{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T12:34:54Z","timestamp":1768307694814,"version":"3.49.0"},"reference-count":43,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T00:00:00Z","timestamp":1768262400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100014137","name":"Shanghai Shenkang Hospital Development Center","doi-asserted-by":"publisher","award":["SHDC12025145"],"award-info":[{"award-number":["SHDC12025145"]}],"id":[{"id":"10.13039\/501100014137","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["6250072766"],"award-info":[{"award-number":["6250072766"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100017950","name":"Shanghai Municipal Health Commission","doi-asserted-by":"publisher","award":["2025GKQ33"],"award-info":[{"award-number":["2025GKQ33"]}],"id":[{"id":"10.13039\/100017950","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Surg."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>This study compared implant-related complications after femoral neck fracture fixation using partially vs. fully threaded cannulated screws in non-geriatric patients.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This retrospective cohort study included 1,035 patients with femoral neck fractures aged 18\u201360 years treated with cannulated screws from 2012 to 2022. Patients were followed until clinical failure\u2014defined as the occurrence of any of the following: implant cut-out, femoral neck shortening, nonunion, or avascular necrosis\u2014or for a minimum of 2 years. Patients were categorized into two groups according to thread type and balanced using propensity score matching. The primary outcome was the clinical failure rate. Subgroup analyses were performed for comminuted vs. non-comminuted fractures.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The overall clinical failure rate was 35.4%, including implant cut-out (1.9%), femoral neck shortening (15.0%), nonunion (9.3%) and avascular necrosis (23.5%); this rate was significantly higher for those with comminuted fractures. After balancing covariates, the partially threaded group demonstrated higher rates of femoral neck shortening (13.7% vs. 6%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.017) and avascular necrosis (17.9% vs. 9.5%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.027) than the fully threaded group in the overall cohort. In the non-comminuted subgroup, the partially threaded group was associated with significantly lower rates of implant cut-out (0% vs. 8.7%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&amp;lt;\u20090.01) than the fully threaded group. However, in the comminuted fracture subgroup, the fully threaded group exhibited significantly lower incidences of femoral neck shortening (6.6% vs. 22.4%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&amp;lt;\u20090.01) and avascular necrosis (10.5% vs. 36.2%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&amp;lt;\u20090.01).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Fracture comminution increases the risk of femoral neck shortening and avascular necrosis. In non-comminuted fractures, the use of partially threaded screws should be prioritized. However, in comminuted fractures, using fully threaded screws decreases rates of femoral neck shortening and avascular necrosis. This study provides evidence to guide cannulated screw thread type selection for comminuted fractures and paves the way for future randomized controlled trials.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fsurg.2025.1745105","type":"journal-article","created":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T06:30:44Z","timestamp":1768285844000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of screw thread type on implant-related complications following femoral neck fracture fixation in non-geriatric adults: a multicenter, retrospective cohort study"],"prefix":"10.3389","volume":"12","author":[{"given":"Yuquan","family":"Bian","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kai","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sen","family":"Lin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shizan","family":"He","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dajun","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weitao","family":"Jia","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2026,1,13]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"3408","DOI":"10.1016\/j.injury.2021.07.014","article-title":"Long-term differences in clinical prognosis between crossed- and parallel-cannulated screw fixation in vertical femoral neck fractures of non-geriatric patients","volume":"52","author":"Jiang","year":"2021","journal-title":"Injury"},{"key":"B2","doi-asserted-by":"publisher","first-page":"271","DOI":"10.1097\/BOT.0000000000002355","article-title":"Treatment failure in femoral neck fractures in adults less than 50 years of age: analysis of 492 patients repaired at 26 North American trauma centers","volume":"36","author":"Collinge","year":"2022","journal-title":"J Orthop Trauma"},{"key":"B3","doi-asserted-by":"publisher","first-page":"473","DOI":"10.1186\/s13018-021-02619-8","article-title":"Enhanced interfragmentary stability and improved clinical prognosis with use of the off-axis screw technique to treat vertical femoral neck fractures in nongeriatric patients","volume":"16","author":"Jiang","year":"2021","journal-title":"J Orthop Surg Res"},{"key":"B4","doi-asserted-by":"publisher","first-page":"3195","DOI":"10.1016\/j.arth.2020.06.003","article-title":"Displaced femoral neck fractures in workers\u2019 compensation patients aged 45\u201365 years: is it best to fix the fracture or replace the joint?","volume":"35","author":"Anderson","year":"2020","journal-title":"J Arthroplasty"},{"key":"B5","doi-asserted-by":"publisher","first-page":"2199","DOI":"10.1056\/NEJMoa1906190","article-title":"Total hip arthroplasty or hemiarthroplasty for hip fracture","volume":"381","author":"Bhandari","year":"2019","journal-title":"N Engl J Med"},{"key":"B6","doi-asserted-by":"publisher","first-page":"946","DOI":"10.1001\/jama.2019.12964","article-title":"Effect of a multicomponent home-based physical therapy intervention on ambulation after hip fracture in older adults: the CAP randomized clinical trial","volume":"322","author":"Magaziner","year":"2019","journal-title":"Jama"},{"key":"B7","doi-asserted-by":"publisher","first-page":"e221","DOI":"10.1097\/BOT.0000000000000080","article-title":"Preoperative decision making in the treatment of high-angle \u201cvertical\u201d femoral neck fractures in young adult patients. 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