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양측 대퇴골 전자하 내측에 발생한 부전 골절: 증례 보고
채동식 ( Dong Sik Chae ),이정한 ( Jung Han Lee ),이우석 ( Woo Suk Lee ),양익환 ( Ick Hwan Yang ),한창동 ( Chang Dong Han ) 대한고관절학회 2013 Hip and Pelvis Vol.25 No.3
외상력없이 발생한 불완전 부전 골절은 흔히 대퇴골 피질부의 외측에서 발견되는 반면 불완전 피로 골절은 내측에서 관찰되는데, 저자들은 외상력이나 약물 복용의 과거력없이 발생한 두 달간의 양측 대퇴부 내측부 통증으로 내원한 66세 여환으로 대퇴골 피질부의 내측을 침범하는 양측 전자하 부전 골절을 보고하는 바이다. A non-traumatic, incomplete insufficiency fracture commonly involves the lateral side of the femoral cortex; whereas a non-traumatic, incomplete stress fracture commonly involves the medial side of the femoral cortex. Here, we describe a case of a 66-year-old woman with a two-month history of bilateral thigh pain without trauma or medication usage who was diagnosed with bilateral subtrochanteric insufficiency fractures involving the medial side of the femoral cortex.
A Simplified Phenomenological Theory of Viscosity for Liquid Metals
김원수,채동식,Kim, Won Su,Chae, Dong Sik Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.1
This study simplifies the phenomenological theory of viscosity previously proposed by the present authors. This simplified theory has only two thermodynamic properties and one parameter, as opposed to its predecessor, which has many, allowing for easy calculation of the liquid viscosities. The viscosity of liquid metals, an excellent test for checking the validity of the liquid theory, can be calculated using the equation based on the simplified theory. The calculated results by the current theory turn out to be good for the liquid metals, including sodium, potassium, rubbidium, cesium, lead and mercury.
머신러닝 기반 무릎 골 관절염 심각도 분류를 위한 특징 중요도 분석
신영철,김성우,채동식,유선국 대한전자공학회 2020 전자공학회논문지 Vol.57 No.2
In this study, the OsteoArthritis Initiative(OAI) dataset was used to evaluate four statistical methods to determine the importance of 6 clinical information and 18 X-ray image features for knee osteoarthritis severity classification. The Kellgren-Lawrence Grade, knee osteoarthritis seveirity classification scoring system was classified using a random forest method which used features of high importance. Joint space narrowing, osteophytes, and osteoosclerosis were ranked in the top five most important features in all methods. The model using 24 features had a balanced classification accuracy of 93.7%, while the model using 12 features including clinical information, joint space narrowing, and osteophytes, had a balanced classification accuracy of 93.4%. Both models had similar levels of accuracy, but calculation cost to obtain image features of the second model was lower than the first model. It used one-thirds of features of the first model and required the use of only 6 image features compared to the first methods required use of 18 image features. 이 논문에서는 골관절염 이니셔티브 (The OsteoArthritis Initiative, OAI) 데이터 셋을 사용하여 4가지 통계학적 방법으로 무릎 골 관절염 심각도 분류와 관계된 6가지의 임상정보와 18가지 X-ray영상 특징들의 중요성을 평가하였다. 또한, 중요도가 높게 평가된 특징들을 활용하여 무릎 골 관절염 심각도 분류 점수체계인 Kellgren-Lawrence Grade(K-L Grade)를 머신러닝 방법 중 하나인 Random Forest로 분류하였다. 특징 중요도 평가 결과로는, 관절간격감소(Joint Space Narrowing, JSN), 골극(Osteophytes, OS), 골 경화증(Osteosclerosis, SC)이 모든 특징 중요도 평가 방법에서 상위 5위를 이상을 차지하였다. 심각도 분류 결과로는, 24가지 전체 특징을 사용한 모델의 분류 정확도가 93.7%, 임상 정보, JSN 및 OS를 포함하는 12가지 특징을 활용한 모델의 정확도는 93.4%로 나타났다. 영상학적 특징들을 18개에서 1/3인 6개로 감소시킨 두 번째 모델은, 영상학적 특징을 얻기 위한 계산 비용은 더 적지만, 정확도는 전체 특징을 활용한 모델의 정확도와 유사하였다.
조우람,이우석,채동식,양익환,이경민,구경회 대한의학회 2016 Journal of Korean medical science Vol.31 No.10
Subchondral insufficiency fracture (SIF) of the femoral head occurs in the elderly and recipients of organ transplantation. Osteoporosis and deficient lateral coverage of the acetabulum are known risk factors for SIF. There has been no study about relation between spinopelvic alignment and anterior acetabular coverage with SIF. We therefore asked whether a decrease of lumbar lordosis and a deficiency in the anterior acetabular coverage are risk factors. We investigated 37 patients with SIF. There were 33 women and 4 men, and their mean age was 71.5 years (59-85 years). These 37 patients were matched with 37 controls for gender, age, height, weight, body mass index and bone mineral density. We compared the lumbar lordosis, pelvic incidence, pelvic tilt, sacral slope, acetabular index, acetabular roof angle, acetabular head index, anterior center-edge angle and lateral center-edge angle. Lumbar lordosis, pelvic tilt, sacral slope, lateral center edge angle, anterior center edge angle, acetabular index and acetabular head index were significantly different between SIF group and control group. Lumbar lordosis (OR=1.11), lateral center edge angle (OR=1.30) and anterior center edge angle (OR=1.27) had significant associations in multivariate analysis. Decreased lumbar lordosis and deficient anterior coverage of the acetabulum are risk factors for SIF as well as decreased lateral coverage of the acetabulum.
이진웅,이우석,김상범,허윤무,채동식 대한골대사학회 2014 대한골대사학회지 Vol.21 No.4
Background: The aim of this in vitro study was to determine the effect of zoledronate,which is frequently used to treat osteoporosis, on osteoarthritis by analyzing zoledro-nate-induced expression of vascular endothelial growth factor-A (VEGF-A) in chondro-cytes and synovial cells. Methods: After chondrocytes and synovial cells were separatedand cultured, zoledronate was added, and VEGF-A and pigment epithelium-derived fac-tor (PEDF) expression were quantified by real-time polymerase chain reaction and West-ern blotting. Results: There was no significant difference in the expression of VEGF-AmRNA in chondrocytes between the zoledronate group and the control group on the8th day of culture. The expression of both VEGF-A and PEDF mRNA in synovial cells wassignificantly decreased in the zoledronate group (P<0.05). Conclusions: Zoledronatedecreases the expression of VEGF-A in synovial cells and may affect the developmentand progression of osteoarthritis.
골반 X-ray 영상에서의 대퇴골두 무혈성 괴사의 Normative Modeling
정조은(Joeun Jeong),박재석(Jaeseok Park),채동식(Dongsik Chae),신태훈(Taehoon Shin) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
In this paper, we introduce a normative modeling method using X-ray images to distinguish stages of osteonecrosis of the femoral head (ONFH). For ONFH, caused by impaired blood flow, early treatment is important. MRI is effective but expensive and less accessible, while X-ray imaging is more accessible but struggles with early-stage diagnosis. The proposed method uses a U-Net model and a modified autoencoder for femoral head segmentation to learn normal femoral head features. Through the proposed model, we compare and analyze the distribution of ONFH by grade in latent space.
Diagnosis and Treatment of Inflammatory Joint Disease
김이석,오현철,박장원,김인성,김준영,김기철,채동식,조우람,송주현 대한고관절학회 2017 Hip and Pelvis Vol.29 No.4
Arthritis damages the cartilage within joints, resulting in degenerative changes, including loss of function and joint instability. Ankylosing spondylitis (AS) is a chronic inflammatory condition affecting the spine and boneto-tendon attachment area within the sacroiliac joint leading to back pain and progressive spinal stiffness. In the final stages, AS causes hyperkyphosis-a condition closely tied to the human leukocyte antigen-B27 gene. Rheumatoid arthritis is a chronic, systemic autoimmune disease characterized by the simultaneous inflammation of the synovium of multiple joints, leading to joint damage (e.g., destruction, deformation and disability). In the past, nonsteroidal anti-inflammatory drugs or conventional disease-modifying antirheumatic drug (DMARDs) have been used for the treatment of these autoimmune diseases, but biologic DMARDs have recently been introduced with excellent results. Gout is a chronic inflammatory disease that causes an alteration of joints resulting in severe pain. Specifically, gout is associated with an accumulation of uric acid within the body resulting from dysregulated purine metabolism, causing recurrent paroxysmal inflammation in the joints. Allopurinol and febuxostat are the primary treatment options for individuals with gout. It is necessary to have an accurate understanding of the pathogenesis, pathological ecology and treatment of AS, rheumatoid arthritis, and gouty arthritis, which are the representative diseases that may cause inflammatory arthritis.