Ed “turns over” his ankle while playing tennis. He experiences swelling and pain, but after examination he is told that there are no torn ligaments and that the structure of the ankle is not affected....

Ed “turns over” his ankle while playing tennis. He experiences swelling and pain, but after examination he is told that there are no torn ligaments and that the structure of the ankle is not affected. On the basis of the signs and symptoms and the examination results, what do you think happened to Ed’s ankle?