The tibia is a long bone of the leg, the anterior third of which is just under the skin throughout most of its length. As only a thin layer of skin and subcutaneous tissue with no surrounding muscle covers it, it is vulnerable to injury, which often results in an exposed fracture. Due to its peculiar anatomy, delayed union, nonunion, infection, and osteomyelitis usually aggravate the spontaneous healing of wounds.
The reconstruction of partially comminuted fractures or small bone gaps (6 cm) requires vascularized bone grafts to overcome infection and restore bone continuity and blood supply. Usually, the external fixation device is removed after complete bone union is accomplished (generally 10 weeks). Full load-bearing capacity is recovered gradually, and it is recovered completely only after 4-6 months post-surgery.
You need to discuss all issues with your treating doctor, their advantages/disadvantages before taking a decision as he is best placed to advise you. It is not possible to comment on an individual case via mail without examining the patient.