Revision of Femur Fassier-Duval Rod for Intertrochanteric Fracture Nonunion with Lytic Cyst and Coxa Vara in Osteogenesis Imperfecta Patient

This is a case of Fassier-Duval (FD) rodding used in revision fixation for a 5-year-old boy with osteogenesis imperfect (OI) type IV who presented with intertrochanteric fracture non-union with cyst development. Deformities of the right femur were corrected with other bone deformities at age 2 years using osteotomy and insertion of FD rod. A fracture non-union with cyst formation at the intertrochanteric area developed at age 4 years with accompanied with coxa vara. This was addressed by corrective osteotomy, rod exchange, and fixation of the proximal femur with K-wires and cerclage. This case presents a complex clinical scenario; it highlights the challenges of managing non-union in the context of OI and can further our understanding of its associated complications.