전방 십자 인대 손상군과 정상군에서 슬개골 저위증의 비교

이우석,김성훈,조성진,임지혁,정환용,황철목,Lee, Woo-Suk,Kim, Sung-Hun,Cho, Sung-Jin,Lim, Ji-Hyuk,Chung, Whan-Young,Hwang, Cheol-Mog 대한관절경학회 2006 대한관절경학회지 Vol.10 No.1

목적: 전방 십자 인대 손상군과 슬관절의 손상 경력이 없는 정상군에서 슬개골 저위증의 빈도와 그 정도를 비교하고자 한다. 대상 및 방법: 스포츠 손상 후 발생한 전방 십자 인대 파열로 전방 십자 인대 재건술을 시행한 114예를 대상으로 하였다. 제 I 군은 수상 후 3주 이내에 자기공명영상을 시행한 급성 전방 십자 인대 파열군으로, 제 II 군은 3주 이후에 자기공명영상을 시행한 만성 전방 십자 인대 파열군으로, 제 III 군은 정상 대조군으로 하였다. T1 강조 자기 공명영상 정중 시상면에서 Insall-Salvati ratio, Carton index를 측정하여 비교 분석하였다. 결과: 정상군에서 Insall-Salvati ratio는 $1.02{\pm}0.12$, Carton index는 $1.14{\pm}0.16$, 전방 십자 인대 파열군에서는 각각 $0.91{\pm}0.12,\;0.89{\pm}0.20$으로 전방 십자 인대 파열군에서 모두 통계학적으로 유의하게 적었다. 급성 전방 십자 인대 파열군과 만성 전방 십자 인대 파열군에서의 비교는 통계학적 유의성은 없었다. 결론: 전방 십자 인대 파열군에서 정상 대조군과 비교시 슬개골 저위증의 경향을 보였으며, 따라서 전방 십자 인대 재건술시 슬개골 저위증의 경우, 이식건의 선택에 있어 세심한 고려가 필요할 것으로 사료된다. Purpose: The object of this study is to compare the Insall-Salvati ratio and Carton index between the patients who have an anterior cruciate ligament (ACL) tear and the patients who have no ACL tear. Materials and Methods: The study group included 114 patients who had an ACL tear and received arthroscopic reconstruction. The group I was acute ACL tear group, within 3 weeks after injury. The group II was chronic ACL tear group who had MRI was done after 3 weeks from injury. The group III was normal control group. We measured the Insall-Salvati ratio and Carton index on Magnetic Resonance Images (MRI) for all patients. Results: The Insall-Salvati ratio of control group was $1.02{\pm}0.12$ and Carton index of control group was $1.14{\pm}0.16$. The ACL-tear study group was $0.91{\pm}0.12\;and\;0.89{\pm}0.20$ respectively. The Insall-Salvati ratio and Caton index in ACL tear group was significantly less than those of control group. There were no significant differences in comparing with acute and chronic ACL tear group. Conclusion: Our study show that patella baja has an association with ACL tears, therefore in patients with an ACL tear who had patella baja, ideal graft for reconstruction was seriously considered.

슬관절 관절경 수술시 세척액 - 생리 식염수와 Lactated Ringer 용액의 비교

이우석,배인탁,허윤무,박원기,오병학,정환용,Lee, Woo-Suk,Bae, In-Tak,Hur, Yun-Moo,Park, Won-Ki,Oh, Byung-Hak,Chung, Whan-Yong 대한관절경학회 2008 대한관절경학회지 Vol.12 No.2

목적: 슬관절 관절경하 반월상 연골 수술 시 생리 식염수와 Lactated Ringer 용액을 세척액으로 사용하여 임상적인 결과를 분석하고자 하였다. 대상 및 방법: 내측 반월상 연골 파열로 관절경하 내측 반월상 연골 부분 절제술을 시행한 64예를 대상으로 하였다. 제 I 군은 세척액으로 생리 식염수를 사용한 군으로, 제 II 군은 세척액으로 Lactated Ringer 용액을 사용한 군으로 분류 하였다. 수술 후 1일째의 visual analogue scale, 능동적 슬관절 굴곡 각도 및 슬관절 둘레의 증가율를 측정하여 비교 분석하였다. 결과: 수술 후 1일째의 visual analogue scale 및 능동적 슬관절 굴곡 각도의 비교는 통계학적으로는 두군 간에 유의성은 없었다. 그러나 수술 후 슬관절 둘레의 증가는 Lactated Ringer 용액을 사용한 군에서 생리 식염수를 사용한 군에 비해 통계학적으로 유의하게 적었다. 결론: 슬관절 반월상 연골 수술 시 Lactated Ringer 용액이 수술 후 부종의 감소에 생리 식염수보다 좋을 것으로 사료된다. Purpose: The object of this study is to compare the clinical results of noraml saline and Lactated Ringer's solution in the arthroscopic meniscus surgery on the knee. Materials and Methods: The study group included 64 patients who had an medial meniscus tear and received arthroscopic partial medial meniscectomy. The group I was normal saline group, which was used as an irrigation solution during operation. The group II was Lactated Ringer's solution group. We measured the visual analogue scale, painless active knee flexion angle, and the ratio of the knee swelling at postoperative one day for all patients. Results: The visual analogue scale and the painless active knee flexion angle were no significant differences in comparing with normal saline and Lactated Ringer's solution group. The ratio of the knee swelling in Lactated Ringer's solution group was significantly less than those of noraml saline group. Conclusion: Lactated Ringer's solution has an advantage of decreasing the knee swelling in the arthroscopic meniscus surgery on the knee.

저온소성 마이크로파 유전체 세라믹스 복합체의 Tape Casting특성

이우석,김창환,하문수,정순종,송재성,류봉기,Lee, Woo-Suk,Kim, Chang-Hwan,Ha, Mun-Su,Jeong, Soon-Jong,Song, Jae-Sung,Ryu, Bong-Ki 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.2

마이크로파 유전체 세라믹스 $BaO-Nd_{2}O_3-TiO_{2}(BNT)$계 상용분말과 PbO-base의 결정화 유리프릿 복합체를 출발원료로 하여 테입 케스팅법으로 그린시트를 제초하기 위해 첨가유기물의 조성 변화에 따른 슬러리의 분산특성 및 유동특성 그리고 최종그린시트의 그린/소결밀도 변화를 연구하였다. 분산제량의 증가는 분산에 유효하였으나, 일정량 이상이 첨가되면 분산을 저해하는 요인으로 작용하였으며 복합체 분말에 1.75 wt$\%$의 fish oil을 첨가하였을 때 분산특성이 가장 우수하였다 준비된 모든 조성의 슬러리에서 의가소성거동(shear thinning)이 나타났고 파우더, 바인더 그리고 유기물의 전체 함량이 증가할수록 상대점도는 증가하는 경향을 나타내었다. 복합체 분말과 용매의 비율 65 : 35, 결합제는 6 wt$\%$, 가소제는 3 wt$\%$에서 테이프의 특성이 가장 우수하였다. 이때 슬러리의 점도는 677cps, 그린/소결밀도는 $3.3g/cm^3,\;5.56g/cm^3$로 각각 나타났다. Sintering behavior of $BaO-Nd_{2}O_3-TiO_2$ with a Pb-based glassceramics frit were investigated in order to understand an effect of glassceramics as a low temperature sintering agent on dielectric ceramics. A green sheet form was fabricated through tape casting method with the glassceramic fut added $BaO-Nd_{2}O_3-TiO_2$. The dispersion properties, rheological properties and final density of dielectric composit slurry as a function of amount and composition of organic additives was examined. The dispersants' addition was effective in controlling dispersion of the ceramics in solution. The addition of excessive dispersant showed adverse effect on dispersion. The prepared slurries, containing ceramic : powders, glass-ceramics and various kinds of organic viechles, exhibited typical shear thinning behavior. The best properties of tape casting appeared powder to solvent ratio 65 : 35 and amount of the binder 6 wt$\%$ and plasticizer 3 wt$\%$. The viscosity of the slurry was 677 cps and green/sintered density in the tape was $3.3 g/cm^3,\;5.56 g/cm^3$ respectively.

전산화 단층 모의치료기(Computed Tomography Simulator)의 영상을 이용한 TBI(Total Body Irradiation) 자세 잡이 및 보상체 제작의 유용성에 관한 고찰

이우석,박성호,윤인하,백금문,김정만,김대섭,Lee Woo-Suk,Park Seong-Ho,Yun In-Ha,Back Geum-Mun,Kim Jeong-Man,Kim Dae-Sup 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.2

Purpose : We should use a computed tomography-simulator for the body measure and compensator manufacture process was practiced with TBI's positioning in process and to estimate the availability.,Materials and Methods : Patient took position that lied down. and got picture through computed tomography-simulator. This picture transmitted to Somavision and measured about body measure point on the picture. Measurement was done with skin, and used the image to use measure the image about lungs. We decided thickness of compensator through value that was measured by the image. Also, We decided and confirmed position of compensator through image. Finally, We measured dosage with TLD in the treatment department.,Results : About thickness at body measure point. we could find difference of $1{\sim}2$ cm relationship general measure and image measure. General measure and image measure of body length was seen difference of $3{\sim}4$ cm. Also, we could paint first drawing of compensator through the image. The value of dose measurement used TLD on head, neck, axilla, chest(lungs inclusion), knee region were measured by $92{\sim}98%$ and abdomen, pelvis, inquinal region, feet region were measured by $102{\sim}109%$.,Conclusion : It was useful for TBI's positioning to use an image of computed tomography-simulator in the process. There was not that is difference of body thickness measure point, but measure about length was achieved definitely. Like this, manufacture of various compensator that consider body density if use image is available. Positioning of compensator could be done exactly. and produce easily without shape of compensator is courted Positioning in the treatment department could shortened overall $15\{sim}20$ minute time. and reduce compensator manufacture time about 15 minutes.

NC선반 2축 제어기의 개발 및 실증실험

이우석(Woo-Suk Lee),오철수(Chul-Soo Oh) 대한전기학회 1995 대한전기학회 학술대회 논문집 Vol.1995 No.7

정형외과 영역에서 로봇수술

이우석(Woo-Suk Lee),정우석(Woo-Suk Jung) 대한정형외과학회 2018 대한정형외과학회지 Vol.53 No.6

정형외과 수술의 임상적 결과에 영향을 미치는 요소는 여러 가지가 있지만 수술적 수기가 가장 중요한 요인이며 로봇공학은 술기를 보다 정확하고 일관되게 수행하기 위해 도입되었다. 정형외과 영역에서는 20년 전부터 로봇수술을 사용하였으나 실용성 문제와 합병증의 발생으로 일부 로봇은 도태되었으며 단점을 개선한 로봇이 소개되고 있다. 대부분의 로봇수술은 인공관절수술 분야에서 시행되었고 치환물의 정렬과 위치 선정에서 우수한 것으로 보고되고 있다. 그러나 임상적 결과의 우수성, 실용성, 가성비 등의 측면에서 제한점이 있고 일부 로봇수술에서는 합병증 발생 빈도가 높다는 보고가 있었다. 초기 로봇수술은 수술자의 개입 없이 계획된 수술이 진행되는 능동형 로봇수술이 주를 이루었으나 최근에는 수술과정에서 실시간 피드백을 통해 술자가 술 전 계획을 변경할 수 있고, 햅틱경계 내에서 제한된 골절제를 함으로써 주요 혈관, 신경, 인대 등의 손상을 최소화할 수 있는 반능동형 로봇수술이 소개되고 있다. Of the many factors that affect the clinical outcomes of orthopedic surgery, the surgical procedure is the most important. Robotics have been developed to perform the surgical procedures more accurately and consistently. Robotic surgical procedures in the orthopedic field were developed 20 years ago. Some designs of surgical robots have disappeared due to practical problems and complications, and an another design of surgical robots is emerging. To date, the use of robot surgery in arthroplasty is still controversial in terms of the clinical outcomes, practicality, and cost-effectiveness, even though it has been reported to be effective in the alignment and positioning of components in the field of artificial joints. Early robotic surgery was based mainly on active robot surgery according to the scheduled operation without the intervention of the operator. Recently the semi-active system of robotic surgery has been introduced. In a semi-active system, the robot constrains the surgeon to a haptic boundary defined by the computer based on the 3-dimensional imaging preoperative plan, and the operator can change the preoperative plan through real-time feedback during operation.

KNX-ZigBee 게이트웨이의 설계 및 구현

이우석(Woo Suk Lee),홍승호(Seung Ho Hong) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.7

The demand for wireless technology in home automation systems has recently been increasing due to several advantages such as installation cost reduction, easy placement, easy extension, aesthetic benefits, and mobile device connectivity. Among the many wireless technologies, ZigBee is one of the most useful for home automation; a wireless home networking system can be configured using ZigBee alone. Compatibility with conventional home networking systems that are based on wired media, however, is not supported. KNX is a mature protocol for wired media that is recognized as an international standard. This paper proposes a KNX?ZigBee gateway to interface between KNX and ZigBee systems and thereby enable integration of wired and wireless home automation systems.

60세 이상의 환자에서 세라믹-세라믹 관절면 무시멘트형 인공 고관절 전치환술

이우석 ( Woo Suk Lee ),조성진 ( Sung Jin Cho ),전택수 ( Taek Soo Jeon ),김상범 ( Sang Bum Kim ),허윤무 ( Youn Moo Heo ),이진웅 ( Jin Woong Yi ),박원기 ( Won Ki Park ) 대한고관절학회 2010 Hip and Pelvis Vol.22 No.2

Purpose: To investigate clinical and radiographic results for cementless total hip arthroplasty (THA) using ceramicon- ceramic articulation in patients over 60 years old. Materials and Methods: Between May 2000 and February 2007, we analyzed 44 THAs that used ceramic-onceramic articulation in 34 patients aged 60 or older. The mean follow-up duration was 3.2 years; the mean age was 66.8 years. Clinical and radiographic evaluations were carried out. Risk factors for dislocation were evaluated. Results: Final Harris hip scores increased to an average of 90 points from an average of 51 points preoperatively. Radiographic findings demonstrated that fixations around the stems and the acetabular cups were stable. There was no aseptic loosening and osteolysis around the implants. There were 10 cases of posterior dislocation within 3 months postoperatively. Two revisions were done, one due to a recurrent dislocation and one to a ceramic head fracture. Risk factors for dislocation were ASA score, cup anteversion angle and total anteversion angle. Conclusion: Cementless THAs using ceramic-on-ceramic articulation for patients aged sixty or more elicits good clinical and radiographic results. Because of the high rate of early dislocation and damage to the ceramic, we call attention to the position of the implants and postoperative management in elderly, debilitated patients.

골용해의 발생기전에서 폴리에틸렌 마모편이 골아세포에 미치는 영향

이우석(Woo-Suk Lee),한창동(Chang-Dong Han),김성재(Sung-Jae Kim),강응식(Eung-Shick Kang),박종철(Jong-Chul Park) 대한정형외과학회 2003 대한정형외과학회지 Vol.38 No.6

안정성 대퇴골 전자간 골절의 내고정 후 활강

이우석 ( Woo Suk Lee ),정환용 ( Whan Young Chung ),김우식 ( Woo Sik Kim ),김용찬 ( Yong Chan Kim ),전택수 ( Taek Soo Jeon ),조성권 ( Sung Kwun Jo ),배인탁 ( In Tak Bae ),임영수 ( Young Su Lim ) 대한골절학회 2005 대한골절학회지 Vol.18 No.2