Optimization of a closed rat tibial fracture model

Area of Science:

• Orthopedics
• Biomedical Engineering
• Regenerative Medicine

Background:

• Closed fracture models are preferred for studying bone healing due to the periosteum's role.
• Existing fracture induction methods have drawbacks like complications and undesirable effects.
• Optimizing in vivo models is crucial for accurate fracture healing research.

Purpose of the Study:

• To optimize and evaluate an in vivo rat tibial fracture model.
• To utilize three-point bending pliers for a reproducible closed fracture.
• To facilitate the study of secondary bone fracture healing in rats.

Main Methods:

• Modified three-point bending pliers were used to create closed rat tibial fractures.
• Intramedullary pins (23 G × 1½″) were used for stabilization.
• Fracture characteristics (comminution, alignment) and healing were monitored for 6 weeks.

Main Results:

• Transverse tibial fractures were consistently induced in the mid-to-proximal third.
• Radiographic bone union occurred within 2-3 weeks post-operation.
• Minimal bone comminution and no soft tissue damage were observed, with good reproducibility.

Conclusions:

• The optimized three-point bending pliers model provides a reliable method for inducing tibial fractures in rats.
• This model demonstrates minimal comminution and soft tissue damage, ideal for studying secondary bone healing.
• The model's reproducibility makes it highly feasible for in vivo laboratory research applications.