Adolescent Blount’s Disease Treated with MAC External Fixation System

This case describes a 13 year old female with adolescent Blount’s disease of the left leg. Blount’s disease causes genu varum and internal tibial torsion. Treatment options are numerous, including nonoperative or operative management depending on the specific clinical presentation and whether there are any relative indications to choose surgery over a nonoperative course. The treatment undergone in this case included a left tibia and fibula osteotomy with application of Biomet Multi-Axial Correction (MAC) External Fixation System with six bone screws and, through separate incisions, anterior and lateral compartment release as prophylactic fasciotomies. Our operative strategy with the MAC external fixator has been well described for patients with Blount’s disease. The use of the MAC external fixator allows for gradual correction and adjustment of angular deformity and displacement in all three planes, including correction of residual or secondary deformities that occur during lengthening. The fixator can correct lower extremity deformities, including Blount’s disease, and allows the possibility of anatomic alignment within normal radiographic limits.Adolescent Blount’s disease