Why do greenstick fracture occur in children?

Greenstick fractures occur in children due to their softer, more flexible bones, which are not fully mineralized. When subjected to stress or bending forces, these bones can bend and break on one side while remaining intact on the other, resembling the way a young tree branch breaks. This type of fracture is more common in children because their bones are still growing and have not yet reached the density of adult bones.