If you had thr using the posterior method, the nerve damage in your foot is caused by your feet being strapped top down to the op table, forcing your foot straight out in an unnatural position stretching the nerves for a relatively long period of time. You are under sedation and cannot complain or do as you would naturally if you were only asleep and reposition your foot when it starts to hurt. Both of my feet were damaged in this manner by being under for over 14 hours having open heart surgery. Although I was right side up during that surgery, I still had tens of pounds of war blankets pressing down on my feet for over 14 hours with nobody paying attention to the damage being done to my feet hidden under all these covers for such a long time. After 6 years, my feet were just starting to feel close to normal when I has THA that caused a little on the numbness and pain to return to the operated side, and the non-operated side was even worse than 6 years ago! Evidently they keep your non-op foot tied down the entire time you are out, but release the operated side during part of the time they are working on you. It is easy to tell if this happened to you because your non-op foot will be the one causing most all the problems and the operated side will be much better in relation to it.
If you has the anterior minimal invasive approach, the reaso will most like be as described by the other fellow.
The real problem is that you are not being car o as you should be while you are under and unable to care for yourself. I strongly believe a person should be in the operating room at all times while you are out trained in care for someone under and not able to care for himself. That person should be trained in nerve damage problems caused by you yourself not being able to do this yourself.
i