횡족근 관절의 단일 및 이중 유합술의 비교

윤현국,이종석,이진우,Youn, Hyun-Kook,Lee, Jong-Seok,Lee, Jin-Woo 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.1

Purpose: The purpose of this study was to compare the clinical and radiological results of single and double fusions in the transverse tarsal joint. Materials and Methods: Between December 2000 and April 2009, 16 patients (16 feet) who had been treated by fusion of transverse tarsal joint were included in this study. In 8 patients, only talonavicular joint was fused and in the other 8 patients, both talonavicular and calcaneocuboid joints were fused simultaneously. We have measured talo-first metatarsal angle, calcaneal pitch angle, talonavicular coverage angle and presence of adjacent joint arthritis for radiological assessment at both preoperative and last visit. Furthermore, we have evaluated Visual Analogue Scale (VAS), American Orthopaedic Foot and Ankle Society (AOFAS) score and patient's satisfaction. Results: In a single fusion group, VAS was improved from $6.4{\pm}1.4$ to $0.8{\pm}1.0$ (p=0.0011) and AOFAS score was improved from $63.8{\pm}6.2$ to $89.4{\pm}9.8$ (p=0.0012). In a double fusion group, VAS was improved from $8.0{\pm}0.75$ to $2.0{\pm}1.8$ (p=0.0011) and AOFAS score was improved from $60.5{\pm}11.2$ to $89.5{\pm}6.0$ (p=0.0012). In the difference of talo-first metatarsal angle between two groups, a single fused group was more improved than a double fused group (p=0.04). Conclusion: Both single and double fusions are useful and attractive treatment for the transverse tarsal joint arthritis. Furthermore, a single fusion has advantages of less invasiveness and preserving some degree of hindfoot motion and could be an effective alternative to a double fusion if patient meets appropriate criteria through careful preoperative evaluation.

Polyetherimide 접착제의 표면 처리에 따른 MCM-D 계면 접착력 및 고온고습 신뢰성 변화에 관한 연구

윤현국,고형수,백경욱,Yoon, Hyun-Gook,Ko, Hyoung-Soo,Paik, Kyung-Wook 한국재료학회 1999 한국재료학회지 Vol.9 No.12

Polyetherimide와 실리콘 사이의 RIE 처리 및 알루미늄 킬레이트 계열의 adhesion promoter 처리에 따른 접착력과 고온고습환경에서의 신뢰성 변화를 연구하였다. 실험 방법으로는 180$^{\circ}$ 필 테스트 및 <85$^{\circ}C$ 85%> 테스트, SEM, AFM, 증류수 접촉각 실험이 수행되었다. $^O_2$ RIE 실험 결과 초기 접착력은 RIE 처리시간에 따라 약간의 변화를 가져왔으나 고온고습 환경에서의 저항성은 급격히 떨어지는 것이 관찰되었고 이것은 표면 거칠기의 영향이 아닌 표면의 친수성 정도에 따른 것으로 나타났다. Al-chelate adhesion promoter의 경우 초기 접착력에는 변화가 없으나 고온 고습환경에서의 저항성이 크게 증가하였는데 이것은 표면이 소수성으로 변한 데 따른 것으로 나타났다. The adhesion strength and high temperature/high humidity reliability of polyetherimide (PEI) adhesive on silicon wafer after being treated by each reactive ion etching (RIE) Aluminum (Al)-chelate adhesion promoter were investigated. 180$^{\circ}$ peel test and <85$^{\circ}C$ 85%> humidity test were performed for the initial adhesion strength and high temperature/high humidity reliability, respectively. For investigating surface effect scanning electron microscope (SEM), atomic force microscope (AFM), deionized (DI)-water contact angle studies were carried out. To investigate RIE effect, PEI was treated with $^O_2$ RIE, and then laminated. The initial peel strength increased slightly from 1.6 kg/cm for the first 2 minutes, and then decreased. High temp/high humid resistance decreased rapidly by RIE etching. RIE treatment on PEI affected on both of roughness and hydrophilicity increase. Aluminum-chelate adhesion promoter was coated by spinning on silicon wafer. The initial peel strength showed no effect of adhesion promoter treatment, but high temp/high humidity resistance increased remarkably. Al-chelate adhesion promoter did not affect the roughness but increased hydrophilicity.

한국인의 사망 장소와 관련된 요인

윤현국,윤영호,오상우,고희정,허봉렬 대한가정의학회 2001 Korean Journal of Family Medicine Vol.22 No.7

백의불안척도의 개발

윤현국,정승호,최은영,김성원,허봉렬,노태헌 대한가정의학회 1996 Korean Journal of Family Medicine Vol.17 No.1

대퇴 간부 골절의 골수강내 금속정 삽입 치료 -이상와 및 전자 삽입점에 따른 비교-

윤현국 ( Hyun Kook Youn ),손욱진 ( Oog Jin Shon ),한동성 ( Dong Sung Han ) 대한골절학회 2008 대한골절학회지 Vol.21 No.3

목적: 대퇴 간부 골절의 골수정 치료 시 삽입점의 차이에 따른 치료 결과를 비교하고자 하였다. 대상 및 방법: 2004년 2월에서 2007년 2월 사이에 37명 중 전자군 17명, 이상와군 20명을 대상으로 양 군의 임상적 및 방사선학적 결과를 조사하였다. 결과: 양 군에서 기능점수, 운동범위, 유합기간은 유사하였으며 정렬은 양 군이 유사하였으나 근위부 1/3에서 이상와군에서 더 다양한 정렬을 보였다. 절개 크기는 이상와군 8.7 ㎝, 전자군 5.8 ㎝였고 (p<0.05), 체중에 따른 절개 크기도 통계학적으로 유의한 차이가 있었다. 수술 시간은 정상 체중군에서는 차이가 없었으나 과체중군에서 이상와군 125분, 전자군 90분으로 통계학적으로 유의한 차이가 있었다 (p<0.05). 출혈량은 이상와군 313 ㏄, 전자군 268 ㏄로 유사하였고 과제중군에서 전자군이 더 적었다 (p<0.05). 이상와군에서 근위부 골절에 5.7˚ 내반 각형성 1예, 양 군 모두에서 불유합이 각각 2예 관찰되었다. 결론: 전자부 삽입군이 이상와군과 유사하게 만족할 만한 골유합과 낮은 합병률을 보였으며 특히 전자부 삽입 골수정은 근위부 대퇴간 부골절 및 과제중 환자에 있어서 우선적인 대안이 될 수 있을 것이다. Purpose: To compare the results of IM nailing of femur shaft fractures using trochanteric and piriformis fossa entry portal. Materials and Methods: 37 patients were treated with IM nail using Trochanteric (Trochanter group: TG, n=17) and piriformis fossa entry portal (piriformis group: PG, n=20) and were followed from February 2004 to 2007. The outcomes were assessed based on the clinical and radiographic findings. Results: The functional result, ROM and union time were similar in both groups. The alignment was similar in both groups but PG showed variable alignment in proximal 1/3. Incision was larger in PG (PG=8.7 ㎝, TG=5.8 ㎝, p<0.05) and there was a difference between overweight and normal weight group. Operative time was 95 minutes in PG, 87 minutes in TG (p>0.05), there was statistically significant difference in overweight groups (PG=125 minutes, TG=90 minutes, p<0.05). Blood loss was 313 cc in PG, 268 cc in TG and less in TG in overweight patients (p<0.05). There was 5.7˚ of varus angulation in PG, 2 nonunion cases in both groups. Conclusion: The femoral nail specially designed for trochanteric insertion resulted in high union rates, low complication rates similar to conventional nail and the trochanteric nail can be the alternative choice especially in proximal femur fracture and overweight patients.

백의불안 척도의 개발

노태헌,윤현국,정승호,최은영,김성원,허봉렬 大韓家庭醫學會 1996 Korean Journal of Family Medicine Vol.17 No.1

족부 제2형 부주상골에서 절제술과 골유합술 간의 임상적 결과 비교

이종석,윤현국,최우진,이진우,Lee, Jong-Seok,Youn, Hyun-Kook,Choi, Woo-Jin,Lee, Jin-Woo 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.2

Purpose: The purpose of this study is to compare the clinical outcome of excision versus osteosynthesis of type II accessory navicular performed by a single surgeon. Materials and Methods: Cases of 14 feet treated with excision and 13 feet by osteosynthesis for type II accessory navicular of 25 patients from 2002 to 2009 were included in this study. Radiological measurements and American Orthopaedic Foot and Ankle Society (AOFAS) midfoot scale was evaluated. Results: AOFAS midfoot scale of both excision and osteosynthesis groups at last follow-up showed improvement from pre-operation. However, there was no statistical difference in AOFAS midfoot scale and subjective satisfaction between the two groups at last follow-up. In detail of AOFAS midfoot scale, pain and footwear requirements showed statistically favorable results for the excision group, while activity limitation and support showed statistically favorable results for the osteosynthesis group. Subjective recovery time returning to daily activities and starting rehabilitation exercise were 14.6 weeks in the excision group and 13.7 weeks in the osteosynthesis group (p=0.025, Mann-Whitney). Suture anchor loosening was observed in one case in the excision group and non-union in two cases in the osteosynthesis group. Conclusion: Both excision and osteosynthesis are favorable surgical methods, but each method has advantages and possible complications such as suture anchor loosening or non-union. Surgeon's preference, patient's chief complaint, specific needs of patient after the operation and consideration of the size of accessory navicular can be a criteria to consider when selecting a surgical method.

흉요추부 골절에서 척추경 나사못 고정술 후 발생한 금속부전시 Magerl 및 McCormack 하중담당 분류의 예측력

안면환,박성혁,성민철,안종철,윤현국 대한척추외과학회 2008 대한척추외과학회지 Vol.15 No.4

Study Design: A retrograde study of metal failures at thoracolumbar spinal fractures fixed using pedicle screws. Objectives: The predictability and usefulness of the McCormack's classifications for metal failures was compared with Magerl’s classifications. Summary of Literature Review: The load sharing classification was introduced to predict metal failure after short-segmental pedicle screw fixation by McCormack. However, its reliability is uncertain. Materials and Methods: From July 2000 to July 2003, this study examined the plain radiographs and CT images of 31 out of 46 patients who underwent posterior stabilization using pedicle screws for thoracolumbar fractures and could be followed up at least 1 year. Fractures were classified utilizing Denis’s, Magerl’s, and McCormack’s systems. Results: As a result of analysis of relation between metal failure and classification system by Magerl or McCormack, there was no significant difference in its distribution. There was no correlation between the fixation range and metal failures in type C3 fractures, but there was a correlation between short fixation and metal failures in rotational burst fractures in short fixation. Conclusions: In order to prevent metal failures after fixing thoracolumbar spinal fractures by pedicle screws, the stability should be evaluated using Magerl’s classification and McCormack’s total score. In addition, in cases of type C3 fractures according to the Magerl’s classification, reconstructions should be carried out with a long segment fixation or anterior supporting bone grafts, particularly when McCormack’s total score is greater than 7.

서울 지역 개원의의 대체의학에 대한 인식 및 형태

유태우,오상우,윤영호,윤현국,김진하 대한가정의학회 1999 Korean Journal of Family Medicine Vol.20 No.1

Type Ⅳ 고세장비 수소저장용기의 Hoop 인장 시험에 관한 수치해석적 연구

박문식(MOONSIC PARK),이준숭(JUNSOONG LEE),윤원호(WONHO YOON),박균범(KYUNBUM PARK),윤현국(HYEONGUK YUN),주성욱(SUNGWOOK JOO) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.1

In this study, in order to propose a integrity evaluation for type Ⅳ high aspect ratio hydrogen storage vessel, a numerical analysis of the hoop tensile test and pressure test was performed using FEM software, and the results of the actual physical property test were reviewed. The property test and numerical analysis were compared, and very similar results were obtained with deviations of maximum tensile strength of 4.75% and fiber direction stress of 5.39%.