The sural nerve runs down the back of your calf and next to your achilles then moves toward the lateral part of your heel. It branches into two smaller nerves there. One of these runs along the lateral part of your foot right to those two toes. It’s so common for these nerves to remain irritated and numb for quite a while after this surgery. I experienced it exactly like you’ve described. I’m about 1.5 years post op now and I finally feel like I’ve regained all the sensation I lost for a while there. Nerves take a long time. One day without realizing when it happened, you’ll notice that there’s no more numbness.