Duk-Young Jung; Sung-Jae Lee; Seon-Chil Kim; Jong-Keon Oh

doi:10.12671/jkfs.2010.23.2.220

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Original Article
Effect of Fracture Gap on Biomechanical Stability of Compression Bone-Plate Fixation System after Bone Fracture Augmentation: Duk-Young Jung, Ph.D., Sung-Jae Lee, Ph.D., Seon-Chil Kim, Ph.D., Jong-Keon Oh, M.D.; Journal of the Korean Fracture Society 2010;23(2):220-226.
DOI: https://doi.org/10.12671/jkfs.2010.23.2.220
Published online: April 30, 2010

^*Senior Products Industrial Center, Busan Techno-park, Busan, Korea.

^†Department of Biomedical Engineering, Inje University, Gimhae, Korea.

^‡Department of Radiologic Technology, Daegu Health College, Daegu, Korea.

^§Department of Orthopedic Surgery, Korea University College of Medicine, Seoul, Korea.

Address reprint requests to: Jong-Keon Oh, M.D. Department of Orthopedic Surgery, Korea University College of Medicine, 80, Guro-dong, Guro-gu, Seoul 152-703, Korea. Tel: 82-2-2626-3088, Fax: 82-2-2626-1164, jkoh@korea.ac.kr

• Received: October 7, 2009 • Revised: December 10, 2009 • Accepted: January 28, 2010

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Abstract
REFERENCES

Abstract

Purpose
The goal of this study using the biomechanical test was to evaluate the mechanical stability of the bone-plate fixation system according to changes of the fracture gap sizes and widths.
Materials and Methods
For mechanical test, four types with different fracture models simulating the clinical situations were constructed depending on the gap size (FGS, mm) and the gap width (FGW, %) at the fracture site: 0 mm/0%, 1 mm/100%, 4 mm/100%, 4 mm/50%. For analyzing the effects of fracture gap on the biomechanical stability of the bone-plate fixation system, 4-point bending test was performed under all same conditions.
Results
It was found that the fracture gap sizes of 1 and 4 mm decreased mechanical stiffness by about 50~60% or more. Furthermore, even without fracture gap size, 50% or more fracture gap width considerably decreased mechanical stiffness and suggested the possibility of plate damage through strain results.
Conclusion
Our findings suggested that at least 50% contact of the fracture faces in a fracture surgery would be maintained to increase the mechanical stability of the bone-plate fixation system.
Key words: Bone fracture, LC-DCP, Fracture gap and width, Biomechanical stability

REFERENCES

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4. Gardner MJ, Brophy RH, Campbell D, et al. The mechanical behavior of locking compression plates compared with dynamic compression plates in a cadaver radius model. J Orthop Trauma, 2005;19:597-603.
5. Gautier E, Perren SM, Cordey J. Effect of plate position relative to bending direction on the rigidity of a plate ostosynthesis. A theoretical analysis. Injury, 2000;31:Suppl 3. C14-C20.
6. Korner J, Diederichs G, Arzdorf M, et al. A biomechanical evaluation of methods of distal humerus fracture fixation using locking compression plate versus conventional reconstruction plates. J Orthop Trauma, 2004;18:286-293.
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8. Perren SM. Evolution of the internal fixation of long bone fracture. J Bone Joint Surg Br, 2002;84:1093-1110.
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11. Stoffel K, Dieter U, Stachowiak G, Gächter A, Kuster MS. Biomechanical testing of the LCP - how can stability in locked internal fixators be controlled? Injury, 2003;34:Suppl 2. B11-B19.
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Figure 1

The LC-DCP bone fixation system and the epoxy pipe represented as a bone (A) and specimen configurations (B) for the fracture gap sizes & width (mm/%).

Figure 2

Mechanical experiment through 4-pont bending test (A→B→D→C) with LC-DCP bone- plate fixation system.

Figure 3

Determination of the initial and final bending stiffness (Nm/°) with the bending moment (Nm)-bending angle (°) curve.

Figure 4

Comparison of bending moments according to the fracture gap sizes and widths on the LC-DCP fixation system.

Figure 5

Comparison of the initial and final bending stiffness (Nm/°) according to the fracture gap sizes and widths of LC-DCP: ^*indicates significant difference compared with 0 mm/0% model in the initial stiffness.

Figure 6

Comparison of the micro strains (µε) through the four channels (Ch1~Ch4) according to the fracture gap sizes and widths on LC-DCP (p<0.01): ^*indicates significant difference compared with 0 mm/0% model in the initial stiffness.

Figure 7

The facture gap shapes after compression plating with bone-plate fixation system: the white arrows indicate bone fracture position.

Figure & Data

REFERENCES

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Effect of Fracture Gap on Biomechanical Stability of Compression Bone-Plate Fixation System after Bone Fracture Augmentation

J Korean Fract Soc. 2010;23(2):220-226. Published online April 30, 2010

DOI: https://doi.org/10.12671/jkfs.2010.23.2.220

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Effect of Fracture Gap on Biomechanical Stability of Compression Bone-Plate Fixation System after Bone Fracture Augmentation

Figure 1 The LC-DCP bone fixation system and the epoxy pipe represented as a bone (A) and specimen configurations (B) for the fracture gap sizes & width (mm/%).

Figure 2 Mechanical experiment through 4-pont bending test (A→B→D→C) with LC-DCP bone- plate fixation system.

Figure 3 Determination of the initial and final bending stiffness (Nm/°) with the bending moment (Nm)-bending angle (°) curve.

Figure 4 Comparison of bending moments according to the fracture gap sizes and widths on the LC-DCP fixation system.

Figure 5 Comparison of the initial and final bending stiffness (Nm/°) according to the fracture gap sizes and widths of LC-DCP: *indicates significant difference compared with 0 mm/0% model in the initial stiffness.

Figure 6 Comparison of the micro strains (µε) through the four channels (Ch1~Ch4) according to the fracture gap sizes and widths on LC-DCP (p<0.01): *indicates significant difference compared with 0 mm/0% model in the initial stiffness.

Figure 7 The facture gap shapes after compression plating with bone-plate fixation system: the white arrows indicate bone fracture position.

Figure 1

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Figure 7

Effect of Fracture Gap on Biomechanical Stability of Compression Bone-Plate Fixation System after Bone Fracture Augmentation