{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,26]],"date-time":"2026-05-26T05:05:59Z","timestamp":1779771959311,"version":"3.53.1"},"reference-count":12,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,5,26]],"date-time":"2026-05-26T00:00:00Z","timestamp":1779753600000},"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>Late proximal femoral fractures in long-term survivors with childhood tumor endoprostheses are rare and technically challenging. When the proximal femur lacks a usable medullary canal but the distal tumor prosthesis remains stable, reconstruction is difficult and total femoral replacement may be excessively invasive.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Case presentation<\/jats:title>\n                    <jats:p>A 28-year-old man with a history of distal femoral osteosarcoma treated in childhood with knee tumor prosthesis replacement presented after a fall with severe right hip pain and inability to bear weight. Imaging confirmed a displaced femoral neck fracture, while the distal prosthesis remained well fixed. To preserve the stable distal component, we performed a component-preserving reconstruction using a customized monoblock stem with a socket-type prosthesis-to-prosthesis coupling design. The construct was stabilized with vancomycin-loaded PMMA cement, locking screws, and a lateral anti-rotation plate, and a dual-mobility head was implanted. Postoperative radiographs showed satisfactory alignment and positioning. Limb-length discrepancy improved from approximately 20\u2005cm to 15\u2005cm. At 3 months, the Harris Hip Score was 63; at approximately 6 months, it improved to 81, with continued functional recovery.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This case suggests that customized component-preserving reconstruction may be a feasible alternative to total femoral replacement in selected patients with complex proximal femoral defects and retained stable distal tumor prostheses. Longer follow-up is needed to determine durability and late complications.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fsurg.2026.1819982","type":"journal-article","created":{"date-parts":[[2026,5,26]],"date-time":"2026-05-26T04:46:18Z","timestamp":1779770778000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Customized 3D-printed component-preserving reconstruction for femoral neck fracture revision in a long-term survivor of pediatric osteosarcoma: a case report"],"prefix":"10.3389","volume":"13","author":[{"given":"Zhiming","family":"Yu","sequence":"first","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qi","family":"Sun","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinyu","family":"Nan","sequence":"additional","affiliation":[{"name":"School of Nursing, Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Run","family":"Liu","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liuxin","family":"Yan","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Wang","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Lu","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaheng","family":"Zhao","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaocen","family":"Li","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lufeng","family":"Lin","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huiyang","family":"Jia","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changcheng","family":"Liu","sequence":"additional","affiliation":[{"name":"Hip Joint Center, The First Hospital of Hebei Medical University","place":["Shijiazhuang, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,5,26]]},"reference":[{"key":"B1","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1007\/978-1-4419-0284-9_1","article-title":"The epidemiology of osteosarcoma","volume-title":"Pediatric and Adolescent Osteosarcoma. 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