Hi, thanks for writing to HCM.
It is normal to have certain amount of stiffness
in the soft tissues around the ankle after a cast removal.
When these tight and stiff structures are subjected to stretch as in walking, one may experience pain, which is considered to be normal. This will settle down normally within a week. Prior to walking, do light stretching movements of the ankle and warm up the tissues. Applying hot fomentation will be helpful in making the soft tissues a bit supple.
You will feel comfortable within a week or two. Keep going.
Hope this information is helpful. Good day