Sorry, I had previous titaniam screws and rods and cages removed. Two days later I had plastic cages from L1-S1 placed. then in April of this year, I had the screws removed that was placed last July. But, the numbness has been since the July 2007 fusion. Does this help any?
With no knowledge of what type of back surgery,there is little one could give you in ways of an accurate diagnosis.
Only thing you can do is carry on exercise which your doc told.It will take time.
Good luck!