I am not too sure but this may be a different case from most on this forum but I initially was not fused low enough (my initial fusion was T11-L3, and my scoliotic cobb angle goes down to L4) but the surgeon I believe wanted to saviour some mobility and flexibility within my spine. And only fused me to L3. I know this isn't really 'wrong level' but wanted to add that in
Lyssie