I think there may be something wrong with my kneecap, most likely caused by a direct blow it probably got sometime in 2014. When I pedal on a bicycle, I can feel it sort of move...or kind of pop in and out of place. After biking for a little while, it gets sore. Also, when climbing up stairs, it makes an audible click. I ve looked online, and have considered a possible Patellar fracture or Patellar tracking disorder, however there is no actual pain or difficulty moving or bending my leg in any way. No pain. What could be the problem? Should I be worried?