{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T12:45:17Z","timestamp":1782909917963,"version":"3.54.5"},"reference-count":0,"publisher":"MJS Publishing, Medical Journals Sweden AB","license":[{"start":{"date-parts":[[2022,6,14]],"date-time":"2022-06-14T00:00:00Z","timestamp":1655164800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ActaO"],"abstract":"<jats:p>Background and purpose: In younger patients with a femoral neck fracture (FNF), internal fixation is the recommended treatment regardless of displacement. Healing complications are often treated with arthroplasty. We determined the rate of conversion to arthroplasty up to 5 years after fixation of either undisplaced FNFs (uFNFs) or displaced FNFs (dFNFs).Patients and methods: The study was based on prospectively collected data from the Swedish Fracture Register (SFR) and the Swedish Arthroplasty Register (SAR). FNFs in patients aged &lt; 60 treated with parallel pins\/screws or sliding hip screws (SHS) registered in SFR 2012\u20132018 were cross-referenced with conversions to arthroplasty registered in SAR until 2019. The cumulative conversion and mortality rates were determined by Kaplan\u2013Meier analyses and patient- and surgery-dependent risk factors for conversion by Cox regression analyses.Results: We included 407 uFNFs and 389 dFNFs (median age 52, 59% men). The 1-year conversion rate was 3% (95% CI 1\u20135) for uFNFs and 9% (CI 6\u201312) for dFNFs. Corresponding results at 5 years were 8% (CI 5\u201311) and 25% (CI 20\u201330). Besides a displaced fracture, age 50\u201359 was associated with an increased rate of conversion in uFNFs. This older group also had a higher mortality rate, compared with patients aged &lt; 50. There was no sex difference for mortality.Interpretation: Adults aged under 60 with uFNFs and dFNFs face an 8\u201325% risk, respectively, of conversion to arthroplasty within 5 years after internal fixation. This is new and pertinent information for surgeons as well as patients.<\/jats:p>","DOI":"10.2340\/17453674.2022.3038","type":"journal-article","created":{"date-parts":[[2022,6,14]],"date-time":"2022-06-14T15:50:37Z","timestamp":1655221837000},"page":"547-553","source":"Crossref","is-referenced-by-count":9,"title":["Rate of conversion to secondary arthroplasty after femoral neck fractures in 796 younger patients treated with internal fixation: a Swedish national register-based study"],"prefix":"10.2340","volume":"93","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0762-9691","authenticated-orcid":false,"given":"Sebastian Str\u00f8m","family":"R\u00f6nnquist","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1646-0733","authenticated-orcid":false,"given":"Johan","family":"Lagergren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5169-4282","authenticated-orcid":false,"given":"Bjarke","family":"Viberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"M\u00f6ller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6556-4320","authenticated-orcid":false,"given":"Cecilia","family":"Rogmark","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1183","published-online":{"date-parts":[[2022,6,14]]},"container-title":["Acta Orthopaedica"],"original-title":[],"link":[{"URL":"https:\/\/actaorthop.org\/actao\/article\/download\/3038\/5369","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/actaorthop.org\/actao\/article\/download\/3038\/5369","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,12,19]],"date-time":"2024-12-19T01:53:04Z","timestamp":1734573184000},"score":1,"resource":{"primary":{"URL":"https:\/\/actaorthop.org\/actao\/article\/view\/3038"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,6,14]]},"references-count":0,"URL":"https:\/\/doi.org\/10.2340\/17453674.2022.3038","relation":{},"ISSN":["1745-3682","1745-3674"],"issn-type":[{"value":"1745-3682","type":"electronic"},{"value":"1745-3674","type":"print"}],"subject":[],"published":{"date-parts":[[2022,6,14]]}}}