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Principle and stability of locking plates.
Ralf Gutwald1, Brian Alpert, Rainer Schmelzeisen
1Department of Oral and Maxillofacial Surgery, University of Freiburg, Freiburg, Germany. gutwald@zmk2.ukl.uni-freiburg.de
The Keio Journal of Medicine
|April 26, 2003
Summary
A novel internal Mini-Locking-System offers superior mandibular fracture fixation compared to traditional miniplates. This system enhances stability and reduces bone fragment torsion and gapping during functional loading.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Biomechanics
Background:
- Conventional 2.0 mm miniplates are widely used for mandibular fracture fixation.
- Plate application and screw tightening can lead to bone fragment instability and gapping.
- Improved fixation methods are needed to enhance osteosynthesis outcomes.
Purpose of the Study:
- To compare the stability and fixation quality of a new internal Mini-Locking-System against conventional 2.0 mm miniplates.
- To evaluate the biomechanical performance under simulated functional loading.
Main Methods:
- Standardized osteotomies were created in 16 human cadaver mandibles.
- Fixation was performed using a 6-hole plate on the oblique line for both systems.
- A three-dimensional in-vitro model simulated functional loading to assess osteosynthesis and stability.
Main Results:
- Miniplate fixation resulted in significant bone fragment torsion and gapping due to pressure on the bone.
- The Mini-Locking-System demonstrated significantly less gapping and torsion.
- During functional loading, the Mini-Locking-System exhibited substantially higher stability compared to miniplates.
Conclusions:
- The Mini-Locking-System provides superior stability and reduces fixation-related complications in mandibular osteosynthesis.
- Its fixation principle, mimicking a fixateur, transmits loading forces effectively, enhancing overall stability.