{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T23:37:13Z","timestamp":1785541033926,"version":"3.56.0"},"reference-count":34,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T00:00:00Z","timestamp":1785456000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Surg."],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Post-traumatic coxa vara following femoral neck or intertrochanteric fracture nonunion or malunion remains a difficult problem in young and middle-aged patients, in whom salvage total hip arthroplasty carries excess complication risk. Proximal femoral valgus osteotomy is a joint-preserving alternative, but evidence supporting fixation with a dynamic hip screw (DHS) is limited, and is largely confined to younger cohorts.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Case summary<\/jats:title>\n                    <jats:p>\n                      We report a single-center, retrospective, consecutive case series of twelve patients (seven men, five women; mean age 52.2\u2009\u00b1\u200920.0 years, range 20\u201373) treated between January 2020 and December 2024. Etiologies included failed internal fixation of intertrochanteric fracture (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20096), malunion of intertrochanteric fracture (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20093), failed internal fixation of femoral neck fracture (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20092), and malunion of femoral neck fracture (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20091). All patients underwent proximal femoral valgus osteotomy with DHS-based fixation, supplemented as required by cannulated screws or a reconstruction plate. Outcomes were assessed at a minimum follow-up of 12 months.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Outcomes<\/jats:title>\n                    <jats:p>\n                      Bony union was achieved in all twelve patients at a mean of 19.1\u2009\u00b1\u20094.1 weeks. The mean neck\u2013shaft angle improved from 100.3\u00b0 to 132.2\u00b0, the mean Harris Hip Score from 50.4 to 80.2, and the mean limb shortening reduced from 2.4\u2005cm to 0.7\u2005cm (all\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&amp;lt;\u20090.001). No avascular necrosis, implant failure, clinically significant heterotopic ossification, or conversion to arthroplasty occurred.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Proximal femoral valgus osteotomy with DHS-based fixation reliably restores hip mechanics, achieves union, and produces meaningful functional improvement in post-traumatic coxa vara, including in selected older patients with a viable femoral head.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fsurg.2026.1885633","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T20:44:33Z","timestamp":1785530673000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Case Report: Proximal femoral valgus osteotomy and dynamic hip screw fixation for post-traumatic coxa vara secondary to femoral neck or intertrochanteric fracture nonunion or malunion: a retrospective case series"],"prefix":"10.3389","volume":"13","author":[{"given":"Mingyang","family":"Cao","sequence":"first","affiliation":[{"name":"Department of Trauma Center, Zhoukou Orthopedic Hospital","place":["Henan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Trauma Center, Zhoukou Orthopedic Hospital","place":["Henan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyu","family":"Gao","sequence":"additional","affiliation":[{"name":"Department of Trauma Center, Zhoukou Orthopedic Hospital","place":["Henan, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,7,31]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1064","DOI":"10.1002\/jbmr.4821","article-title":"Global epidemiology of hip fractures: secular trends in incidence rate, post-fracture treatment, and all-cause mortality","volume":"38","author":"Sing","year":"2023","journal-title":"J Bone Miner Res"},{"key":"B2","doi-asserted-by":"publisher","first-page":"2239","DOI":"10.1007\/s00198-012-1964-3","article-title":"A systematic review of hip fracture incidence and probability of fracture worldwide","volume":"23","author":"Kanis","year":"2012","journal-title":"Osteoporos Int"},{"key":"B3","doi-asserted-by":"publisher","first-page":"15","DOI":"10.2106\/00004623-199401000-00003","article-title":"Outcomes after displaced fractures of the femoral neck. 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