Bone Growth Repair Model Damage to blood vessels

Bone Growth & Repair Model Damage to blood vessels Immature bone Ossification Mature bone Fibroblasts Start of Callus Trauma Osteoblasts Callus to bone Osteoclasts

Bone Repair Cycle 1. Trauma-Damage to blood vessels

Bone Repair Cycle Fibroblasts Start of Callus Osteoblasts

Bone Repair Cycle Osteoblasts Stress Osteoclasts

Bone Repair Cycle Callus to bone Remodeling

Bone Repair Cycle 1. Trauma-Damage to blood vessels 2. Fibroblasts 3. Start of Callus 4. Osteoblasts 5. Stress 6. Osteoclasts 7. Callus to bone

Bone Repair Cycle 8. Wolf’s law: a bone will adapt to mechanical stresses and strains by changing size, shape and structure. Therefore once the cast is removed, the bone must be subjected to normal stresses and strains so that the tensile strength can be regained before the healing process is complete.

Tissue Response to Trauma

Tissue Repair Diagram Trauma Increased risk of injury Reduced risk of injury Primary Injury Blood, damaged tissue Hematoma Secondary Response necrosis Acute Inflammation Return to full activity Repair Phase Less than optimal Recovery Remodeling Optimal Recovery Atrophy Inadequate Rehab Adequate Pain Spasms

Tissue Repair 5 signs of injury (AKA: ? ? ? ) 1. 2. 3. 4. 5. Red Swelling Heat Pain Loss of function