The weather is cold and my ankles hurt.

The main reason is still related to your trauma. Trauma can lead to a decrease in blood circulation ability.

Furthermore, the ankles are at the far end of the body and are more sensitive to changes in blood circulation, so they will feel cold. In order to fundamentally solve this problem, it is recommended that you must perform some long-term, small-load aerobic exercise. If you persist, it will be very beneficial to improving blood circulation. Of course, you should also pay attention to keeping warm at the same time. It is good to eat more lean meat and soy products at ordinary times.

This should help you.