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Can monocortical miniplates provide bony compression?. An experimental model
C J Kerawala1, W Allan, E D Williams
1Department of Oral and Maxillofacial Surgery, North Hampshire Hospital, Aldermaston Road, Basingstoke, Hampshire RG24 9NA, UK. c.kerawala@cwcom.net
The British Journal of Oral & Maxillofacial Surgery
|August 30, 2003
Summary
Eccentric screw placement in monocortical miniplates can achieve some mandibular fracture compression and displacement. This technique offers predictable forces for surgical applications.
Area of Science:
- Maxillofacial surgery
- Biomechanical engineering
- Orthopedic research
Background:
- Monocortical plate systems are used in maxillofacial surgery.
- Eccentric screw placement is a proposed technique for enhanced fracture fixation.
Purpose of the Study:
- To quantify the displacement and compressive forces from eccentric screw placement in a simulated mandibular fracture model.
- To evaluate the efficacy of eccentric screw placement in monocortical systems.
Main Methods:
- An experimental model using five miniplates and Perspex blocks was employed.
- Eccentric screw placement was utilized to simulate mandibular fractures.
Main Results:
- Maximum displacement achieved was 0.67 mm.
- Maximum compressive force recorded was 5.2N (SEM=0.9, range=2.7-7.1).
- Forces were comparable to theoretical predictions based on device dimensions.
Conclusions:
- Eccentric screw placement in monocortical systems can generate measurable compression and displacement at fracture sites.
- The forces produced are predictable and may be clinically relevant for maxillofacial fracture repair.