Why is bone viscoelastic?

Bone is viscoelastic because it exhibits both viscous (flow-like) and elastic (recovery-like) properties when subjected to load. The organic matrix (collagen) provides elasticity, allowing bone to deform and return to its original shape, while the mineral component (hydroxyapatite) provides stiffness. The combination of these components results in bone's viscoelastic behavior, which enables it to withstand various mechanical stresses.