evidence: III<\/jats:p>","DOI":"10.1177\/1753193417704610","type":"journal-article","created":{"date-parts":[[2017,5,2]],"date-time":"2017-05-02T07:46:55Z","timestamp":1493711215000},"page":"324-330","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Thumb boutonni\u00e8re deformity without rheumatoid arthritis or trauma"],"prefix":"10.1177","volume":"43","author":[{"given":"T.","family":"Hara","sequence":"first","affiliation":[{"name":"Department of Hand Surgery, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"H.","family":"Yoneda","sequence":"additional","affiliation":[{"name":"Department of Hand Surgery, 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