Complete Consolidation after a long history of failed treatment. Valgus deformity of the humerus after failed earlier treatment of juvenile bone cyst with Elastic stable intramedullary Nails and a different artificial bone substitute. After 3 years of failed treatment the result was classified as Capanna Grade 4. During removal of the nails and the combined treatment with ESIN-osteosynthesis, Orthoss® and GPS® an additional external fixation was needed due to instability. The Fixateur was removed after 4 weeks, the nails after 6 months.