1727, from Japanese samurai warrior, knight, originally the military retainer of the daimio, variant of saburai, nominal form of sabura(h)u to be in attendance, to serve..
The bubbles make a noise when they burst. This is called cavitation. Another cause for painless popping in the knee is when the ligaments and tendons catch as they go over a bony lump and pop when they snap back into place. Or the clicking and popping may be caused by catching on soft tissue or scar tissue within the knee.
And remember, if your knee clicks but it doesnât cause you any pain, donât worry. It is usually entirely normal and nothing to worry about. You may find that strengthening your leg muscles actually eliminates the noise â see the strengthening exercises section for ideas on where to start.nee Popping with an Injury. If there is a loud pop at the time of injury it usually indicates a ligament injury. The two most common ligaments that produce knee pain and popping when they are injured are the ACL (Anterior Cruciate Ligament) and the MCL (Medial Collateral Ligament).