Thesis
EFFECT OF PLATE BONE DISTANCE IN COMBINATION WITH WORKING LENGTH AND SCREW NUMBER ON 2.0 MM LOCKING CONSTRUCT STIFFNESS AND STRAIN IN A DIAPHYSEAL FRACTURE GAP MODEL
Masters by Research, Murdoch University
2023
Abstract
Objectives:
To investigate the effect of plate bone distance (PBD) in combination with working length (WL) and screw number (SN) on locking compression plate stiffness and plate strain in four-point bending and torsion.
Study Design:
In-vitro biomechanical study
Materials and methods:
A mid-diaphyseal fracture gap model was created and stabilised with a 12-hole 2.0mm LCP with a 6mm fracture gap. Part 1 evaluated three different PBD across three different WL (total 9 combinations) in four-point compression bending and in torsion. Part 2 evaluated three different PBD across three different SN (total 9 combinations) for a fixed WL in torsion. Six constructs of each combination for part 1 and part 2 were tested to evaluate construct stiffness and plate strain. Comparison between combinations was evaluated with a 2-way ANOVA and post-hoc pairwise comparisons.
Results:
Part 1 showed a longer WL resulted in lower construct stiffness in compression bending (P<0.0001) and in torsion (P<0.0001); however, a greater PBD only resulted in lower construct stiffness in torsion (P=0.047). For each PBD, there was an incremental decrease in construct stiffness as WL was incrementally increased (P<0.0001). Part 2 showed that a greater PBD and a low SN resulted in lower construct stiffness (P=0.015, and P>0.0001, respectively) in torsion. No combination of PBD and SN showed any significant difference for plate strain.
Conclusion:
In this model, incrementally increasing the WL decreased construct stiffness in compression bending, decreased stiffness in torsion, and increased plate strain in compression bending. Incrementally increasing PBD only decreased construct stiffness in torsion. Secondly, for a fixed WL, a greater PBD and low SN decreased construct stiffness in torsion; however, no significant effect on plate strain was identified.
Details
- Title
- EFFECT OF PLATE BONE DISTANCE IN COMBINATION WITH WORKING LENGTH AND SCREW NUMBER ON 2.0 MM LOCKING CONSTRUCT STIFFNESS AND STRAIN IN A DIAPHYSEAL FRACTURE GAP MODEL
- Authors/Creators
- Alecia A Evans
- Contributors
- Giselle Hosgood (Supervisor) - Murdoch University, School of Veterinary MedicineMark Glyde (Supervisor)
- Awarding Institution
- Murdoch University; Masters by Research
- Identifiers
- 991005609152107891
- Murdoch Affiliation
- School of Veterinary Medicine
- Resource Type
- Thesis
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