• Title, Summary, Keyword: Radius fracture

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Evaluation of Critical Notch radius using Notch/Crack Critical Average Stress Fracture Model (노치/균열 임계평균응력 파손모델을 이용한 임계노치반경 평가)

  • 김재훈;김덕회;김기수;안병욱
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1358-1361
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    • 2003
  • In this study, intrinsic static/dynamic fracture toughness of Al 7175-T74 are evaluated from the apparent static/dynamic toughness of notched specimen. The notch/crack critical average stress fracture model is suggested to establish the relationship to predict the intrinsic fracture toughness from the apparent fracture toughness of a notched specimen. The notch/crack critical average stress fracture model is established using the relation between the notch root radius and the effective distance calculated by finite element analysis. It is conclude that the true fracture toughness can be estimated from test results of apparent fracture toughness measured by using a notched specimen. Also, critical notch root radius can be predicted by notch/crack critical average stress fracture model.

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Evaluation of Fracture Healing in Canine Radius by Bone Scan with $^ {99m}Tc-MDP$ ($^ {99m}Tc-MDP$를 이용한 개의 요골 골절 치유 과정의 평가)

  • 김남수
    • Journal of Veterinary Clinics
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    • v.16 no.2
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    • pp.293-299
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    • 1999
  • Bone scintigraphy with $^{99m}Tc-methylene$ diphosphonate(MDP) performed for 20 weeks per two weeks interval respectively after fracture in seven(male 3 heads, female 4 heads) canine radius were analysed. All of bone scans performed 2 weeks to 20 weeks after fracture showed increase in generalized tracer uptake and showed localized increase in tracer uptake at the fracture site. Bone scans and ratio performed 6 weeks after fracture showed the most outstanding increase in generalized and localized tracer uptake. New bone formation had been observed from 2 weeks and they were incorporated completely on 18 weeks, they showed most activity during 6-10 weeks after fracture. It was recognized that the bone scan with $^{99m}Tc-methylene$ was quite sensitivity but low specificity on the fracture healing in canine radius.

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Acute Rupture of Extensor Pollicis Longus Tendon after Distal Radius Fracture: A Case Report (요골 원위부 골절 후 발생한 급성 장무지 신전건 파열 -1예 보고-)

  • Hwang, Jung Chul;Chung, Duke Whan
    • The Journal of Korean Orthopaedic Ultrasound Society
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    • v.4 no.1
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    • pp.24-27
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    • 2011
  • Late rupture of the extensor pollicis longus (EPL) tendon is an occasional complication following a distal radius fracture. Early rupture of the EPL tendon as a complication of distal radius fracture is rare. We report one case of early rupture of the EPL tendon after distal radius fracture.

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Dynamic Crack Initiation of 17-4PH Casting Steel for Various Notch Radius (다양한 노치 반경을 갖는 17-4PH강의 동적균열개시 특성)

  • 박성욱;김덕회;김재훈;문순일
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.160-163
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    • 2003
  • In this study, intrinsic dynamic fracture toughness of 17-4PH casting steel is evaluated from the apparent dynamic fracture toughness of notched specimen. Notch radius of notched specimen is manufactured from 0.1mm to 4mm. The results shows that dynamic fracture toughness decreases with decreasing of notch root radius above critical notch roof radius. The true dynamic fracture toughness can be predicted from test results of apparent dynamic fracture toughness measured by using notched specimen.

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Notch Radius Effect for Static Fracture Toughness of Al 7175 Alloys (Al 7175 합금의 정적 파괴인성에 미치는 노치반경 영향)

  • 김재훈;김덕회;박성욱;문순일
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.84-87
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    • 2002
  • In this study, intrinsic fracture toughness of Al 7175-T74 is evaluated from the apparent toughness of notched specimen. Modified average stress model is used to establish the relationship to predict the intrinsic fracture toughness from the apparent fracture toughness of a notched-cracked specimen. The modified average stress model is established the relation between notch radius and effective distance calculated by FEM analysis. The results show that fracture toughness decreases with decreasing of notch root radius. The true fracture toughness can be predicted from test results of apparent fracture toughness measured by using notched specimen.

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Microscopic fracture criterion of crack growth initiation (연성 균열성장 개시의 미시적 파괴조건)

  • 구인회
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.11 no.5
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    • pp.740-745
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    • 1987
  • For the prediction of the crack growth initiation from a blunt notch or a precrack in a prestrained material under plane strain tension and small-scale yielding conditions, a microscopic fracture criterion is proposed in terms of the crack tip opening displacement(COD) needed for the attainment of fracture strain at a microstructural distance. Smooth blunting of a crack tip with an initial root radius is assumed, and strain distributions on the crack-line axis are calculated at each deformation stage until the distributions against an original distance normalized to the COD are insensitive to an initial root radius. This case of no initial-root-radius effect is taken as for a sharp crack tip, on which the criterion is applied to determine the characteristic length of material from a critical COD for a fatigue-precracked specimen. The predicted COD at the fracture initiation from a crack with an initial root radius or a prestraining shows reasonable agreement with experimental values.

The Clinical Effect of Rehabilitation Protocol for Distal Radius Fracture in Korean Medicine: A Report of 3 Cases (원위 요골 골절에 대한 한방 재활치료 프로토콜 적용의 임상적 효과: 증례 보고)

  • Ha, Won-Bae;Geum, Ji-Hye;Koh, Nak-Yong;Lee, Jung-Han
    • Journal of Korean Medicine Rehabilitation
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    • v.28 no.3
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    • pp.97-106
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    • 2018
  • The objective of this study was to propose a rehabilitation protocol for distal radius fracture in Korean Medicine and to report its effectiveness. Three patients who had undergone distal radius fracture were treated using the rehabilitation protocol in Korean Medicine. We estimated the outcome evaluating physical examination findings of the wrist joint, numeric rating scale and quick the Disabilities of the Arm, Shoulder and Hand (DASH) score. After the treatment, we observed that wrist movement, numeric rating scale and quick DASH score were improved. A rehabilitation in Korean Medicine can be effectively used for distal radius fracture patients. The limitation of this study was the insufficient number of cases. Further studies are needed to design a rehabilitation protocol in Korean Medicine.

Minimally Invasive Plate Osteosynthesis of Radius-Ulna Fracture using Circular External Fixator in a Dog

  • Kwon, Yong-hwan;Kang, Jin-su;Kim, Young-ung;Cho, Hyoung-sun;Lee, Ki-chang;Kim, Nam-soo;Kim, Min-su
    • Journal of Veterinary Clinics
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    • v.34 no.1
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    • pp.47-49
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    • 2017
  • Fracture stabilization techniques continue to evolve and provide approaches that minimize the iatrogenic trauma associated with surgical procedures. Minimally invasive plate osteosynthesis (MIPO) is a recently described method of biological internal fixation performed by introducing a bone plate via small insertional incisions that are remote to the fracture site. Indirect reduction techniques can generally be utilized when performing MIPO. In this case report, we describe MIPO of a radius-ulna fracture by indirect reduction using circular external fixation for alignment and distraction in a dog.

Delayed Rupture of Flexor Pollicis Longus by Plate for Fracture of the Distal Radius (요골골절에 사용된 금속판에 의한 장무지 굴곡건의 지연성 파열)

  • Hwang, So-Min;Ahn, Sung-Min;Oh, Kyoung-Seok;Kim, Jin-Hyeong;Lee, Jun-Ho
    • Archives of Plastic Surgery
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    • v.35 no.6
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    • pp.751-754
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    • 2008
  • Purpose: Delayed rupture of flexor pollicis longus as a sequelae of the plate inserted for distal radius fracture is a very rare. This is the first case reported and published in Korea. Methods: A 48 years old female patient visited hospital, complaining flexor disturbance of interphalangeal joint of left thumb, which suddenly occurred without any external wound. We found that she had received operation of fixing plate for fracture of left distal radius 10 years ago. As operational opinion, we have checked that flexor pollicis longus tendon has been ruptured with oblique ways being stimulated by extended plate to palmar side over long period. Results: Authors performed tenorrhaphy of flexor pollicis longus without tendon graft and presented a successful active flexion of the left thumb interphalangeal joint 1 year after the operation. Conclusion: If the extruded part of the end plate is observed during the operation or follow-up, it is considered to be necessary to get rid of the plate as early as possible after the fracture healing.

A Study on the Proper Fillet Shape in Fracture Mechanical Aspect (파괴역학적 관점에서의 적정 필렛 형상에 관한 연구)

  • Kim, Chul;Yang, Won-Ho;Cho, Myoung-Rae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.7
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    • pp.214-220
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    • 1999
  • In order to use effectively a machinery part with fillet, it is necessary to determine a proper fillet shape in design step, Study of such problem by fracture mechanical criterion is rare. So, this paper focuses on the design of fillet radius in fracture mechanical aspect. Finite element method was used to obtain crack tip stress intensity factor. Stress intensity factor was calculated by COD(crack opening displacement0method proposed by Ingraffea and Manu. The parameter used in this study are thickness ration, filet radium and crack length . If fillet radius increase , crack propagation may be accelerated. Critical crack length is inversely proportional to fillet radius.

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