Radiographically: If xrays or CT show good bone fomration and do not move on flexion and extension films, you are fused. If there is poor bone formation and/or movement on flexion and extension you are not fused. If you have no pain even without fusion which is possible then you do not need surgery for an unsuccessful fusion. You should consider revision sugary with unsuccessful fusion only if you have pain.
Answered 7/1/2016
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