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.
as the patient lies supine with one knee fully flexed, the examiner rotates the patient's foot fully outward and the knee is slowly extended; a painful âclickâ indicates a tear of the medial meniscus of the knee joint; if the click occurs when the foot is rotated inward, the tear is in the lateral meniscus.1  Facebook.s the patient lies supine with one knee fully flexed, the examiner rotates the patient's foot fully outward and the knee is slowly extended; a painful âclickâ indicates a tear of the medial meniscus of the knee joint; if the click occurs when the foot is rotated inward, the tear is in the lateral meniscus. 1  Facebook.