Atlantoaxial Instability and C1 C2 Fusion 25 year old female complained of Neck Pain with tingling along neck and upper limbs . She also had difficult in walking and urinary frequency. Her MRI showed signal change at C1 level without any significant compression. Dynamic Xrays showed C1 C2 instabilty with increased AAI on flexion. In view instability and symptoms, patient was Planned for C1 C2 fusion with Transarticular Screws from posterior approach. Surgery was uneventful with fusion at 3 months.