Case ReportsCongenital Fibular Deficiency: Total Knee Arthroplasty with Extraarticular Deformity A Case ReportVedoya, Santiago P. MD1,a; Viale, Germán MD1; Gessara, Alan MD1; del Sel, Hernán MD1 Author Information 1Buenos Aires British Hospital, Buenos Aires, Argentina aE-mail address for S.P. Vedoya: [email protected] Investigation performed at Buenos Aires British Hospital, Buenos Aires, Argentina Disclosure: The Disclosure of Potential Conflicts of Interest forms are provided with the online version of the article (https://links.lww.com/JBJSCC/B412). JBJS Case Connector 11(2):e20.00590, April-June 2021. | DOI: 10.2106/JBJS.CC.20.00590 Buy Associated Video Metrics Abstract Case: A total knee arthroplasty (TKA) was performed on a 35-year-old man with congenital fibular deficiency and a 20° varus and 28° antecurvatum tibial deformity of the left lower limb. Conclusion: One-stage TKA and correction of the extraarticular deformity by means of intraarticular bone resections and a standard soft tissue release were performed to restore the limb's mechanical axis. Patients with congenital fibular deficiency present a wide range of limb deformities because of bone deficiencies or treatment sequels, which might require a specific surgical technique and small-sized implants to obtain good results during a TKA. Copyright © 2021 by The Journal of Bone and Joint Surgery, Incorporated