I think you are on the right track to ask for a neurology consult. You may find out it will be a waiting game for the nerve to regenerate, or they may find a different problem, but in any case you'll have an answer. For what it's worth, my sister-in-law had 2 partial knee replacements, 8 weeks apart in 2019, and one was fine, but the other gave her nerve pain that persisted into the fall of 2020 - the neurologist tested & determined it will eventually heal. The pain is gone, but the doc says she may always have some numbness on that foot.
Sue