I was wondering how shall I describe one's foot, knee etc. which due to some injuries in sport has swollen and is filled with fluid. It is most of the time painful and can cause you feel uncomfortable. It usually restricts the range of motion. For more clarification, I have added an image to the post. Please have a look at it and let me know how shall I explain this injury in both everyday English and technical terms.
PS. As far as I am concerned, the term "edema" cannot be used in this case, while edema is not caused by an injury to a particular body tissue. (Please correct me if I am wrong.)