• 대한정형외과 초음파학회지
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• 제5권1호
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• pp.15-21
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• 2012

상완골 골절에 동반된 요골 신경 마비는 전체 상완골 골절의 약 10%에서 발생하는 것으로 보고되고 있으며, 상완골 골절 수술과 관련하여 발생하는 의인성 요골 신경 마비는 10~20%로 알려져 있어 임상에서 흔히 경험하게 된다. 상완골 골절에 동반된 원발성 요골 신경 마비나 의인성 요골 신경 마비가 발생한 경우 요골 신경이 단열된 것인지 아니면 주위 구조물에 압박된 것인지 등의 요골 신경의 해부학적 상태의 평가는 자연회복을 기다릴 것인지 아니면 수술적 탐색술을 실시할 것인지 여부를 결정하는데 중요하다. 저자들은 상완골 골절에 동반된 원발성 요골 신경 마비 1예와 수술과 관련한 의인성 요골 신경 마비 1예를 초음파 검사로 신경의 해부학적 상태를 확인한 후 신경의 단열이 있었던 1예는 비복신경 이식술을 시행하였고, 신경유착이 있었던 1예는 신경박리술을 시행하여 만족할 만한 임상결과를 얻었기에 초음파를 이용한 요골 신경 검사를 중심으로 문헌 고찰과 함께 보고하고자 한다.

• Clinics in Shoulder and Elbow
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• 제23권3호
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• pp.131-135
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• 2020

Background: Resection of the radial head is a surgical indication for comminuted radial head fracture in which internal fixation is inaccessible. Some complications from the surgery can alter the function of the patient's elbow. The objective of this study was to assess functional outcome of the elbow after resection of the radial head. Methods: A retrospective longitudinal study was performed with patients who underwent radial head resection between 2008 and 2018. Elbow function was assessed by the Mayo Elbow Performance Index (MEPI) for 11 patients comprising three women and eight men. The mean follow-up was 47.6 months. The mean age was 41±10.3 years. Results: Nine patients had a stable and painless elbow. The mean extension-flexion arc was 97.73°±16.03°. The mean values of pronation and supination were 76.8° and 74.5°, respectively. The mean MEPI score was 83.2 points, and restoration of overall function was achieved in 81% of the cases. Poor function was noted in one in 10 that presented with a terrible triad. Conclusions: Resection of the radial head restored elbow functionality at a rate of 81%, which was a good outcome for patients.

• 한국임상수의학회지
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• 제18권2호
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• pp.156-159
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• 2001

A 6-year-old male mongrel dog with a 7-month history of ulnar-radial nonunion fracture was treated with implantation of recombinant human bone morphogenetic protein-2 (rhBMP-2). The dog had received surgical correction three times prior to the admission but radiography of the affected limb revealed a typical figure of nonunion fracture. Glossly, the fractured ends were sclerotic and the area between the ends was filled with fibrous tissue. After debridement the shaft was fixed by an 10-hole plate. rhBMP-2 at a total dose of 256 micrograms was implanted with a synthetic carrier into the 10-mm defect formed by the debridement. Callus formation responding to rhBMP-2 was radiographically observed at 4 weeks after implantation and the defect bridged both fracture ends by 8 weeks after implantation. The plate was removed at 12 months after implantation. Any complications were not observed for 5 months after removal of the plate.

• 한국정밀공학회지
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• 제12권2호
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• pp.5-13
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• 1995

Various techniques to measure fracture toughness which is an important parameter to predict fracture behavious of structural materials have been reported. Among these mathods, this paper describes the micro-Vickers indentation crack method to estimate the fracture toughness of some WC-Co composites. Two indentation crack patterns (such as radial-median cracks (orhalf-penny cracks) and Palmqvist cracks generated during indentation) are referred precisely. The fracture toughness of WC-4.7wt%Co, WC-6wr%Co and WE-9wr%Co composites were estimated by using some equations given by Shetty et al., Nihara et al. in this study. We show the reliability of indentation method by comparing the results with those from literatures. The appropriate equation to estimate the fracture toughness in the case of WC-Co composite is given. In addition, some technical informations in terms of the crack length by indentation in estimating the existence of the surface residual stress that prevents to obtain an accurate fracture toughness are presented.

• Clinics in Shoulder and Elbow
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• 제14권1호
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• pp.140-145
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• 2011

목적: 금속 요골두 치환술은 주관절 불안정성을 동반한 고정할 수 없는 분쇄된 요골두 골절의 치료로 최근 다양한 임플란트의 개발로 널리 사용되고 있다. 저자는 금속성 요골두 치환술의 적응증과 국내에 사용중인 임플란트의 종류와 수술 술기를 문헌 고찰과 함께 기술하고자 한다. 대상 및 방법: 요골두 치환술의 주 적응증은 동반된 연부조직 손상으로 인한 주관절의 불안정성이 있고, 요골두의 분쇄 골절로 안정적인 내고정이 불가능한 골절이다. 이러한 경우 과거 시행되었던 요골두 절제술은 많은 합병증의 발생으로 금기시되고 있다. 현재 국내에서는 양극성, 압박 고정 단극성 및 이완 고정 단극성 임플란트의 3종류가 수입되어 사용되고 있다. 요골두 치환술은 궁극적으로 원래의 요골두의 크기와 길이로 복원하는 것이 중요하다. 과도하게 긴 요골두의 삽입은 흔한 합병증으로 수술 시 주의가 필요하다. 결과 및 결론: 요골두 치환술은 적절한 적응증과 정확한 수술 술기로 만족할 만한 임상적 결과를 얻을 수 있다. 향후 장기추시 연구와 다양한 치환물들의 임상적인 비교 연구가 필요하다.

• 한국안전학회지
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• 제11권4호
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• pp.3-9
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• 1996

In this study, comparison of theoretical solutions with experimental results is examined through fracture conditions for the case of float glasses subjected static loading. The range of fracture generation limits and critical penetration energies are solved according to the impactor mass under the high velocity, and analytical method of fracture strength and penetration strength are presented. Also, fracture patterns are investigated according to impact velocities. The results obtained from this study are as follows ; 1) Radial cracks are generated from the loading point regardless of plate thickness in the case of the plate subjected to the static loading. In the case of high-speed impact, dimensions of ring cracks become to smaller and length of radial cracks becomes shorter with the rapidity of impact velocity. 2) Kinetic change volume of collision after/before is constant regardless of velocities over the range of critical penetration velocity. 3) Although the same impact energy is working, the critical penetration energy is increased with the shorter of impactor mass. 4) Although the same impact energy is working, the penetration fracture of lighter Impactor mass is generated more than that of heavier impactor mass, and the impulse of lighter impacter mass appear more than that of heavier impactor mass. Therefore, the penetration fracture in the case of greater impulse is generated earlier regardless of the of the dimensions of Impact loading.

• 열처리공학회지
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• 제7권3호
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• pp.199-205
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• 1994

The fracture characteristics and tool life of ceramics and WC, CBN cutting tool when turning heat treated steel STD11($H_RC$ 60) were investigated experimentally to clarify the machinability and optimum tool materials in cutting of difficult-to-cut material with high hardness. Forthermore, the behaviors of the tool wear and failure were examined with regard to cutting force. The hardened steel wore the cutting tool edge rapidily and increased the cutting forces, especially radial force. The tool was worn by the abrasive action. Flank Weat of $Al_2O_3-TiC$ ceramic and WC tool become relatively large and CBN & $Al_2O_3$, ceramic tool had a long life among the tool materials tested. The tool fracture patterns were just like minor cutting wear, flank wear, crater wear, notch wear, chipping. Flank wear rate was accelerated by occurrence of chipping. During the proceeding of machining, it was possible to foresee the catastrophic fracture of tool by abrupt increase of radial force.

• Clinics in Shoulder and Elbow
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• 제10권1호
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• pp.84-91
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• 2007

목적: 총 7예의 금속형 요골 골두 치환술을 경험하여 적응증을 바탕으로 국내 요골두 치환술의 실태와 필요성을 소개하고자 하였다. 대상 및 방법: 2006년 4월부터 고려대학교 정형외과 교실에서 경험하였던 총 7예의 환자를 대상으로 수술 적응증, 수술 소견 및 수술 후 상태를 조사하였다. 그리고 치환물의 술 전 준비상태와 보험 적용 여부를 조사하였다. 금속형 치환물은 양극성 유형의 요골두 치환물(Tornier SA. Saint-Ismier, France)을 사용하였다. 결과: 전 예에서 요골두 분쇄 골절 이외에 $1{\sim}2$ 곳의 다른 골절 및 연부조직 손상을 동반한 복합 손상으로 요골두 치환술의 적응증에 해당되었다. 요골두 골절은 Mason 분류상 III형이 3예, IV형이 4예였고 분쇄골절로 인해 만족할만한 내고정을 얻지 못해 치환술을 시행하였다. 술 후 평가에서는 우수 2예, 양호 4예, 불량 1예였고 추시 시 치환물의 문제로 인한 합병증은 보이지 않았다. 술 전 수술 기구의 공급 부족으로 2예에서 수술 날짜를 변경하였고 치환물에 대한 비용은 산재 환자 2예를 제외한 5예에서 환자 개인이 부담하였다. 결론: 요골 골두의 분쇄를 포함한 주관절의 복합 손상에서 금속형 치환물은 술 전 계획 하에 준비되어야 하며, 의료보험의 적용으로 의사 및 환자들의 치료 선택에 도움을 주어야 할 것으로 생각되었다.

• 소성∙가공
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• 제12권3호
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• pp.228-235
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• 2003

In this paper, the workability of flange in the radial extrusion is analyzed in terms of the deformation pattern, the punch load and the forming limit by using simulation and experiment. A single action pressing is applied to both simulation and experiment. The analysis in this study is focused on the transient extrusion into the gap in radial direction with various gap heights and die corner radius. Based on the surface strains where surface cracking occurs, the forming patterns and strain-fracture relationships in producing radially extruded flange are obtained.

• 한국임상수의학회지
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• 제33권2호
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• pp.135-137
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• 2016

A 6-month-old, weighing 2.8 kg, female, domestic short-haired cat presented with open fracture at right distal radius about a month ago. Based on radiological findings, hyperplasia at the right radioulna and left humerus was found. Results of the cytological examination were inflammatory reaction and reactive osteoblast. Distal radial ostectomy proceeded with necrotic bone debridement. Three weeks after operation, the radial bone lysis was seen on radiograph but clinical condition improved. Hyperplasia at the right radioulna and left humerus was dissolved. Two months after operation, she can use her both forelimbs despite right elbow have been diagnosed as arthrosclerosis because of periosteal reaction. Six months after operation, clinical symptoms of limbs were not detected. In this case, open fracture was treated through delayed surgical debridement procedure, therefore hematogenous osteomyelitis occurs at another forelimb. The longer a wound remains open, the more likely it is that infection will develop. The infection can occur to fracture bone and seed from hematogenous spread to another normal bone. In conclusion, when open fracture occurs, early antibiotic treatment and urgent surgical intervention are recommended.