[기업탐방 및 연구실탐방] 주식회사 네오에너지커넥터

최의성 한국태양에너지학회 2022 태양에너지 : 한국태양에너지학회지 Vol.20 No.2

만성 전방 십자 인대 파열의 반흔 형성

최의성,원중희,김용민,서중배,이호승,이신노,Choi Eui-Seong,Won Choong-Hee,Kim Yong-Min,Seo Joong-Bae,Lee Ho-Seung,Lee Sin-Ro 대한관절경학회 2001 대한관절경학회지 Vol.5 No.1

목적 : 관절경 검사에서 전방 십자 인대의 만성 파열에서 파열된 전방 십자 인대가 슬관절 내에서 반흔을 형성하고 있는 경우 전방 전위 감소 여부, 자기 공명 영상 및 동반손상을 분석하고자 한다. 대상 및 방법 : 1996년 12월부터 2000년 5월까지 전방 십자 인대의 만성 파열이 있었던 19예를 대상으로, 관절 계측기의 환측과 건측의 도수 전방 최대 전위차, 자기 공명 영상 및 동반손상을 분석하였다. 결과 : 만성 파열이 있었던 19예 중 7예$(37\%)$의 KT-2000관절계측기 검사 중 환측과 건측의 도수 최대 전방 전위차는 평균 $2.78{\pm}2.41mm$$(0\~6.5)$로, 반흔 형성이 없었던 12예의 평균 $5.75{\pm}2.52mm(3\~10)$와 비교하여 유의한 차이를 보였으며, 반월상 연골의 손상은 반흔을 형성하고 있던 7예 중 2예$(28\%)$, 반흔 형성이 없었던 12예 중 8예$(67\%)$에서 동반되었다. 자기 공명 영상 소견은 파열된 전방 십자 인대의 원위 조각이 비교적 직선주행으로 대퇴 기시부를 향하는 경우가5예, 연속성을 유지하며 국소적인 각형성이 있는 경우가 2예였다. 결론 : 전방 십자 인대 만성 손상의 관절계측기 검사에서 유의한 전방 전위가 없고, 자기 공명 영상에서 파열된 원위 조각이 비교적 직선 주행으로 대퇴 기시부를 향하거나 연속성을 유지하며 국소적인 각 형성을 이루는 소견들을 보이는 예에서는 파열된 전방 십자 인대의 반흔 형성을 고려해야될 것으로 사료되며, 반흔을 형성하고 있는 예에서 반월상 연골의 손상 빈도가 낮은 소견은 전방 십자 인대 완전 파열의 자연경과 연구에 도움이 되리라 생각한다. Purpose : To analyze changes of the anterior translation, MRI findings and associated injuries at scarring of the torn ACL in the chronic ACL rupture. Materials & Method : From Dec. 1996 to May 2000, 19 patients who were diagnosed as the chronic ACL rupture were studied. We analyzed KT-2000 side to side difference of maximal manual anterior displacement(MMAD), MRI findings and associated injuries. Results : There was statistically significant difference in the average MMAD between the 7 cases$(37\%)$ with scar formation$(2.78{\pm}2.41mm)$ and the 12 cases without scarring$(5.75{\pm}2.52mm)$. The chronic ACL rupture without scarring had more meniscal injuries$(67\%)$ than with scarring$(28\%)$. MRI showed that relatively straight bands toward expected insertion site with single large fragment(5 cases) and continuous band with focal angulation(2 cases). Conclusion : If relatively straight bands toward expected insertion site with single large fragment or continuous band with focal angulation on MR imaging is showed in the patient without significant anterior translation at arthrometer, the possibility of the scar formation of the torn ACL should be considered. We think that the chronic ACL rupture with scarring had less meniscal injuries than without scarring will give additional information on the natural history of ACL injuries.

YEAST BIOTECHNOLOGY

최의성 한국과학기술원 유전공학연구소 1995 생명공학동향 Vol.3 No.1

Bipolar radiofrequency system 사용 중 발생한 Tip의 분리 - 증례 보고 -

최의성,박경진,김용민,김동수,손현철,박지강,배승환,Choi, Eui-Sung,Park, Kyoung-Jin,Kim, Yong-Min,Kim, Dong-Soo,Shon, Hyun-Chul,Park, Ji-Kang,Bae, Seung-Whan 대한관절경학회 2008 대한관절경학회지 Vol.12 No.1

Recently, devices using radiofrequency energy have been developed for arthroscopic soft tissue ablation, cauterization and shrinkage. After ACL reconstruction operation, articular metallic foreign body was found in the post-operative radiographs. It was proven to be the tip of bipolar radiofrequency system after foreign body removal. After that we experienced 2 more cases during the acromioplasty procedure. We requires attention to prevent the separation of the tip from the body in the arthroscopic surgery using bipolar radiofrequency system. 최근 관절경 시술시 절제, 지혈, 수축(Shrinkage)을 효과적으로 수행할 수 있는 고주파 에너지를 이용한 bipolar radiofrequency system이 사용되고 있다. 저자들은 전방 십자 인대 재건술 후 방사선 사진상 관절 내 금속성 이물질을 발견, 이물질 제거술을 시행하여 bipolar radiofrequency system의 probe에서 분리된Tip을 제거하였다. 이후 견관절 견봉성형술 과정에서 Tip의 분리를 2예 추가적으로 경험하여 이를 보고하는 바이다.

자가 골연골 이식술(모자이크 성형술)로 치료한 고관절 탈구와 동반된 대퇴 골두 골절 - 증례 보고 -

최의성,손현철,정호승,양재영,홍석현,안병현 대한골절학회 2020 대한골절학회지 Vol.33 No.2

고관절의 탈구와 동반된 대퇴 골두 골절은 매우 드문 손상이다. 대부분의 경우 대퇴 골두 골절은 교통사고에 의한 고관절이나 하지의 고 에너지 손상으로 기인한다. 대퇴 골두 골절의 치료로 다양한 방법이 있다. 특히, 젊고 활동적인 환자에서 발생한 대퇴 골두의 외상성 골연골 손상의 치료로 다양한관절 보존 치료 방법이 제시되고 있다. 이번 연구에서 저자들은 고관절 탈구와 동반된 대퇴 골두의 외상성 골연골 손상을경험하고 연골 결손 부분에 대해 수술적 고관절 탈구 수술법으로 비체중부하 부위인 동측 대퇴 골두 하부의 자가 골연골을 이식하여 치료하였기에 보고하고자 한다. 수술 후 1년째통증 호소나 단순 방사선 촬영에서 외상 후 관절염 소견 없이만족스러운 결과를 보이고 있다. Femoral head fractures combined with hip dislocation are very rare injuries. In most cases, they result from high-energy trauma to the hip or lower extremity during traffic accidents. Various therapy options have been suggested to treat these injuries. Especially, different joint-preserving surgical options have been described for the treatment of traumatic osteochondral injury of the femoral head in young, active patients. In this report, we present a case that a traumatic osteochondral lesion to the femoral head after hip dislocation was treated with osteochondral autografts (OATS) from the non-weight-bearing area of the ipsilateral inferior femoral head through a surgical hip dislocation. After 1 year, the clinical and radiological outcome was satisfactory with no evidence of posttraumatic osteoarthritis and no pain of patients.

관절함몰형 종골 골절에 대한 다공성 하이드록시 아파타이트를 이용한 수술적 치료

최의성,김용민,김동수,손현철,박경진,조병기,박지강,유준일,Choi, Eui-Sung,Kim, Yong-Min,Kim, Dong-Soo,Shon, Hyun-Chul,Park, Kyoung-Jin,Cho, Byung-Ki,Park, Ji-Kang,Yoo, Jun-Il 대한족부족관절학회 2010 대한족부족관절학회지 Vol.14 No.1

Purpose: This study was performed to evaluate the clinical outcomes of operative treatment using porous hydroxyapatite for intraarticular calcaneal fracture of joint depression type. Materials and Methods: Twenty patients with intraarticular calcaneal fracture were followed up for more than 1 year. The period to union was calculated to evaluate the osteoconductivity of porous hydroxyapatite used as bone graft substitute. The measurement of Bohler angle, Gissane angle and the degree of articular surface depression was performed through preoperative and postoperative radiographs. The clinical evaluation was performed according to hindfoot score of the American Orthopaedic Foot and Ankle Society (AOFAS) and scale of the Creighton-Nebraska health foundation (CNHF). Results: Bohler angle and Gissane angle had improved significantly from preoperative average $10.4^{\circ}$, $117.8^{\circ}$ to average $22.6^{\circ}$, $113.5^{\circ}$ immediate postoperatively, and had maintained to average $21.2^{\circ}$ and $114.4^{\circ}$ at the last follow-up. The degree of articular surface depression had improved significantly from preoperative average 4.8 mm to 1.5 mm at the last follow-up. All cases achieved bone union, and the interval to union was average 12.8 weeks. AOFAS score was average 85.2 points at last follow-up. There were 7 excellent, 10 good, and 3 fair results according to the CNHF scale. Therefore, 17 cases (85%) achieved satisfactory results. Conclusion: Plate fixation using porous hydroxyapatite seems to be one of effective treatment methods for intraarticular calcaneal fracture of joint depression type, because of supporting the reduction of subtalar articulation by augmenting bony defect and facilitating bone formation. Further evaluation about long-term radiological changes and histological analysis on hydroxyapatite implantation site should be required.

Clinical Evaluation of the Root Tear of the Posterior Horn of the Medial Meniscus in Total Knee Arthroplasty for Osteoarthritis

최의성,박상준 대한슬관절학회 2015 대한슬관절학회지 Vol.27 No.2

Purpose: To investigate the incidence of root tears of the posterior horn of the medial meniscus in total knee replacement arthroplasty for knee osteoarthritis and retrospectively analyze clinical results and factors associated with root tears.Materials and Methods: There were 197 knees of 140 enrolled patients who had undergone total knee replacement arthroplasty between September 2010 and May 2014. The presence of a root tear of the posterior horn of the medial meniscus was confirmed in all patients. Statistical analysis was performed to investigate the correlation between root tears and the possible factors of meniscal tears including gender, age, severity of symptoms (visual analogue scale [VAS] score and medial joint line tenderness), grade of osteoarthritis (Kellgren-Lawrence grading scale), body mass index (BMI), varus deformity, and mechanical axis deviation.Results: Meniscal tears were observed in 154 knees (78.17%). The root tear had correlation with the severity of osteoarthritis (p<0.05), varus deformity (p<0.05), mechanical axis deviation (p<0.05), and BMI (p<0.05).Conclusions: Factors considered to represent the severity of osteoarthritis were found to be associated with root tears of the medial meniscus posterior horn. Increased BMI seemed to be associated with the increased incidence of root tears of the medial meniscus posterior horn.

Ti₂AlN과 Ti₂AlC 소결체의 마이크로 방전가공에서 재료물성에 따른 가공표면 특성

최의성,이창훈,백경래,김광호,강명창,Choi, Eui-Song,Lee, Chang-Hoon,Baek, Gyung-Rae,Kim, KwangHo,Kang, Myung Chang 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3

Ti alloys are extensively used in high-technology application because of their strength, oxidation resistance at high temperature. However, Ti alloys tend to be classified very difficult to cut material. In this paper, The powder synthesis, spark plasma sintering (SPS), bulk material properties such as electrical conductivity and thermal conductivity are systematically examined on $Ti_2AlN$ and $Ti_2AlC$ materials having most light-weight and oxidation resistance among the MAX phases. The bulk samples mainly consisted of $Ti_2AlN$ and $Ti_2AlC$ materials with density close to theoretical value were synthesized by a SPS method. Machining characteristics such as machining time, surface quality are analyzed with measurement of voltage and current waveform according to machining condition of micro-electrical discharge machining with micro-channel shape.

슬관절에 히야루론산 주입후 발생한 활막성 연골종증 : 증례 보고

최의성,김용민,김동수,손현철,박경진,조병기,배승환 충북대학교 의과대학 충북대학교 의학연구소 2009 忠北醫大學術誌 Vol.18 No.2

활막성 연골종증은 비교적 드문 양성 종양으로 관절내 활액막 결체조직의 양성 반응성 이형성에 의해 여러 개의 연골성 결절을 형성하고 이것이 관절내로 유리되어 유리체를 형성하는 질환으로 주로 슬관절에 발생한다. 활막성 연골종증의 정확한 발생 기전은 아직 밝혀지지 않았으나 외상, 감염 등이 원인으로 제시되고 있다. 저자들은 슬관절 내 히야루론산 주입후 발생한 슬관절내 활막성 연골종증을 1 례 경험하였으며, 관절경적 제거술을 통해 만족스런 결과를 얻었다. As a relatively rare benign tumor, synovial chondromatosis forms several cartilaginous nodules by the benign reactive metaplasia of synovial connective tissues within joints, which are loosed into the joints and cause a disease forming loose body mainly in knee joint. Accurate mechanism of synovial chondromatosis has not been clarified yet; however, trauma, infections and others have been suggested as its possible causes. The authors of this study experienced an example of a patient with synovial chondromatosis in knee joint occurred after the injection of hyaluronic acid in the joints and had a satisfactory outcome through the arthroscopic resection.

유전체 공진기 대역통과 필터의 기술 개요

최의성,홍경희 대한금속재료학회 ( 구 대한금속학회 ) 2002 재료마당 Vol.15 No.1