{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T13:50:42Z","timestamp":1790776242941,"version":"4.1.0"},"reference-count":86,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T00:00:00Z","timestamp":1773878400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medical Sciences"],"abstract":"<jats:p>Rigid internal fixation has long been the standard for fracture management; however, excessive construct stiffness can suppress interfragmentary strain, reduce callus formation, and impair secondary fracture healing. Low-elastic-modulus TiNbSn alloys have emerged as a promising alternative, offering mechanical behavior closer to that of cortical bone. This review synthesizes representative preclinical and computational evidence to clarify the mechanobiological rationale for TiNbSn alloy plates in fracture fixation. We summarize key biological requirements for secondary fracture healing, including controlled interfragmentary strain, preservation of vascularity, and effective load sharing, and contrast these with the limitations of conventional high-stiffness fixation plates, such as stress shielding and reduced callus formation. Finite element analyses from previously reported models illustrate qualitative trends toward increased axial displacement, favorable stress distribution, and within a biologically relevant range for endochondral ossification. Consistent findings from animal fracture models further indicate enhanced periosteal and intramedullary callus formation and more physiological healing patterns with TiNbSn plates compared with rigid fixation. Emerging clinical experience with TiNbSn femoral stems provides indirect support for the long-term potential of low-elastic-modulus titanium alloys to mitigate stress shielding; however, such findings should be interpreted only as indirect supportive evidence, as stem implantation and fracture plate fixation involve substantially different mechanical and biological contexts. Collectively, these observations provide preliminary support for the mechanobiological rationale of low-modulus TiNbSn plates and suggest their potential role as biologically informed fixation devices, while highlighting the need for further clinical validation.<\/jats:p>","DOI":"10.3390\/medsci14010149","type":"journal-article","created":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T15:38:01Z","timestamp":1773934681000},"page":"149","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Mechanobiological Implications of Low\u2013Young\u2019s Modulus TiNbSn Alloy Plates for Fracture Fixation: A Focused Review"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8225-4690","authenticated-orcid":false,"given":"Yu","family":"Mori","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8679-9121","authenticated-orcid":false,"given":"Hidetatsu","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4451-2967","authenticated-orcid":false,"given":"Masayuki","family":"Kamimura","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8700-9731","authenticated-orcid":false,"given":"Naoko","family":"Mori","sequence":"additional","affiliation":[{"name":"Department of Radiology, Akita University Graduate School of Medicine, Akita 010-8543, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1571-5618","authenticated-orcid":false,"given":"Toshimi","family":"Aizawa","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1093","DOI":"10.1302\/0301-620X.84B8.0841093","article-title":"Evolution of the internal fixation of long bone fractures. 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