What are the steps in the endochondral bone formation?

Endochondral bone formation involves several key steps: First, a cartilage model of the bone develops, which serves as a scaffold. Next, this cartilage undergoes hypertrophy, followed by calcification and the invasion of blood vessels. Osteoblasts then replace the calcified cartilage with bone tissue, leading to the formation of primary ossification centers. Finally, the process continues with the development of secondary ossification centers, allowing for bone growth and the eventual formation of the mature bone structure.