Hi! Yesterday I landed directly on my knee cap while playing softball. I was able to walk off without an issue and I applied ice right away. I kept it elevated and straight to help with swelling. Due to my concern, I went to the hospital after the game. They took X-rays and nothing was wrong. No sign of broken bones or even blood filling the joint, which was a sign of any tear in a ligament. No bruising has occurred at all. The doctor then twisted my leg two ways, pushed it, and pulled it and nothing hurt. She said I just had a nasty fall and to stay off the rest of the day, elevate and ice. So I went to bed and I woke up and could barely move the joint, stiff as a board. My sister is a PT and so she said to prevent any stiffness and to decrease swelling, I had to do easy knee exercises to keep mobility and to walk a good bit. It feel much better but now my knee feels kind of loose and unstable. However, she said it may be due to the swelling. Suggestions? Should I go back to the doctors for an MRI? They tested me and checked for signs but said I should be perfectly fine