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Original Articles
- The Biomechanics of Hybrid External Fixator: The Effect of Periarticular Half Pin on Frame Stiffness
- Jong Keon Oh, Duk Young Jung, In Su Kim
- J Korean Soc Fract 2002;15(2):114-122. Published online April 30, 2002
- DOI: https://doi.org/10.12671/jksf.2002.15.2.114
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Abstract
PDF - OBJECTIVES
The purpose of this study was to identify the biomechanical effect of periarticular half pin in the hybrid external fixator.
METHODS
Simulated tibial plateau fractures were created using a polyvinylchloride pipe. Seven frame configurations were tested : a four-ring Ilizarov frame, a hybrid frame with three wires on peri-articular fragment, hybrid frames with wires and half pins on peri-articular fragment by four different configurations, a hybrid frame constructed with multiple levels of fixation in the periarticular fragment. A materials testing machine was used to apply pure compression, anterior and posterior bending, medial and lateral bending, and torsion. Stiffness values were calculated from the load deformation and torque angle curves RESULTS: The overall stiffness of the hybrid frame was increased up to 30% by replacing a coronal tension wire with a half pin placed on the sagittal plane. The hybrid frame constructed with two wires and a half pin on the sagittal plane of the periarticular fragment showed overall stiffness compatible with that of multi-level peri-articular fixation frame.
CONCLUSION
Our results show that the half pin placed on the periarticular fragment can be a effective tool to increase the stiffness of hybrid external fixators in this periarticular tibia fracture model.
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- The Biomechanics of Hybrid External Fixator: Effectiveness of Bar to Ring Connection
- Jong Keon Oh, Duk Young Jung, Seong Yong Yoon
- J Korean Soc Fract 2001;14(4):783-791. Published online October 31, 2001
- DOI: https://doi.org/10.12671/jksf.2001.14.4.783
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Abstract
PDF
- OBJECTIVES
The biomechanical effects of bar to ring connection in a hybrid external fixator have not yet been clearly identified. The purpose of this study was to identify the biomechanical effects of bar to ring augmentation in the hybrid external fixator.
METHODS
Simulated tibial plateau fractures were created using a polyvinylchloride pipe. Groups of simulated periarticular tibia fractures were stabilized with one of six different external fixation constructs with components from one manufacturer. Six frame configurations were tested: a four-ring Ilizarov frame, a hybrid frame without bar to ring augmentation, hybrid frames with three different bar to ring augmentations, a hybrid frame constructed with multiple levels of fixation in the periarticular fragment. A material testing machine was used to apply pure compression, anterior and posterior bending, medial and lateral bending, and torsion. Stiffness values were calculated from the load deformation and torque angle curves RESULTS: The four-ring Ilizarov fixator was the stiffest in all modes of testing. Frame augmentation with three different types of bar-to-ring connection did increase stiffness in all modes of testing. No statistical difference was found between the stiffness of the frames with three different types of bar to ring augmentations. The stiffness of a hybrid frame constructed with multiple levels of fixation in the periarticular fragment was comparable to that of the fixators with bar to ring augmentation.
CONCLUSION
Our results show that the bar to ring augmentation increases the overall stiffness of hybrid external fixators in this periarticular tibia fracture model by 27-76%.
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