I injured my knee approx. 8 days ago falling off a ladder. Yesterday I was able to obtain a small knee brace, but removed it after about 2 hrs, when I noticed severe bruises on the back of my lower thigh just above the knee, where the brace had been. Then, just about an hr ago, I began to experience a sudden and pronounced swelling of my left foot, the same one connected to the knee. I am not anemic, in my early 40's and have had decent bloodwork analysis done within the last month, and my hemo is good, my counts and pressure and all of it was in the green. What is potentially causing the swelling of the foot below the injured knee all of a sudden? Could I have thrown a clot?