Avulsion fracture of the tibial eminence is rare in children. This report describes a case of a 9-year-old boy who had been treated previously with an epiphyseal cannulated screw and washer, but without notchplasty, for an avulsion fracture of the tibial eminence. The patient subsequently presented with extension block and knee stiffness. After removal of the implants and manipulation, an iatrogenically-induced distal femur fracture was observed postoperatively with callus formation noted at follow-up. This case serves to illustrate the importance of identifying and treating screw head impingement during fixation surgery, of avoiding vigorous manipulation during removal of fixation devices, and of consulting radiographs after any manipulation.