{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T11:07:02Z","timestamp":1784027222837,"version":"3.55.0"},"reference-count":12,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T00:00:00Z","timestamp":1783987200000},"content-version":"vor","delay-in-days":13,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Chronic fragmented os trigonum fracture is an uncommon but clinically important cause of posterior ankle impingement that may be overlooked in active patients with persistent plantar-flexion-related posterior ankle pain. We report the case of a 31-year-old female physical education teacher with progressive right posterior ankle pain for over 1\u00a0year despite 3\u00a0months of conservative treatment. Radiographs and magnetic resonance imaging demonstrated a fragmented os trigonum with bone marrow edema and reactive inflammation. Posterior ankle endoscopy confirmed three osseous fragments, which were excised sequentially. Pain resolved within 3\u00a0weeks, light running resumed at 8\u00a0weeks, and full return to preinjury sports was achieved at 3\u00a0months. At 5-year follow-up, the patient remained asymptomatic with no recurrence and complete functional recovery. This case highlights the importance of considering this diagnosis in active patients with persistent posterior ankle pain and supports posterior ankle endoscopy as an effective treatment with durable results.<\/jats:p>","DOI":"10.1093\/jscr\/rjag577","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T10:50:34Z","timestamp":1784026234000},"source":"Crossref","is-referenced-by-count":0,"title":["Endoscopic excision for posterior ankle impingement secondary to chronic fragmented os trigonum fracture: a case report"],"prefix":"10.1093","volume":"2026","author":[{"given":"Thang Ngoc","family":"Pham","sequence":"first","affiliation":[{"name":"Orthopaedic Trauma Center, 103 Military Hospital, Vietnam Military Medical University , Ha Dong, Hanoi 100000 ,","place":["Vietnam"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anh The","family":"Nguyen","sequence":"additional","affiliation":[{"name":"Department of Surgery , Thai Nguyen University of Medicine and Pharmacy, Phan Dinh Phung, Thai Nguyen 250000 ,","place":["Vietnam"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anh Tuan","family":"Bui","sequence":"additional","affiliation":[{"name":"Orthopaedic Trauma Center, 103 Military Hospital, Vietnam Military Medical University , Ha Dong, Hanoi 100000 ,","place":["Vietnam"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,7,13]]},"reference":[{"key":"2026071406502512800_ref1","first-page":"572","article-title":"Posterior ankle impingement syndrome: a clinical review with reference to horizontal jump athletes","volume":"76","author":"Rogers","year":"2010","journal-title":"Acta Orthop Belg"},{"key":"2026071406502512800_ref2","doi-asserted-by":"publisher","first-page":"365","DOI":"10.5435\/00124635-200510000-00001","article-title":"Posterior ankle impingement syndrome","volume":"13","author":"Maquirriain","year":"2005","journal-title":"J Am Acad Orthop Surg"},{"key":"2026071406502512800_ref3","doi-asserted-by":"publisher","first-page":"1423","DOI":"10.12659\/msm.914485","article-title":"Implications of classification of os trigonum: a study based on computed tomography three-dimensional imaging","volume":"25","author":"Fu","year":"2019","journal-title":"Med Sci Monit"},{"key":"2026071406502512800_ref4","doi-asserted-by":"publisher","first-page":"279","DOI":"10.1016\/j.cpm.2020.12.011","article-title":"Os trigonum syndrome","volume":"38","author":"McAlister","year":"2021","journal-title":"Clin Podiatr Med Surg"},{"key":"2026071406502512800_ref5","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.fas.2014.08.006","article-title":"The management of posterior ankle impingement syndrome in sport: a review","volume":"21","author":"Ribbans","year":"2015","journal-title":"Foot Ankle Surg"},{"key":"2026071406502512800_ref6","first-page":"171","article-title":"Fracture of the non fused os trigonum, a rare cause of hindfoot pain. A case report and review of the literature","volume":"89","author":"Mouhsine","year":"2004","journal-title":"Chir Organi Mov"},{"key":"2026071406502512800_ref7","doi-asserted-by":"publisher","first-page":"354","DOI":"10.1177\/230949900601400326","article-title":"Fracture of the os trigonum: a case report","volume":"14","author":"Kose","year":"2006","journal-title":"J Orthop Surg (Hong Kong)"},{"key":"2026071406502512800_ref8","doi-asserted-by":"publisher","first-page":"139","DOI":"10.1007\/s10140-006-0536-2","article-title":"Acute fracture of the os trigonum","volume":"13","author":"Escobedo","year":"2006","journal-title":"Emerg Radiol"},{"key":"2026071406502512800_ref9","doi-asserted-by":"publisher","first-page":"871","DOI":"10.1053\/jars.2000.19430","article-title":"A 2-portal endoscopic approach for diagnosis and treatment of posterior ankle pathology","volume":"16","author":"Dijk","year":"2000","journal-title":"Arthroscopy"},{"key":"2026071406502512800_ref10","doi-asserted-by":"publisher","DOI":"10.1016\/j.fastrc.2022.100212","article-title":"Return to activity after excision of the symptomatic os trigonum: a systematic review comparing arthroscopic versus open excision","volume":"2","author":"Langer","year":"2022","journal-title":"Foot Ankle Surg Tech Rep Cases"},{"key":"2026071406502512800_ref11","doi-asserted-by":"publisher","first-page":"384","DOI":"10.1016\/j.arthro.2009.08.029","article-title":"Open versus endoscopic excision of a symptomatic os trigonum: a comparative study of 41 cases","volume":"26","author":"Guo","year":"2010","journal-title":"Arthroscopy"},{"key":"2026071406502512800_ref12","doi-asserted-by":"publisher","first-page":"S21","DOI":"10.1016\/j.jcot.2017.07.005","article-title":"Endoscopic management of posterior ankle impingement syndrome-a case report","volume":"8","author":"Kumar","year":"2017","journal-title":"J Clin Orthop Trauma"}],"container-title":["Journal of Surgical Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/academic.oup.com\/jscr\/article-pdf\/2026\/7\/rjag577\/68769738\/rjag577.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/academic.oup.com\/jscr\/article-pdf\/2026\/7\/rjag577\/68769738\/rjag577.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T10:50:35Z","timestamp":1784026235000},"score":1,"resource":{"primary":{"URL":"https:\/\/academic.oup.com\/jscr\/article\/doi\/10.1093\/jscr\/rjag577\/8733820"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,7]]},"references-count":12,"journal-issue":{"issue":"7","published-print":{"date-parts":[[2026,7,4]]}},"URL":"https:\/\/doi.org\/10.1093\/jscr\/rjag577","relation":{},"ISSN":["2042-8812"],"issn-type":[{"value":"2042-8812","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2026,7]]},"published":{"date-parts":[[2026,7]]},"article-number":"rjag577"}}