Cartilage

What it is

• Stops friction
• Acts as an absorber
• Tough
• Smooth
• Strong 
• On ends of bones that move across each other.

Thing that can damage cartilags.

• Heavy impact
• Wear and tear
• Stress
• Lack of movement

These can result in bone grinding as they move over each other and cause arthiritis. 

Two types of arthiritis are osteoarthritis and rheumatoid arthiritis. Rheumatoid arthiritis affects joints and it can cause bone erosion and lumps. This arthiritis can occur in the hands, neck, lower back, knees and hips are the most common symptons.