Muscle pathologies after cervical spine distortion-like exposure--a porcine model

Area of Science:

• Biomechanical Engineering
• Orthopedic Surgery
• Histopathology

Background:

• Whiplash-associated disorders are common after rear-end collisions.
• The specific biomechanical forces and resulting tissue damage in posterior cervical muscles are not fully understood.
• Understanding these mechanisms is crucial for developing effective injury prevention and treatment strategies.

Purpose of the Study:

• To histologically evaluate posterior cervical muscle damage in pigs subjected to a simulated high-speed rear-end impact.
• To investigate injury signs such as hemorrhage and inflammatory responses in neck muscles.

Main Methods:

• Four anesthetized pigs underwent a cervical spine distortion (CSD)-like motion simulating rear-end impact.
• Tissue samples from posterior cervical muscles were collected at 4 and 6 hours post-trauma.
• Histological analysis using paraffin-embedded sections identified muscle injuries, including bleeding and inflammatory cell reactions.

Main Results:

• Histological analysis confirmed injuries in deep posterior cervical muscles, particularly the musculus obliquus and splenius muscles.
• Laminar bleedings and increased cellular reactions were observed in multiple samples.
• All tested animals exhibited muscle injury signs in over 75% of analyzed neck muscles.

Conclusions:

• Simulated severe cervical spine distortion reliably induces posterior cervical muscle injuries.
• These findings confirm muscle damage under significant loading conditions.
• Further research is warranted to investigate injury occurrence at lower impact forces.