My left knee had an ACL repair about 13 years ago. Recently, I have felt a lot of pain and have had lumps on the back of my knee. I feel that now my pain has moved to the superior region of my calf muscle. First, I assumed it was a Baker s cyst, but now that the pain is in my calf, what are the chances that it s a blood clot? I don t have health insurance right now, so I don t want to go to the doctor unless I m going to die.