Grinding or crunching are common symptoms of cartilage problems. If the cartilage is damaged -- a condition called chondromalacia -- a crunching sensation is often felt by placing the hand over the kneecap and bending the knee. A similar grinding sensation may be felt with knee arthritis.
Don't get confused by the name. It was just the civil code that Napoleon Bonaparte established in France. What was significant about it was that it replaced the feudal system, the major governing system since the early medieval period, establishing a civil legal system. It also influenced other civil codes throughout Europe (even though it wasn't the first in Europe).
In 1802, Napoleon signed the Peace of Amiens, a temporary peace with the British. In order to be able to concentrate solely on his European affairs, he sold France's Louisiana territory to the U.S. in 1803. And in 1804, he set the foundation for much of Europe's legal system by establishing the Napoleonic Code.