While bones are increasing in length, they are also increasing in diameter; growth in diameter can continue even after longitudinal growth ceases. This growth by adding to the free surface of bone is called appositional growth.

What does Appositional growth refer to?

Appositional growth is the increase in the diameter of bones by the addition of bone tissue at the surface of bones. Bone remodeling involves the processes of bone deposition by osteoblasts and bone resorption by osteoclasts.

Why does Appositional growth occur?

Appositional growth is the second type of growth which increases the bone width or diameter. This growth occurs as a result of depositing new bone tissue on the endosteal and periosteal surfaces. Therefore, new layers are formed on the surface of pre-existing bones, increasing the thickness of the bone.