Correlation Between Traumatic Brain Injuries and Callus Formation in Long bone Fractures

Area of Science:

• Orthopaedic Surgery
• Trauma Medicine
• Biomedical Research

Background:

• An orthopaedic aphorism suggests head injuries accelerate long bone fracture healing with excessive callus.
• Evidence supporting this aphorism is limited, necessitating further investigation into the underlying mechanisms.

Purpose of the Study:

• To evaluate the impact of traumatic head injury on bone healing in adults with diaphyseal lower limb fractures.
• To investigate the role of specific serum parameters in mediating enhanced fracture healing post-head injury.

Main Methods:

• A comparative study included 15 patients with fractures and head injuries (cases) and 15 controls.
• Serum levels of IL-6, growth hormone, PTH, prolactin, and ALP were measured.
• Callus volume was assessed via serial radiographs and compared between groups.

Main Results:

• Patients with head injuries exhibited significantly higher mean levels of growth hormone, IL-6, and prolactin at 5 weeks (p=0.001).
• Increased callus formation was observed in the head injury group compared to controls.
• IL-6 levels correlated with head injury severity.

Conclusions:

• Head injury initiates a humoral cascade involving IL-6, growth hormone, and prolactin, which enhances fracture healing.
• Elevated parathyroid hormone levels were also noted, potentially contributing to osteogenesis.