I have been in an external fixator for a nonunion fracture of the distal shaft of my tibia for 8 months. i had a bone graft from my own femur end, but after 8 months the nonunion graft shows no new bone growth. what's next?

Assume you had bone around fracture that has not United by this description, and were placed on calcium, vit D mixture . There are implantable bone stimulators to consider, but please see a an endocrinologist to determine if you need bone stimulating hormones or treatment for osteoporosis. Good luck

Potential further treatment would include bone stimulator or perhaps vascularized bone graft which is live bone and much better fusion rates than regular bone graft. Would also be concerned about exfix for 8 months and potential for infection