question: Hi doctor I had Bilateral Release on my Left Knee around 2 years ago. Since then till now I m great but recently after a gym session I feel a slight shift in a ligament above my knee cap on the left knee. it almost feels like a small ball. It just feels weird for 2 seconds but their is no discomfort or pain what so ever. Im just curious to know it is. It only occurs when I fully bend the knee