전방 불안정성과 동반된 슬관절 내측 구획 진행성 관절염환자에서 전방십자인대 재건술 및 인공 관절 부분 치환술의 결과 - 3예 보고 -

이철형,송인수,지종훈,김태인,Lee, Chul Hyung,Song, In Soo,Ji, Jong Hun,Kim, Tae In 대한관절경학회 2013 대한관절경학회지 Vol.17 No.1

비교적 젊은 연령의 환자에서 슬관절 내측 구획의 퇴행성 관절염(Kellegrene-Laurence 제 3단계 및 Outerbridge 제 4단계)과 전방십자인대의 파열이 동반되어 전방 불안정성이 있는 3예에서 2예는 전방십자인대 재건술의 6개월 이후 단계적으로 인공 관절 부분 치환술을 시행하고 나머지 1예는 동시에 전방십자인대 재건술 및 부분 치환술을 시행하였으며 수술 전, 후의 International Knee Documentation Committee (IKDC), Lysholm 점수와 최종 추시 상 Hospital for special surgery (HSS)와 knee society score (KSS) 점수를 측정하였다. 저자들의 슬관절의 전방 불안정성과 동반된 내측 구획의 진행성 관절염에서 전방십자인대 재건술과 함께 동시에 또는 단계적으로 시행한 내측 구획 인공 관절 부분 치환술은 슬관절 불안정성과 진행성 관절염에 의한 통증을 동시에 또한 만족스럽게 해결할 수 있는 좋은 선택이라고 사료된다. Three cases who had medial compartment osteoarthritis of the knee (Kellgrene-Laurence grade 3 and Outerbridge grade 4) and anterior instability of the knee due to rupture of the anterior cruciate ligament in relative young ages underwent staged anterior cruciate ligament reconstruction followed by medial unicondylar arthroplasty in 2 cases and simultaneous anterior cruciate ligament reconstruction and unicondylar arthroplasty. We evaluated clinical results some kinds of preoperative and postoperative International Knee Documentation Committee (IKDC), Lysholm score and last follow-up hospital for special surgery (HSS), knee society score (KSS). We consider that medial unicondylar arthroplasty with staged or simultaneous anterior cruciate ligament reconstruction is very good option of the treatment for the anterior instability and pain from advanced arthritis.

불안정성 원위 요골 골절의 치료에 있어 한국형 이중 연골하 지지고정 전방 금속판의 임상적 및 방사선학적 결과

이철형(Chul-Hyung Lee),정덕희(Deukhee Jung),안충한(Chung-Han An),정의탁(Uitak Jeong) 대한정형외과학회 2020 대한정형외과학회지 Vol.55 No.6

목적: 본 연구는 요골 원위부 골절에 대해 국내에서 이중 연골하 지지고정 개념으로 개발된 전방 잠김 금속판의 수술 후 정복 유지효과 및 이에 영향을 줄 수 있는 요인들에 대해 평가해 보고자 하였다. 대상 및 방법: 2017년 7월부터 2018년 12월까지 요골 원위부 골절 환자 중 관혈적 정복 및 금속판 고정술을 시행한 54예를 대상으로 하였다. 수술 직후와 최종 추시 시 촬영한 단순방사선 사진을 이용해 요골 길이, 요골경사, 수장측 경사, 척골 변위, 원위 배측 피질 거리(distal dorsal cortical distance)를 측정하여 골절 정복 유지 효과에 대해 평가하였다. 환자 나이, 골절 분류, 금속판 위치를 기준으로 전체 환자군을 세부 그룹으로 나누어 비교함으로써 각 요인이 골절 정복 유지에 미치는 영향을 분석하였다. 결과: 수술 직후 원위 배측 피질 거리는 평균 5.91 mm (표준 편차, ±1.95 mm)로 측정되었으며 요골 길이(p=0.038), 척골 변위(p=0.001)는 수술 직후와 최종 추시 시 촬영한 단순 방사선 사진에서 유의한 차이가 확인되었다. 전체 환자군을 각 요인에 따라 세부 그룹으로 나누어 평가했을 시 척골 변위는 나이가 65세 이상이거나 AO/OTA 분류 C3형에 해당하는 경우 혹은 금속판 위치가 Soong classification grade 0에 해당하는 경우 수술 직후에 비해 최종 추시 시 유의하게 증가하였다(p=0.007, p=0.012, =p0.046). 결론: 국내에서 이중 연골하 지지고정 개념으로 생산된 전방 잠김 금속판을 이용하여 요골 원위부 골절 정복술을 시행하는 경우 충분한 정복을 확보할 수 있으며 골절 정복 유지에 대해 전반적으로 긍정적인 결과를 보이나, 환자가 고령인 경우, 관절 내 골절의 분쇄 정도가 심한 경우, 금속판이 분수령선의 근위부에 위치한 경우에 척골 변위의 증가를 보여 요골 월상골와의 정복 유지를 위한 고려가 필요하다. Purpose: The aim of this study was to assess the effectiveness of domestically developed volar locking plate which has the concept of double-tiered subchondral support (DSS) in maintaining the reduction after distal radial fracture surgery. Materials and Methods: From July 2017 to December 2018, 54 patients were assessed. Plain radiographs were obtained immediately after surgery and at the last follow-up, and the radiographic parameters were measured in those images: radial length, radial inclination, volar tilt, ulnar variance, and distal dorsal cortical distance. The patients were subdivided into their age, type of fracture, and the position of the plate to evaluate the influence of each factors on the reduction maintenance. Results: Distal dorsal cortical distance in radiographs after the surgery was 5.91 mm (standard deviation, ±1.95 mm) on average. Significant differences in the radial length (p=0.038) and ulnar variance (p=0.001) were observed between immediately after surgery and at the last follow-up. When the parameters were evaluated by dividing the patients into subgroups according to the three specific factors, the ulnar variance showed a significant increase at the last follow-up when the patients were included 65-years-old or older. AO/OTA type C3 fracture, and Soong classification grade 0 plate position (p=0.007, p=0.012, p=0.046, respectively). Conclusion: Using the domestically developed DSS-type volar locking plate, significant reduction after distal radial fracture surgery could be maintained successfully. On the other hand, further study will be needed to determine about the reduction loss of the lunate facet identified in special cases that deal with fractures in elderly patients, unstable AO/OTA type C3 distal radial fractures, and Soong classification grade 0 plate position.

저낙차 수자원 활용을 위한 카프란수차 연구

이철형(Lee Chul Hyung),박완순(Park Wan Soon) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

타이어 공명음을 줄이기 위한 휠 공명기 개발

이철형(Chul-Hyung Lee),한명재(Myeong-Jae Han),박태원(Tae-Won Park) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11

카프란수차모헝의 수력학적 성능특성 분석

이철형(Lee, Chul-Hyung),박완순(Park, Wan-Soon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06

The Kaplan turbine model has been tested and analyzed. The blade angle and the guide vane opening of the turbine model were designed to be varied according to the best combination of guide vane and runner blade opening. When the changes in head and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed model in this study will be suitable for small hydropower stations with large changes In head and load such as agricultural reservoir.

하수처리장 방류수를 이용한 소수력발전 성능분석

이철형(Lee Chul-Hyung),박완순(Park Wan-Soon) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3

A methodology to predict the output performance of small hydro power using treated effluent in wastewater treatment plant has been studied. Existing plant located Kyunggi-Do were selected and the output performance characteristics for these plants were analyzed. As a result, it was found that the developed mode? in this study can be used to analyze the output characteristics for small hydro power in wastewater treatment plant. Additionally, primary design specifications such as design flowrate, capacity, operational rate and annual electricity production were estimated and discussed.

농업용 보를 이용한 소수력발전소의 타당성 분석

이철형(Lee Chul-Hyung),박완순(Park Wan-Soon) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4

Feasibility assessment for small hydropower plants using diversion weirs located in stream for agricultural purpose has been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the inflow caused from rainfall. And another model to predict hydrologic performance for small hydropower plants is established. Preliminary survey was performed identifying several candidate sites, and two sites were selected finally for actual site reconnaissance. During the course of site survey, generating capacity, construction and equipment cost, and payback through life time of each sites were calculated for economical feasibility analysis. The results of this study have estimated that the small hydropower plants using diversion weirs for agricultural purpose may offer better opportunities in future with increasing fuel cost and nation's energy policy.

프란시스수차의 수력학적 성능특성 분석

이철형(Lee, Chul-Hyung),박완순(Park, Wan-Soon) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06

The Francis type hydro turbine with vertical axis has been designed and analized for hydraulic performance verification. The guide vane angle of turbine casing were designed to be varied according to the condition of head and flowrate. When the changes in flowrate and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed hydro turbine in this study will be suitable for small hydro power stations with medium and high head such as agricultural reservoirs and large dam.

송풍기의 고효율에너지기자재 인증 방안

이철형(Chul-Hyung Lee) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-

FSI 기법을 이용한 Self-Inflating Tire의 펌핑 튜브 형상 최적화

이철형(Chul-Hyung Lee),한명재(Myung-Jae Han),박태원(Tae-Won Park),김명준 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

In this work, it studied the Self-Inflating Tire to prevent shortage/excessive tire pressure. Self-Inflating Tire is a technology that keeps the air pressure of the tire constant, which prevents accident risk and tire life reduction due to shortage/excessive air pressure. The shape optimization of the inner pumping tube of the tire was performed using ANSYS FSI(Fluid-Structure Interaction) technique. The tube optimization parameters were the outer diameter and thickness of the tube. The objective function was the inlet and outlet air pressure difference and outer diameter of the pumping tube. The optimization was performed using the central composite programming method, and a ANOVA table is used to verity the reliability of the regression model function estimated from the central composite table results. The shape optimization of the pumping tube was implemented from the verified ANOVA table.