Question: I fell hard on tree roots, directly onto my knees, about 10 days ago. The right knee showed a big bruise, but the left did not show any bruising at all. However, the outside of my left knee felt exactly like it had a bruise when touched. Both knees hurt extremely badly when kneeling on them to get into bed.
Just a few days ago, I touched a mop bucket with my left knee to move the bucket. I didn't push, or bang it hard, just enough pressure to move the bucket which was on wheels. The contact line with the bucket was directly in the middle of my knee cap.
Immediately my knee hurt really badly, only this time with a very strong burning sensation, and exactly where the mop bucket edge came in contact with my knee.
Now, a few days later, I still feel that same burning sensation when I press the middle of my knee cap with light pressure. I also still feel the bruise feeling when I touch the outside of my left knee. The bruise on the right knee feels much better, but still tender even when just softly. I don't feel any pain when standing or walking though.
The worst is when I get down to the floor on my knees, and I lean back so that I am sitting on my feet. The pain is unbearable, and I have to come back to a kneeling position. This position is still uncomfortable, but it is much better than when I was sitting on my feet.
Could anyone tell me what they think might be going on under the skin? I find it weird that my left knee feels bruised, but shows no sign of bruising.

Thank you for your response. Is this something that in time may heal on it's own? To get an Mri will cost me $200. Is there anything I can do at home that could help the healing process?