Management of Distal Femur Deformity Following Ablation of Aneurysmal Bone Cyst, by Corrective Osteotomy and Elongation

An adolescent healthy male presented with a left distal femur aneurysmal bone cyst (ABC). The patient’s ABC was managed with evacuation, cryo-ablation, sclerotherapy, and synthetic bone substitute. The patient developed medial distal growth plate arrest leading to a limb length discrepancy and a varus deformation. Two stages were used to treat the deformity: a complete epiphysiodesis of the distal femur and valgus osteotomy, followed by bone elongation on a telescoping nail at a more proximal site. The process was performed over two stages in order to achieve accurate, precise, and controlled correction on healthy bone only (away from the pathologic bone).