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Malunion often occurs following conservative treatment, but the microstructural characteristics of the malunited region remain poorly understood. This case report describes a rare instance of clavicular malunion identified in a 85-year-old male cadaver during a gross anatomy dissection course. Both clavicles were analyzed using radiography, micro-computed tomography (micro-CT), and histology to investigate the microstructural alterations associated with the malunion. Radiographically, the right clavicle demonstrated anterior\u2013posterior displacement and approximately 10% shortening compared with the intact side. Micro-CT analysis revealed decreased tissue mineral density, reduced trabecular bone volume, marked cortical thinning, and elevated structural indices, including the trabecular bone pattern factor and structure model index, suggesting a loss of trabecular connectivity and a transition from plate-like to rod-like architecture. Histological examination showed that the cortical bone at the fractured site exhibited a disorganized bone matrix lacking a lamellar structure, while the intact side displayed a well-organized lamellar pattern with regularly aligned osteocyte lacunae. These findings suggest that microstructural disorganization and decreased mineral density may contribute to reduced bone strength in the malunion region. Because high-resolution peripheral quantitative CT (HR-pQCT) cannot assess the clavicle, this cadaveric micro-CT and histological analysis provide valuable insights into the microstructural characteristics of clavicular malunion that are not accessible through conventional clinical imaging.<\/jats:p>","DOI":"10.1007\/s12565-026-00917-x","type":"journal-article","created":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T12:44:47Z","timestamp":1768999487000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Microstructural analysis of a malunited clavicular fracture in a human cadaver"],"prefix":"10.1007","author":[{"given":"Satoshi","family":"Inoue","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miwako","family":"Matsuki-Fukushima","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naoko","family":"Nonaka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,1,21]]},"reference":[{"key":"917_CR1","doi-asserted-by":"publisher","first-page":"e15","DOI":"10.1016\/j.jse.2012.01.019","volume":"22","author":"A Bachoura","year":"2013","unstructured":"Bachoura A, Deane AS, Wise JN, Kamineni S (2013) Clavicle morphometry revisited: a 3-dimensional study with relevance to operative fixation. 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