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천동일,Chun, Dong-il 대한족부족관절학회 2020 대한족부족관절학회지 Vol.24 No.1
Metatarsalgia is a generalized term used to describe forefoot pain. The possible etiologies can range from direct to indirect pathologies. Metatarsalgia has several causes. This paper evaluates the recent literature to provide an in-depth review of metatarsalgia after forefoot surgery.
천동일,김성민,윤상철,김용재,구동억,최인호 대한족부족관절학회 2015 대한족부족관절학회지 Vol.19 No.1
Arteriovenous malformations (AVMs) are characterized by the presence of abnormal connections between feeding arteries and draining veins. It is generally assumed that symptomatic lesions can preferably be treated. Due to high arterial blood flow, there is a risk of bleeding with surgical excision alone, which can be massive and life threatening during the operation. According to recent advances in interventional technique, a hybrid approach using embolization of the feeding artery with subsequent immediate excision of the AVM for successful management of vascular lesions could be applied to AVMs. Herein, we describe a case of successful excision of AVM in the left soleus muscle using a hybrid approach
종골 길이와 너비의 상관관계를 이용한 종골 너비 추정에 관한 연구
천동일,황수강,조재호,최성우,김용범,원성훈,Chun, Dong-il,Hwang, Shu Chiang,Cho, Jae-ho,Choi, Sung-Woo,Kim, Yong Beom,Won, Sung Hun 대한족부족관절학회 2017 대한족부족관절학회지 Vol.21 No.2
Purpose: The purpose of this study was to determine the correlation and ratio between the calcaneal length and width for predicting the width of calcaneus. Materials and Methods: A total of 190 feet (190 patients) were included based on computed tomography scans. The length of calcaneus (CL) was measured on the line connecting the center of a circle tangent to the cortical margin in the anterior and posterior parts of the calcaneus in a sagittal plane (W1, W2). The width of the calcaneus was defined as the horizontal line of each part (W1, W2, W3) on the same axial plane. The relationship between the measurement was determined through a correlation analysis. The reliability was assessed based on intraclass correlation coefficients. Results: The CL and widths of calcaneus (W1, W2, W3) had a good positive correlation (r=0.848 [W1/CL], r=0.738 [W2/CL], r=0.769 [W3/CL]; p<0.001). The mean CL and widths ratios were 0.33 (W1/CL), 0.37 (W2/CL), and 0.37 (W3/CL). Using these ratios to estimate the widths by multiplying each ratio by the measured calcaneal length, we found a difference between the estimated calcaneal widths and the actual measured calcaneal widths values was 0.25 mm, 0.43 mm, and 0.16 mm. All measurements showed good-to-excellent inter- and intraobserver reliability. Conclusion: This study analyzed the correlation and ratio between the length and width of the calcaneus. The results will help orthopedic surgeons fixate screws in a stable manner to prevent iatrogenic injuries to the medial neurovascular structures of the calcaneus.
천동일,민태홍,조재호,원성훈,손정인,이영 대한골대사학회 2021 대한골대사학회지 Vol.28 No.3
Background: This study aimed to analyze the correlation between bone mineral density (BMD) and the type of 5th metatarsal fracture, as well as to demonstrate whether there is a difference in radiological findings (heel alignment angle [HAA], heel moment arm [HMA], and metatarsus angle) between fracture types. Methods: A total of 87 patients were enrolled in the study and allocated into 3 groups: the Zone 1 group (N=36), the Zone 2 group (N=33), and the Zone 3 group (N=18). The participants’ demographic data, T-scores, existing fracture or osteoporosis medications, and radiologic parameters including HAA, HMA, and metatarsus adductus angle were analyzed and compared. Results: There was a significant difference between the mean age of the participants, with the highest age in the Zone 1 group and the lowest in the Zone 3 group. Regarding the history of concurrent fracture or osteoporosis medications, there was no significant difference between the 3 groups. Similarly, no significant difference was observed between the 3 groups about the BMD values. In contrast, the HAA was statistically significant in all groups with a positive correlation of -8.9 in the Zone 1 group, a negative correlation of 3.55 in the Zone 2 group, and an inverse relationship of 6.1 in the Zone 3 group. The metatarsus adductus angle was significantly higher in the Zone 3 group than the Zone 1 and Zone 2 groups. Conclusions: The location of a 5th metatarsal bone fracture is not significantly associated with BMD. However, mechanical influences, such as hindfoot varus or forefoot adductus, have a significant correlation with fracture types.
당뇨병성 족부 궤양 환자의 진단 1년 내의 절단율 및 위험 인자의 분석
천동일,전민철,최성우,김용범,노재휘,원성훈,Chun, Dong-Il,Jeon, Min Chul,Choi, Sung-Woo,Kim, Yong-Beom,Nho, Jae-Hwi,Won, Sung Hun 대한족부족관절학회 2016 대한족부족관절학회지 Vol.20 No.3
Purpose: This study investigates the amputation rate within 1 year after the diagnosis of diabetic foot ulcer and its associated risk factors. Materials and Methods: This study enrolled 60 patients with diabetic foot ulcer. The mean and standard deviation age was $64.4{\pm}12.8years$ (range, 32~89 years); the mean and standard deviation prevalence period for diabetes mellitus was $21.0{\pm}7.5years$ (range, 0.5~36 years). The amputation rate was evaluated by dividing the subjects into two groups - the major and minor amputation groups - within 1 year following the initial diagnosis of diabetic foot ulcer. Multivariate Cox proportional hazards regression analysis was used to identify the risk factors for amputation. Results: The total amputation rate of 38.3% (n=23) was comprised of the amputation rate for the major amputation group (10.0%) and rate for the minor amputation group (23.8%). There was a high correlation between peripheral artery disease (toe brachial pressure index <0.7) and amputation (hazard ratio [HR] 5.81, confidence interval [CI] 2.09~16.1, p<0.01). Nephropathy was significantly correlated with the amputation rate (HR 3.53, CI 1.29~9.64, p=0.01). Conclusion: Clinicians who treat patients with diabetic foot complications must understand the fact that the amputation rate within 1 year is significant, and that the amputation rate of patients with peripheral artery disease or nephropathy is especially high.
천동일,원성훈 대한족부족관절학회 2018 대한족부족관절학회지 Vol.22 No.1
Ankle arthrodesis is a common and standard treatment for patients with end-stage ankle arthritis. The surgical goals of ankle arthrodesis are to obtain bony union between the tibia and talus with adequate alignment, and provide a pain-free plantigrade foot for weightbear- ing activities. To achieve successful fusion, the surgeon should closely examine the patient’s factors before surgery, particularly the fol- lowing: adjacent arthritis and deformity, infection, avascular necrosis of talus, Charcot arthropathy, and rheumatoid arthritis. Recently, ankle arthroplasty has been reported to provide satisfactory clinical results. On the other hand, long-term follow-up results are still lacking, and considering the various complications of arthroplasty, ankle arthrodesis is still the primary surgical treatment for advanced arthritis of the ankle joint.
천동일 대한체질인류학회 2021 대한체질인류학회 학술대회 연제 초록 Vol.64 No.-
기본적으로 정형외과의 진단과 치료에 있어서 해부학에 대한 중요성은 아무리 강조하여도 지나침이 없다. 따라서 이러한 해부학적 구조물들을 자세히 그리고 간단하게 파악하기 위한 노력들은 예전부터 지속되어 왔고 결과 현재의 여러 가지 영상 진단장치들이 만들어졌다. 이 중에서도 초음파 진단 장치의 경우 환자에게 피해를 주지 않을 뿐만 아니라 역동적인 변화를 확인할 수 있어 중요성이 대두되고 있다. 여기서는 Foot and Ankle에서 자주 볼 수 있는 병변 위주로 중요한 해부학적 구조물에 대해서 알아본다.
스포츠 손상에 의한 아킬레스건의 급성 분절 파열: 증례 보고
천동일,원성훈,이상현,조재호,Chun, Dong-Il,Won, Sung Hun,Lee, Sang Hyeon,Cho, Jaeho 대한족부족관절학회 2017 대한족부족관절학회지 Vol.21 No.2
Tendoachilles rupture has recently seen an increase in frequency, accounting for up to 40% of all tendon ruptures. However, an acute segmental rupture of the Achilles tendon is very rare with only one case caused by predisposing factors, such as steroid injection. In this report, we highlight an unusual clinical presentation of a segmental rupture of the Achilles tendon without any underling predisposing factor and without direct trauma. Herein, we discuss its mechanism. Twelve months after surgical repair with open technique, this patient became fully functional again in daily activity.
다양한 경계층 유동을 고려한 개방형 대공간 지붕 구조물의 외장재 설계용 피크순압력계수 제안
천동진(Cheon, Dong-Jin),김용철(Kim, Yong-Chul),윤성원(Yoon, Sung-Won) 대한건축학회 2024 대한건축학회논문집 Vol.40 No.2
The wind pressure characteristics of open large-span roofs under various boundary layer flow variations were investigated based on wind tunnel tests, and a peak pressure coefficient model was derived for cladding design. First, the characteristics of wind pressure under smooth flow and various turbulent boundary layer flows were analyzed in detail. It was found that the wind loads acting on the roof increased with the increase in turbulence intensity under various flow conditions. Then the changes in peak pressure coefficients were carefully checked with variations in turbulence intensity, and comparisons were made with the proposed values from previous study. Finally, based on turbulence intensity, a model for peak pressure coefficients was proposed, it can be applied to the cladding design of open large-span roofs
[디젤엔진부문] 고압 디젤 인젝터의 분무 구조 및 발달 과정
천동원(Dongwon Cheon),이창식(Changsik Lee),이기형(Kihyung Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
An experimental study was performed to investigate the macroscopic spray structure and development process of the fuel spray for the high-pressure injector of a common mil type diesel engine. The global spray structure of the high-pressure diesel injector was investigated when fuel was injected for various injection pressures and ambient pressures. The spray tip penetration, spray width and spray angle of the high-pressure diesel injector with the variation of time were linearly proportional to the elapsed time and injection pressure, were in inversely proportional to ambient pressure. The spray behavior of the high-pressure diesel injector was visualized by shadowgraph technique