Hello, Thanks for your query. Although these categories should be investigated and ruled out by your doctor. Therefore local trauma is most likely. Anything that impinges or damages a nerve could be responsible, ankle sprain. The strange thing about nerves is once damaged, healing may never be complete. So some people have a chronic symptom similar to yours after a crush injury that otherwise heals completely. You should visit an orthopaedic surgeon. I do hope that you have found something helpful and I will be glad to answer any further query. Take care