Cartilage

Tough ( Tuff )
Smooth
Strong
On ends of bones that move across each other.
Stops friction
Acts as a shock absorber 


Three things that can damage your cartilage:
Osteoarthritis
Torn meniscus
Playing football,Rugby,Tennis,Basketball,Squash and Ski-ing


Septic arthritis: Septic arthritis is a painful infection in a joint. The infection can come from germs that travel through your bloodstream from another part of your body. Septic arthritis can also occur when a penetrating injury delivers germs directly into the joint. (Google definition)


Osteo arthritis: this is when your cartilage breaks down.