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How does bone remodeling keep the skeleton strong and help fractures heal?

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bone disease Defect of tibia, caused by septic osteomyelitis in childhood, with compensatory thickening of the fibula (right). Normal bones are shown at left.

Bone remodeling is a continuous, lifelong process of synthesis and destruction that maintains the skeleton's structural integrity and regulates systemic calcium levels. This process relies on two primary cell types: osteoclasts, which resorb (break down) bone tissue, and osteoblasts, which synthesize new bone.1

Maintaining Skeletal Strength

The skeleton adapts to mechanical demands through a process governed by Wolff’s law, which states that bone architecture changes in response to the functional forces placed upon it. Mechanical stress generates local electrical signals—often attributed to the piezoelectric properties of bone—that guide where remodeling occurs. Increased stress typically suppresses resorption and promotes formation, while disuse leads to decreased bone mass.2

Healing Fractures

When a fracture occurs, the body immediately initiates a healing response. A fracture hematoma forms, which is eventually replaced by a bridge of new bone tissue called callus. Once the fracture has united, the region undergoes remodeling to refine the new tissue and accommodate the specific mechanical demands of the bone, effectively restoring its original microstructure.3