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The Biomechanics of Hybrid External Fixator: Effectiveness of Bar to Ring Connection
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Jong Keon Oh, Duk Young Jung, Seong Yong Yoon
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J Korean Soc Fract 2001;14(4):783-791. Published online October 31, 2001
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DOI: https://doi.org/10.12671/jksf.2001.14.4.783
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 Abstract
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- 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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Radiation Exposure from Fluoroscopy during Orthopaedic Surgical Procedures
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Su Young Bae, Jong Oh Kim, Jae Doo Yoo, Seong Yong Yoon, Jin Won Jang
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J Korean Soc Fract 2001;14(4):792-798. Published online October 31, 2001
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DOI: https://doi.org/10.12671/jksf.2001.14.4.792
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Abstract
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- PURPOSE
The aim of this study was to evaluate the radiation dose administered in orthopedic operative procedures and to determine whether all operation room personnel must use the lead protector.
MATERIALS AND METHODS
From March 2001 to May 2001, sixty six orthopedic operations were done with fluoroscopic intensifier(Series 9600TM, OEC Medical Systems Inc.). The accumulative exposure doses of operator, 1st assist, scrub nurse, circulating nurse and anesthesiologist were assessed by TLD(Thermo luminescence dosimeter) and compared with the dose limit set by the KINS(Korea Institute of Nuclear Safety). The exposure times and doses were evaluated in each cases and analyzed according to the each procedure. The exposure doses were assessed by the distance (Om, 0.5m, 1m, 2m) from the fluoroscopic generator.
RESULTS
Accumulative exposure doses(3 months) were checked 1.37mSv in operator, 1.73mSv in 1st assist, 0.17mSv in scrub nurse, 1.01mSv in circulating nurse, 0.01mSv in anesthesiologists and all doses were lower than dose limit set by the KINS(12.5mSv). Low exposure was checked in procedure of hand, ankle, cervical spine but high exposure was checked in IM nailing of femur(one way Anova with postHoc test, p<0.05). The exposure doses were decreased with the distance and exposure dose out of 1m was minimal.
CONCLUSION
Radiation is higher in IM nailing procedure but the total accumulative doses were safe especially in personnel who can fall apart from the operation field more than lm. So, we conclude that the lead protector is not essential to the all operation room personnel.
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Citations
Citations to this article as recorded by  - Radiation exposure and fluoroscopically-guided interventional procedures among orthopedic surgeons in South Korea
Seonghoon Kang, Eun Shil Cha, Ye Jin Bang, Teresa W. Na, Dalnim Lee, Sang Youn Song, Won Jin Lee
Journal of Occupational Medicine and Toxicology.2020;[Epub] CrossRef
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