I was travelling in a bus. Driver applied a break, I didn't even move from the position, but I heard a sound from my right knee - "clukk". Next days onwards the pain started. I had been to physician, he said there might be a ligament tear...advised on tablets. But no use, then had advised me to wear knee cap for few days. I was feeling better with knee cap. I removed it after 25 days, it was little better for 2 days, then again the pain is back.