Progressive valgus deformity of the donor-site ankle after extraperiosteal harvesting the fibular shaft in children. Treatment with osteotomy and synostosis at one session.

After extraperiosteal harvesting of the fibular shaft in children, progressive valgus deformity of the donor-site ankle may pose a serious problem. We present three illustrative case-histories: three children became functionally impaired and required surgery. Pathogenesis, natural history and surgical options are discussed. A supramalleolar osteotomy combined with a distal fibular-tibial synostosis is a good option to correct valgus and eliminate instability in one surgical session.