• Journal of the Korean Orthopaedic Association
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• v.54 no.1
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• pp.37-44
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• 2019

Purpose: Tumor infiltration around the knee joint or skip metastasis, repeated infection sequelae after tumor prosthesis implantation, regional recurrence, and mechanical failure of the megaprosthesis might require combined distal femur and proximal tibia replacement (CFTR). Among the aforementioned situations, there are few reports on the indication, complications, and implant survival of CFTR in temporarily arthrodesed patients who had a massive bony defect on either side of the knee joint to control infection. Materials and Methods: Thirty-four CFTR patients were reviewed retrospectively and 13 temporary arthrodesed cases switched to CFTR were extracted. All 13 cases had undergone a massive bony resection on either side of the knee joint and temporary arthrodesis state to control the repeated infection. This paper describes the diagnosis, tumor location, number of operations until CFTR, duration from the index operation to CFTR, survival of CFTR, complications, and Musculoskeletal Tumor Society (MSTS) score. Results: According to Kaplan-Meier plot, the 5- and 10-year survival of CFTR was 69.0%±12.8%, 46.0%±20.7%, respectively. Six (46.2%) of the 13 cases had major complications. Three cases underwent removal of the prosthesis and were converted to arthrodesis due to infection. Two cases underwent partial change of the implant due to loosening and periprosthetic fracture. The remaining case with a deep infection was resolved after extensive debridement. At the final follow-up, the average MSTS score of 10 cases with CFTR was 24.6 (21-27). In contrast, the MSTS score of 3 arthrodesis cases with failed CFTR was 12.3 (12-13). The average range of motion of the 10 CFTR cases was 67° (0°-100°). The mean extension lag of 10 cases was 48° (20°-80°). Conclusion: Although the complication rates is substantial, conversion of an arthrodesed knee to a mobile joint using CFTR in a patient who had a massive bony defect on either side of the knee joint to control infection should be considered. The patient's functional outcome was different from the arthrodesed one. For successful conversion to a mobile joint, thorough the eradication of scar tissue and creating sufficient space for the tumor prosthesis to flex the knee joint up to 60° to 70° without soft tissue tension.

• Journal of the Korean Arthroscopy Society
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• v.16 no.2
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• pp.190-194
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• 2012

The role of arthroscopy for the diagnosis of polyethylene wear after total knee arthroplasty has been reported previously. In this report, we demonstrate a case of wear of meniscal bearing in unicompartmental knee arthroplasty (UKA) and recurrent meniscal bearing subluxation which was diagnosed by arthroscopy. Arthroscopic examination has its role in diagnosing the wear and subluxation of polyethylene bearing after UKA.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.62-62
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• 2010

인공관절은 노인성 질환이나 자가 면역질환, 신체적인 외상 등에 의한 관절의 손상 부위를 대체하기 위해 고안된 관절의 인공대용물로써 최근 인구의 고령화와 질병, 사고의 증가에 따라 그 수요가 급격히 증가하는 추세를 보이고 있다. 인공관절의 소재로는 현재 metal-on-polymer(MOP) 소재가 가장 많이 사용되고 있는데, metal 소재로서는 Co-Cr계 합금이, polymer 소재로서는 초고분자량 폴리에틸렌 (ultra high molecular weight polyethylene) 이 주로 사용되고 있다. MOP 소재의 경우 충격흡수의 장점이 있는 반면 wear debris에 의한 골용해로 인해 관절이 느슨해지는 문제점이 발생하여 재시술의 주요 원인이 되고 있다. 또한 metal 소재로 주로 사용되고 있는 Co-Cr계 합금의 경우 인공관절의 마모, 부식 현상에 의해 Co, Cr등이 체내에 용출되어 세포독성의 문제를 일으킬 수 있다는 단점을 가지고 있다. 본 연구에서는 고체원소 이온주입 기술을 이용하여 316L stainless steel 기판에 niobium을 이온 주입 한 후 niobium nitride (NbN) 박막을 증착하여 counterpart 소재인 초고분자량 폴리에틸렌(UHMWPE) 의 마모를 줄이는 실험을 진행하였다. Pin-on-disk tribometer를 통해 마모 테스트를 진행하여 NbN 박막의 내마모특성을 평가하였으며, 박막의 결정구조 및 화학적 특성을 평가하기 위해 XRD, AES 분석을 수행하였다. 또한 박막의 경도와 표면조도를 측정하기 위해 micro hardness tester, AFM을 이용하였다.

• Journal of Veterinary Clinics
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• v.31 no.2
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• pp.121-124
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• 2014

A 7-year-old, intact female Jindo dog was presented for assessment of weight-bearing lameness of the right hindlimb. On physical examination, crepitus and pain was noted in the right coxofemoral joint upon extension. Radiographs revealed a craniodorsal luxation of the right coxofemoral joint and degenerative joint disease (DJD) of both coxofemoral joints. Total hip replacement (THR) was performed for the right coxofemoral joint. Intraoperatively, dorsal acetabular rim (DAR) deficiency was noted, which can be related to a high risk for acetabular cup implant dislocation. Deficiency of the dorsal acetabular rim realigned with the acetabular cup using universal locking plate (ULP) and polymethylmethacrylate (PMMA) bone cement. After surgery, the patient had an uneventful course and a successful outcome. The ROM and thigh girth were dramatically improved. There were no complications associated with prosthesis implants. Hip luxation with dorsal acetabular rim deficiency in a dog was successfully repaired with THR and dorsal acetabular rim augmentation using ULP and PMMA bone cement. This technique should be considered when conventional THR is precluded by dorsal acetabular rim deficiency.

• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.473-477
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• 2007

Industry for artificial joint is a complex one based on various technologies, including mechanics, biotechnology, material engineering, and medicine which are connected closely. This industry has been already known to a higher value-added business, and as going into an aging society, is expected a market growth. Also, it is a knowledge based component industry and each components assembled into product is almost all import items. This characteristics made many small and medium and venture enterprises participate in this area. For these reasons, it is needed a government's promotion. In this study, commercialization environment was analyzed and then commercialization items and strategies was figured out. Firstly, three factors for need, environment, technology were analyzed and then growth drivers growth restraints were provided. Secondly, items and strategies for commercialization were analyzed based on needs and trends of technology. Commercialization opportunities are expected to be created based on strategies following as; building a integrated technology development system, making a public opinion, strengthening a marketing, entering into niche market, B2B strategies etc.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2008.03a
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• pp.50-50
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• 2008

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1989.11a
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• pp.1-15
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• 1989

바이오트라이보로지(biotribology)란 생물학(biology)와 마찰학(tribology)의 합성어로서 그리이스어의 $\tau\rhoc\betao\sigma$(마찰하다)가 어원이며, 마찰 마모 윤활의 학술 용어 "tribology"가 영어로 된것은 1966년이다. 이때 마찰학이란 이학 또는 공학현상으로서 문제를 해석하는데 한정하였고 생물에 대한 문제까지 광범위하게 고려하지 못하였다. 1972년 영국 석유학회, 기계학회 그리고 Rheology 학회의 공동개최로 "윤활제의 레올로지" 회의가 열렸다. 거기서 Dowson 교수(기계공학)와 Right 교수(루마치스 의학)의 공동논문 "Bio-Tribology"를 발표해서 처음으로 그 용어를 제안하였다. Dowson 교수가 열거했던 바이오트라이보로지의 대상은 다음과 같다. (1) 기계에 사용되는 윤활제에 대한 미생물의 영향 (2) 인간의치의 마모 (3) 면도칼에 대한 저마찰 보호막의 작용 (4) 인체내의 유체수송(뇨관내의 유동기구, 타액의 운동, 혈액흐름) (5) 모세혈관내에서 적혈구의 운동과 혈장에서 그의 윤활작용 (6) 화상치료시 "정압기체 축수"적 부양 (7) 음식물을 씹을 때 타액의 윤활작용 (8) 관절기능의 윤활학적 연구 (9) 인공골두와 인공관절의 윤활학적 연구8) 관절기능의 윤활학적 연구 (9) 인공골두와 인공관절의 윤활학적 연구

• 월간 기계설비
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• no.10 s.183
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• pp.99-100
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• 2005

등산은 누구나 손쉽게 즐기는 국민 스포츠이다. 그러나 생각만큼 간단한 운동은 아니다. 의욕만 앞세우다 자칫 발목이나 무릎 관절에 무리를 줄 수 있으며, 심한 경우 관절이나 관절 주변 조직이 찢어져 수술을 받아야 한다. 관절이나 주변 조직의 부상은 만성 관절염으로 연결되기 쉬우며, 만성 관절염은 노후 인공관절 수술을 받게 되는 가장 큰 원인이 된다. 이번 호에서는 등산으로 인한 근육∙골격계 질환에 대해서는 알아보기로 한다. 이 내용은 동아일보에 게재된 내용을 발췌 정리한 것이다.

• 대한관절경학회:학술대회논문집
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• 2009.10a
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• pp.93-98
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• 2009

족관절 고정술은 족관절에 발생한 심한 관절염(end-stage arthritis)에서 전통적으로 시행하던 술식으로 현재 사용되고 있는 인공 족관절 치환술이 발달되기 전까지는 gold standard 로 알려져 있었으며 현재에도 심한 족관절의 변형이나 파괴, 족관절 인공 관절의 실패시에 시행되고 있다. 1897년 Albert가 처음으로 족관절 고정술을 소개한 이후로 30여가지가 넘는 방법이 행해지고 있으나 개방적 관절 고정술의 단점인 수술 후 염증, 유합 지연, 연부조직의 손상에 의한 피부 괴사 등을 극복하고 유합물을 높이기 위해 다양한 내고정 및 외고정 장치를 사용하고 있다. 관절경 술식이 발달하면서 Schnider가 1983년 최초로 관절경을 이용한 족관절 고정술을 발표한 이후로 관절경하의 족관절 고정술은 개방적 족관절 고정술 보다 높은 유합율과 적은 수술 합병증으로 인해 관심의 대상이 되었지만 족관절의 변형이 심한 경우에는 시행하기 어려운 단점이 있는 것으로 알려져 왔다.

• Journal of the Korean Society of Radiology
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• v.12 no.1
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• pp.107-114
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• 2018

Long-term complications such as loosening, wear, osteolytic lesion and granulomatous reaction by foreign bodies can occur, after total hip arthroplasty. The implantation alignment effects dislocation and wear, according to its amount and direction. Wear particles in total hip arthroplasty brings about biochemical complications such as osteolysis or send wear. In this sense, it is important to regularly check wear and alignment of total hip replacement. Because the wear in followup of 10 years may remain in a small amount, like a 1 or 2 mm generally, somewhat precise measurement tool has to be established. The wear and alignment measurement softwares commercially available currently lack in project saving or reproducibility. This study suggests a reliable method for the measurement using an X-ray image and a CAD software. The proposed method can be executed only if having a CAD software under most of current general clinical radiographical environment. The proposed was revealed through tests for the method to have accuracy of 0.06 mm with precision of 0.05 mm for wear measurement, and precision of 0.27 degrees for tilt measurement.