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In isolated reconstructions of the radius or ulna, the vascularized medial femoral condyle (MFC) flap has gained popularity, achieving 98\u2013100% union rate. Allogenic bone grafts have also been described for reconstruction of large bone defects, potentially reducing donor site morbidity and operation time.This two-case report investigates the performance of vascularized MFC cortico-cancellous flap for ulna reconstruction and tricortical allogenic bone graft of the iliac crest for radius reconstruction in excessive, post-traumatic, atrophic non-union of the forearm diaphysis. In May and June 2021, a 62-year-old and a 56-year-old male received reconstruction surgery 9 and 13 months after initial plate osteosynthesis after a motorcycle accident. The MFC flap showed successful bony union of the ulna after 3 months as well as consecutive remodeling. However, the reconstruction of the radius showed a recurrent non-union, which even led to plate breakage in one case.In both cases, ulnar reconstruction with a vascularized MFC flap achieved successful union. However, radial reconstruction using structural allograft did not achieve union, causing recurrent non-union, likely reflecting limited biological incorporation.Level of Evidence: V (Therapeutic)<\/jats:p>","DOI":"10.2340\/jphs.v61.45795","type":"journal-article","created":{"date-parts":[[2026,4,24]],"date-time":"2026-04-24T14:38:36Z","timestamp":1777041516000},"page":"91-94","source":"Crossref","is-referenced-by-count":0,"title":["Medial femoral condyle flap for ulnar reconstruction and structural bone allograft for radial reconstruction in post-traumatic forearm diaphyseal non-union: a two-case report"],"prefix":"10.2340","volume":"61","author":[{"given":"Matthias","family":"Holzbauer","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maximilian","family":"Zaussinger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Klaus","family":"Strassmair","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefan M.","family":"Froschauer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tobias","family":"Gotterbarm","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manfred","family":"Schmidt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1183","published-online":{"date-parts":[[2026,4,24]]},"reference":[{"key":"152711","doi-asserted-by":"crossref","unstructured":"Srinivasan RC, Hutson RL, Richard MJ. 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