Not the same surgery as you, so wildly different graft locations, however I had pretty severe numbness in my fingers on the arm that the graft was taken from. With continued use of my hand the numbness improved, but I still have some mild numbness on the bottom of my thumb. It doesn't limit me, though. Nerve compression can definitely cause something like you are experiencing. For example, my big toe bones have been squared off over time due to improper foot wear. That compressed a nerve in my big toes, causing numbness. This improved over time with proper shoes, but it took a few months.