• 대한족부족관절학회지
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• 제13권2호
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• pp.162-168
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• 2009

Purpose: To evaluate the efficiency of the minimally invasive percutaneous plate osteosynthesis (MIPPO) with locking compression plate (LCP) for distal tibial metaphyseal intra-articular fracture compared with extra-articular fracture. Materials and Methods: From February 2006 to June 2008, 21 patients with distal tibia metaphyseal intra-articular fracture and 20 patients with extra-articular fracture were treated operatively by MIPPO technique with LCP and followed for at least one year. In the group with intra-articular fracture, mean age was 48.85 years old and a mean follow-up was 15 months. In the other group with extra-articular fracture, mean age was 52.35 years old and a mean follow-up was 14.5 months. The type of fracture was evaluated using the AO/OTA classification and open-fractures were according to the Gustilo-And gron classification. Radiologic evaluation with fracture healing and tibial alignment, clinical evaluation with Olerud and Molander ankle score and restriction of motion were done for treatment. Results: According to AO/OTA classification, There were 21 type A, 15 type B, 5 type C. Average union time of the intra-articular fracture (type B, C) was 18.7 weeks. Average union time of the extra-articular fracture (type A) was 17.1 weeks. All fractures were healed without malunion. There were no difference of mean restriction angle between intra-articular fracture (ankle dorsiflexion was 3.57 degree, plantar-flexion was 5.95 degree) and extra-articular fracture (ankle dorsiflexion was 3 degree, plantar-flexion was 3.75 degree). There were no difference of Olerud and Molander ankle score between them as a mean score of intra-articular and extra-articular was 89.25, 91.25 each other. As a complication, there were 3 case of skin necrosis, 8 case of discomfortable skin tenting by plate and 1 superficial infection, but could be healed by conservative care. Conclusion: MIPPO technique, combined articular reduction, with LCP of distal tibial metaphyseal fracture was a good method with high functional recovery.

• 대한치과기공학회지
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• 제36권4호
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• pp.231-237
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• 2014

Purpose: This study was performed fracture strength test by conducted change of abutment and coping shape for suggesting monolithic all ceramic crown which has thin thickness and superior strength of the occlusal surface. Methods: The specimens on the four kinds abutment was made according to thickness of occlusal surface and angle of axis surface. And All ceramic coping specimens of 6 different kinds was made by the CAD/CAM Method. Compression strength test using the UTM and the verification of compression-stress situation using the 3D finite element method were conducted under optimum conditions. Results: 516C specimen was showed the strongest compression-fracture strength, followed by 516FR, 516F45, specimens. Did not show significant differences between 516FR and 516F45. 516C of the universal testing machine the specimen's surface that are within the vertical load is small, finite element method of a uniformly distributed load, so the value received suggests otherwise. Conclusion: In conclusion, abutments of monolithic ziconia ceramic when having a same thickness of the occlusal, as the angle of occlusal edge is small, the stress is well dispersed and it can endure well in the fracture.

• 한국추진공학회지
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• 제18권4호
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• pp.61-66
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• 2014

본 연구의 흑연은 로켓 노즐목 재료로 많이 사용되는 것으로써 온도, 가공성 및 무게 측면에서 유리하다. 하지만 고온 및 고압상태에서 고속으로 취성파괴 되므로 설계 시 구조적 안정성을 충분히 확보해야 한다. 본 연구에서는 로켓 노즐목에 이용되는 ATJ 흑연의 압축 파괴 거동에 대해 연구했다. 상온 및 고온에서 ASTM C 695에 준하여 일축 압축 시험을 수행하였다. 또한 시편의 단면적 변화에 의한 압축강도 및 파단특성을 분석하였다.

• Journal of Acupuncture Research
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• 제19권6호
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• pp.35-48
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• 2002

Objective : The study was performed to evaluate the effect of treatment for thoracolumbar compression fracture by using Bee Venom Acupuncture that is well known for anti-inflammatory and analgesic effect. Methods : We investigated 39 cases of patient with thoracolumbar compression fracture. The patients with thoracolumbar compression fracture were treated at the department of acupuncture & moxibustion of Kyung-Won University Oriental Hospital from 1st January 2001 to 30th August 2002. We selected for two groups. One group was treated by Bee Venom Acupuncture therapy(Bee Venom Acupuncture Group : BAG), the other group was treated by Filiform Acupuncture therapy(None Bee Venom Acupuncture Group : NBAG). Results : 1. The distribution showed female predominance in sex and 70's predominance in age. The largest group was "accidental fall" and the next was "lifting heavy objects" in causes, and within 2 weeks in the duration of disease 2. In the duration of admission, the largest group was within 4 weeks. In regard to level of injury, T12 was found to be most predominant, followed in turn by L1, L2, L5. In regard to grade of clinical symptoms, Grade III was most predominant, followed by Grade II, Grade IV. 3. In the results of treatment, 87.5% were above "Good" in BAG and 47.8% in NBAG. 4. In the result of treatment due to the grade of clinical symptoms, BAG was more excellent than NBAG on the whols grade. 5. In the result of treatment due to duration of admission, the duration of admission was not in proportion to the results of treatment. 6. In the change of lumber flexion, the improvement above $80^{\circ}$ was 50% in BAG and 21.7% in NBAG 7. In the stability of treatment, the BAG and NBAG did't show any detrimental change in GOT, GPT, r-GTP, BUN, creatinine. Conclusions : In the treatment of thoracolumbar compression fracture, the Bee Venom Acupuncture can be regarded as more effective treatment than Filiform Acupuncture in the clinical practice. This is expected to be available for clinical use.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제11권1호
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• pp.69-77
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• 1989

This is a retrospective study on 219 patients with mandibular fracture. The patients were treated in the Dept. of Oral Maxillofacial Surgery of WON KWANG UNIV. HOSPITAL from Aug. 1, 1984 to Sept. 30. 1988. The results were as follows. 1. The mandibular fractures occured most frequently in the twenties(35%) and male were predominant (74.7%) than females. 2. The most frequent etiologic factor was traffic accident(34.3%). 3. The most common location of fracture was symphysis(37.1%). And angle(27.6%), condyle(25.7%), ramus(1.6%) were next in order of frequency. 4. In mandible fracture, they have an average 1.8 fracture line. 5. The use of plate & screw system were more increased in the comparison of each year. 6. Intermaxillary fixation period was more reduced from the concept of 6 weeks fixation, due to the use of Plate & screw system. 7. Postoperative acute wound infection was developed 9.6% in 219 mandibular fracture patients. The compression osteosynthesis was most common cause of acute wound infection than any other treatment method. 8. Postoperative malocclusion was developed 4% in 219 mandibular fracture. And the compression osteosynthesis was most common cause of malocclusion. 9. Acute wound infection was detailed by the approach method. The Intraoral & extraoral combination method was most common cause on acute infection and intraoral, extraoral approach method was next in order of frequency. 10. Normal mouth opening process was proportioned to IMF period. The short IMF period have a fast normal mouth opening process.

• Clinics in Shoulder and Elbow
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• 제15권2호
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• pp.117-122
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• 2012

목적: 전위성 쇄골 간부 골절에서 관혈적 정복술 후 윤곽 성형된 잠김 압박 금속판(precontoured locking compression plate)을 이용하여 내고정을 시행한 환자를 대상으로 방사선학적 결과 및 임상적 결과를 분석하여 윤곽 성형된 잠김 압박 금속판의 유용성을 알아보고자 하였다. 대상 및 방법: 2009년 3월부터 2010년 2월까지 본원에서 쇄골 간부 골절에 대해 윤곽 성형된 잠김 압박 금속판을 이용하여 관혈적 정복 및 금속 고정술을 시행하고 1년 이상의 추시가 가능했던 34예를 대상으로 하였다. 수술 후 방사선학적 결과는 골유합 여부와 성별 및 나이에 따른 골유합 시기의 차이를 평가 하였으며 임상적 결과는 최종 추시 시 quick DASH Score 및 반대측과 관절 운동 범위의 차이를 평가 하여 분석하였다. 결과: 방사선학적 평가에서 모든 예에서 골유합을 얻을 수 있었으며 평균 골유합 기간은 12.3주였으며 성별 및 나이에 따른 골유합 기간은 통계학적으로 유의한 차이를 보이지 않았다(p=0.87). 임상적 평가에서 최종 quick DASH Score는 평균 23.5점 (12~42)이었으며, 최종 추시시 견관절의 운동은 건측과 비교 시 통계학적으로 유의한 차이를 보이지 않았다 (p=0.69). 결론: 전위성 쇄골 간부 골절에 대해 윤곽 성형된 잠김 압박 금속판을 이용한 내고정술은 정확한 해부학적 정복과 견고한 내고정을 유지 할 수 있어 조기 운동이 가능하여 견관절 운동의 회복과 함께 전례에서 골유합을 얻을 수 있어 쇄골 간부 골절 치료에서 유용하게 사용될 수 있다고 사료된다.

• Investigative Magnetic Resonance Imaging
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• 제21권3호
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• pp.154-161
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• 2017

Purpose: To evaluate the diagnostic performance of diffusion-weighted steady-state free precession (DW-SSFP) in comparison to diffusion-weighted echo-planar imaging (DW-EPI) for differentiating the neoplastic and benign osteoporotic vertebral compression fractures. Materials and Methods: The subjects were 40 patients with recent vertebral compression fractures but no history of vertebroplasty, spine operation, or chemotherapy. They had received 3-Tesla (T) spine magnetic resonance imaging (MRI), including both DW-SSFP and DW-EPI sequences. The 40 patients included 20 with neoplastic vertebral fracture and 20 with benign osteoporotic vertebral fracture. In each fracture lesion, we obtained the signal intensity normalized by the signal intensity of normal bone marrow (SI norm) on DW-SSFP and the apparent diffusion coefficient (ADC) on DW-EPI. The correlation between the SI norm and the ADC in each lesion was analyzed using linear regression. The optimal cut-off values for the diagnosis of neoplastic fracture were determined in each sequence using Youden's J statistics and receiver operating characteristic curve analyses. Results: In the neoplastic fracture, the median SI norm on DW-SSFP was higher and the median ADC on DW-EPI was lower than the benign osteoporotic fracture (5.24 vs. 1.30, P = 0.032, and 0.86 vs. 1.48, P = 0.041, respectively). Inverse linear correlations were evident between SI norm and ADC in both neoplastic and benign osteoporotic fractures (r = -0.45 and -0.61, respectively). The optimal cut-off values for diagnosis of neoplastic fracture were SI norm of 3.0 in DW-SSFP with the sensitivity and specificity of 90.4% (95% confidence interval [CI]: 81.0-99.0) and 95.3% (95% CI: 90.0-100.0), respectively, and ADC of 1.3 in DW-EPI with the sensitivity and specificity of 90.5% (95% CI: 80.0-100.0) and 70.4% (95% CI: 60.0-80.0), respectively. Conclusion: In 3-T MRI, DW-SSFP has comparable sensitivity and specificity to DW-EPI in differentiating the neoplastic vertebral fracture from the benign osteoporotic vertebral fracture.

• Journal of Korean Neurosurgical Society
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• 제60권2호
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• pp.181-188
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• 2017

Objective : The objective of this study was to analyze the correlation between further compression and necrotic area in osteoporotic vertebral fracture (OVF) patients with contrast-enhanced magnetic resonance imaging (CEMRI). In addition, we investigated the radiological and clinical outcome according to the range of the necrotic area. Methods : Between 2012 and 2014, the study subjects were 82 OVF patients who did not undergo vertebroplasty or surgical treatment. The fracture areas examined on CEMRI at admission were defined as edematous if enhancement was seen and as necrotic if no enhancement was seen. The correlation between further compression and the necrotic and edematous areas of CEMRI, age, and bone mineral density was examined. Also, necrotic areas were classified into those with less than 25% (non-necrosis group) and those with more than 25% (necrosis group) according to the percentages of the entire vertebral body. For both groups, further compression and the changes in wedge and kyphotic angles were examined at admission and at 1 week, 3 months, and 6 months after admission, while the clinical outcomes were compared using the visual analog scale (VAS) and Eastern Cooperative Oncology Group (ECOG) performance status grade. Results : Further compression was $14.78{\pm}11.11%$ at 1 month and $21.75{\pm}14.43%$ at 6 months. There was a very strong correlation between the necrotic lesion of CEMRI and further compression (r=0.690, p<0.001). The compression of the necrosis group was $33.52{\pm}12.96%$, which was higher than that of the non-necrosis group, $14.96{\pm}10.34%$ (p<0.005). Also, there was a statistically significantly higher number of intervertebral cleft development and surgical treatments being performed in the necrosis group than in the non-necrosis group (p<0.005). Moreover, there was a statistical difference in the decrease in the height of the vertebral body, and an increase was observed in the kyphotic change of wedge angle progression. There was also a difference in the VAS and ECOG performance scales. Conclusion : The necrotic area of CEMRI in OVF had a strong correlation with further compression over time. In addition, with increasing necrosis, intervertebral clefts occurred more frequently, which induced kyphotic changes and resulted in poor clinical outcomes. Therefore, identifying necrotic areas by performing CEMRI on OVF patients would be helpful in determining their prognosis and treatment course.

• Steel and Composite Structures
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• 제31권2호
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• pp.113-123
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• 2019

In this study, carbon fiber/epoxy (CF/EP) composites were interleaved with aramid nonwoven veils with an areal weight density of $8.5g/m^2$ to improve their Mode-I fracture toughness. The control and aramid interleaved CF/EP composite laminates were manufactured by VARTM in a [0]4 configuration. Tensile, three-point bending, compression, interlaminar shear, Charpy impact and Mode-I (DCB) fracture toughness values were determined to evaluate the effects of aramid nonwoven fabrics on the mechanical performance of the CF/EP composites. Thermomechanical behavior of the specimens was investigated by Dynamic Mechanical Analysis (DMA). The results showed that the propagation Mode-I fracture toughness values of CF/EP composites can be significantly improved (by about 72%) using aramid nonwoven fabrics. It was found that the main extrinsic toughening mechanism is aramid microfiber bridging acting behind the crack-tip. The incorporation of these nonwovens also increased interlaminar shear and Charpy impact strength by 10 and 16.5%, respectively. Moreover, it was revealed that the damping ability of the composites increased with the incorporation of aramid nonwoven fabrics in the interlaminar region of composites. On the other hand, they caused a reduction in in-plane mechanical properties due to the reduced carbon fiber volume fraction, increased thickness and void formation in the composites.

• 한국임상수의학회지
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• 제26권6호
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• pp.644-646
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• 2009

5년령의 체중 4.58 kg 수컷 긴 팔 원숭이가 후지 파행 증상으로 건국대학교 동물 병원에 내원하였다. 신체 검사에서 우측 후지 경골 부위의 연부조직 손상을 보였으며 방사선 사진에서 우측 경골과 비골의 단순 골절이 관찰되었다. 개방형 정복을 실시한 후 tubular dynamic compression plate와 나사를 이용한 고정을 실시하였다. 수술 9주 후 방사선 사진 검사에서 잘 발달된 가골 형성이 골절 부위 피질에서 관찰되었다. 수술 3개월 후 후지 파행 증상을 보이 지 않고 정상 보행이 가능하였다.