A couple of months ago, I hurt my knees when I kneeled down on a cement floor. I let it heal for a couple of days, and then I went back to my normal schedule. Well, the injury compounded and now I have pain in my knee joints when I land a jump or do squats. The pain feels as if it is between the upper and lower parts of the joints, but the sharpest pain (which is actually dull in comparison to a cut or pinch) is on the very top of the tibia. I don't have any popping or restraint when I bend my knees, so I don't think that it is a meniscal tear or a damaged ligament. I also don't see any inflammation, but I'm still open to suggestions. I put an Ace knee brace on the left knee (which is the worst of the two) about a week ago, and started using ibuprofen for the pain and possible inflammation. What kind of injury do I have, and what more can I do to help it heal? If it continues, I'll go to a doctor, but until then, what kind of exercises can I do that won't worsen the injury? (I'm already doing the usual pushups, situps, and pullups and a bit of flexibility that won't cause my knees to bend too far with weight on them.)