never
Bone does not usually replace cartilage in the body. Instead, cartilage can be converted into bone during a process called endochondral ossification, which is essential for bone growth and development. This process involves the gradual replacement of cartilage with bone tissue.
So when you break a bone you got a reserve storage of bone you can replace your bone with a cartilage and walk again that's why it takes 6 weeks to calcify cartilage so you can have a new bone to walk around on e.g. you break your leg.
Bone starts out as cartilage and as it matures it becomes bone...
Articular cartilage
hyaline cartilage is located in between bones
Teeth are teeth, neither cartilage or bone. But more similar to bone than cartilage.
cartilage
Endochondral Ossification meaning "formed in cartilage.
ligaments connect bone to bone cartilage is a connective tissue
The human ear (the bit that sticks out of the side of your head) is made of cartilage. However, inside the ear (in the middle hear behind the eardrum) there are 3 bones (the stirrup, the hammer and the anvil) made of bone.
No, you have it backwards. "Chondro" is the prefix for cartilage while "osteo" is the prefix for bone. Endochondral ossificiation is when the cartilage is replaced by bone, so you would have osteocytes moving into the matrix and replacing the chondrocytes.
Cartilage is the soft bone in i.e. your ears and nose. A break in this bone is a fraction.