But your cartilage is not like your tires. Throughout life, it undergoes continual remodeling; it degrades and is replaced by newly made cells. Healthy cartilage makes a very smooth, friction-free surface that disburses
forces evenly from one bone to the next.
So, in that respect I guess, cartilage does act like a bike tire; when a tire is full of air, it keeps the rim from bending because it transfers load evenly from the road to the wheel. Brilliant.
How Cartilage is Different:
The surprising thing about cartilage is that is has no blood supply. It gets nutrition from the pumping action when you move. Pressure on and pressure off moves nutrients through the cartilage and makes it healthier. That’s why people with cartilage damage often feel stiff after sitting still; without movement, the joint isn’t lubricated.