Third-Degree Burns Can Extend to Bone: Full-Thickness Injury Severity

Third-degree (full-thickness) burns destroy epidermis, dermis, and extend into subcutaneous tissue. In severe cases, the thermal energy penetrates further to involve:

• Fascia
• Muscle
• Tendon
• Ligament
• Bone (periosteum, cortex, marrow)

Bone involvement signifies a fourth-degree burn (some classifications). Consequences:

• Osteomyelitis risk
• Non-union if fracture present
• Amputation may be necessary for limb viability
• Complex reconstruction (free flaps, bone grafts)

Immediate specialized burn center referral is critical for any deep burn near joints or bony prominences.