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.
This syndrome can lead to chondromalacia patella. If you have chondromalacia patella, youâll feel and hear a painful crunching and grating when you move your knee. Other knee injuries and types of arthritis can also cause crepitus. Treatment