What is the primary function of collagen in bones?

Collagen plays a critical role in the structural integrity and function of bones, but its primary contribution is providing tensile strength. This is important because while bones need to be rigid to support the body and withstand compressive forces, there is also a significant need for flexibility and resistance to various types of stresses. Collagen fibers form a scaffold that not only helps maintain the shape of the bone but also allows it to absorb and distribute mechanical loads, preventing fractures.

The interplay between collagen and hydroxyapatite, the mineral component of bone, is essential for optimal bone strength and durability. While collagen does not contribute directly to the rigidity of bones—instead, this is primarily the role of minerals—the presence of collagen in bone ensures that while they resist bending and breaking, they can still maintain some flexibility. This combination of properties enables bones to withstand various physical activities without easily breaking.