We present the case of a 31-year-old female with a history of juvenile rheumatoid arthritis and uveitis who presented to our department with a leg-length discrepancy and low back pain refractory to conservative management. She underwent a shortening osteotomy on her left femur around an intramedullary nail that went on to nonunion. She underwent exchange nailing with a magnetic intramedullary nailing with autologous bone graft harvest from her affected femoral reamings. The magnetic intramedullary nail was extended 2 cm prior to insertion, and then implanted in the usual fashion with immediate compression in the operating room. Postoperatively the patient underwent a compressive program using the magnetic nail and went on to heal her osteotomy site.