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골절부위에 생긴 혈종의 골막하 이식이 골형성에 미치는 영향에 관한 실험적 연구 - 골스캔 소견을 중심으로 -
이명철(Myung Chul Lee),양승오(Seoung Oh Yang),강흥식(Hung Sik Kang),장기현(Kee Hyun Chang),구경회(Kyung Hoi Koo),성상철(Sang Chul Seung),박인애(In Ae Park) 대한핵의학회 1990 핵의학 분자영상 Vol.24 No.1
N/A It has been reported that hematoma is one of the most crucial factors in fracture healing since callus formation is disturbed by washing out the hematoma near a fracture site. However, it is not clear why the hamatoma is important and how it plays a role during the fracture healing. In order to investigate the role of hematoma in the process of fracture healing, the osteogenic potential by subperiosteal transplantation have been studied. Experimental fractures by operation were made at the mid-shaft of the tibia in New Zealand white rabbits. Removal of hematoma at the fracture site was done after 2 and 3 days from experimental fracture, and the removed hematoma was transplanted into the subperiosteal area at the mid-shaft of the ulna of each rabbit. As control gorups, we have performed 3 different procedures 1) the hematoma was transplanted into the muscular layers at the thigh and forearm; 2) autologous blood clots were transplanted into the subperiosteal area of the ulna; and 3) sham operation without a transplantation into the subperiosteal area. After transplantation, seria bone scintigraphy and simple radiography were performed at 4 days, 1 week, and 2 weeks to detect an abnormality. The results of bone scintigraphy were positive in 5 of 6 experimental group. However, a11 in three control groups were negative. Histological observation of the positive bone revealed new bone formation with trabeculation. These results suggest the hematoma in fracture site has osteogenic potential in the subperiosteal area which can be demonstrable by bone scintigraphy and histologic findings. Therefore, it is considered that hematoma of the fracture site plays an important role in the process of fracture healing. Further biochemical investigation using various experimentaI models is mandatory to apply this preliminary result to the treatment of clinical delayed union or nonunion.
인공 슬관절 전치환술에서 대퇴 삽입물의 회전 정렬을 위한 원위 대퇴골의 해부학적 계측
장종범(Chong Bum Chang),성상철(Sang Cheol Seong),이상훈(Sahnghoon Lee),유재호(Jae Ho Yoo),이승환(Seung Hwan Rhee),이명철(Myung Chul Lee) 대한정형외과학회 2005 대한정형외과학회지 Vol.40 No.7
목적: 본 연구의 목적은 인공 슬관절 전치환술시 대퇴골 삽입물의 회전 정렬과 관련된 여러 가지 해부학적 지표들의 관계를 계측하고, posterior condylar axis를 회전 정렬의 척도로 적용할 때 고려해야 할 점을 제시하고자 함이다. 대상 및 방법: 건강한 지원자 40명(남자 20명, 여자 20명)의 40 슬관절을 대상으로 슬관절 신전위(0°)에서의 원위 대퇴골 축상면의 자기 공명 영상에서 임상적 transepicondylar axis (TEA), 외과적 transepicondylar axis, posterior condylar axis (PCA), 대퇴 전후 축(AP axis)들의 관계를 계측하였으며, 퇴행성 관절염의 모델로 대퇴 후과의 내, 외측 연골의 마모가 다른 경우를 가정하여 PCA와 TEA사이의 각도 변화를 계측하였다. 결과: 여러 척도 중 임상적 TEA는 AP axis과 수직의 관계를 보였으며 임상적 TEA와 PCA사이의 각도는 평균 5.4°였고 남자군은 평균 4.3°, 여자군은 평균 6.5°로 여자군에서 통계적으로 유의하게 큰 값을 보였다. 임상적 TEA와 외과적 TEA사이의 차이는 남자는 평균 3.2°, 여자는 평균 3.8°였다. 대퇴 후과 중 내측의 연골은 모두 마모되고 외측의 연골은 모두 보존된 상태를 가정하여 계측한 PCA에 의한 회전 정렬은 정상에 비하여 1.9°의 외회전이 추가됨을 알 수 있었다. 결론: 임상적 TEA와 외과적 TEA는 3° 이상 차이를 보이는 회전 정렬의 척도로서 수술 시 혹은 연구 논문에서 명확히 구별하여 적용되어야 할 것으로 사료된다. TEA와 PCA사이의 각도는 성별간 유의한 차이를 보이나 이는 추가의 검증이 필요할 것으로 사료된다. PCA를 이용하여 회전 정렬을 정하는 경우 관절 연골의 마모 정도의 차이에 따라 대퇴 치환물의 회전의 각도가 변하게 되므로 수술시 이점을 고려를 해야 한다. Purpose: We evaluated the relationship among the various rotational reference axes of femoral component in TKA, and the potential change in rotational alignment when a posterior condylar axis (PCA) was used as a reference for different cartilage erosions between the medial and lateral posterior femoral condyles. Materials and Methods: The study subjects included twenty male and twenty female volunteers. Axial MR image of the distal femur were used to measure the angles among the clinical transepicondylar axis (cTEA), surgical transepicondylar axis (sTEA), the PCA, and the AP axis. We then evaluated the difference in the amount of rotation between a normal and osteoarthritic model when the PCA was used as a rotational reference. Results: The mean angle between cTEA and PCA was 5.4 degrees, and it was significantly greater in the female (6.5 degrees) than in the male group (4.3 degrees). The cTEA demonstrated a perpendicular relationship with the AP axis in both groups. The average angles between cTEA and sTEA were 3.2 degrees in the male group and 3.8 degrees in the female group. When we assumed complete erosion of the cartilage on the medial posterior condyle with preservation on the lateral side, the angles between the cTEA and PCA decreased by an average of 1.9 degrees in both groups. Conclusion: This study suggests that the two transepicondylar axes, which demonstrated greater than 3 degrees in angle-difference, should be defined clearly in scientific reports and in their application as rotational references in TKA. Some significant gender differences in the rotational profile were noted. When the PCA is used as a rotational reference, potential errors caused by the different amounts of cartilage erosion between the medial and lateral posterior condyles should be considered.
전력기기용 히트파이프 냉각장치에서 온도 편차의 통계적 평가
한창우(Chang-Woo Han),성상철(Sang-Chul Sung),정승붕(Seung-Boong Jeong) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
The difference of the cooling performance between the heat sinks may vary depending on the operator or the time of production, even if a number of heat sinks are manufactured under the same process. And even in the same control algorithm and physical configuration, there is the difference of the electric loss between the power devices due to the current unbalance in the phase or between phases. In this paper, the deviation of the cooling performance of the heat sinks was statistically analyzed by measuring the temperature on the heat sink with heating blocks. The temperature of the heat sink with IGBT modules was then measured under various losses to assess the deviation of the cooling performance between heat sinks due to mechanical parameters such as the airflow rate and the electric parameters such as the current unbalance. As a result, the deviation of the cooling performance among a number of heat sinks was about ±5%, and the deviation of the cooling performance for the sub-system was found to be ±12%. The upper and lower specification limits on the IGBT stack compared to the heat sink component was increased due to uncontrollable factors such as the state of the power system. The heat sink with heat pipes applied the power conditioning system connected in a power system is expected to reduce the operating range by nearly 14% than ideal manufacturing and experimental conditions.
이명철,성상철,강승백 대한슬관절학회 1993 대한슬관절학회지 Vol.5 No.1
Over the past few years the arthroscope has played a major role in the evaluation and treatment of the chondral and osteochondral lesions of ankle joint. But its technique is very difficult and require considerable expertise with instrument. We reviewed 10 ankles in 10 patients who underwent arthroscopic treatment of the osteochondral lesion of ankle at Seoul National University Hospital from 1986 to 1991. The mean age at the time of surgery was 30 years (reange,16 to 49 years). There were eight males and two females, All patients had history of trauma and conservative treatment under the diagnosis of ankle sprain. The mean follow-up was 2 years and 9 months (range, 1 year and 2 months to 6 years and 7 months). Preoperative diagnosis were osteochondritis dissecans in 7 ankles, loose osteochondral body in one and degenerative arthritis in two through CT or MRI. Arthroscopic diagnosis were osteochondritis dissecans with crater and loose body in 6 ankles, loose osteochondral body with no osteochondral defect in one and posttraumatic degenerative arthritis in three. Six ankles with crater and loose body were treated with arthrosopic abrasion and loose body removal. One aknle with loose osteochondral body was treated with loose body removal and 3 ankles with degenerative arthritis were treated with resection of body spur and osteochondral ridge. At last follow up, 8 ankles showed excellent and two showed good result. Postoperatively one patient complained transient dorsal numbness and there were no permanent complications. Arthroscope would play a definite role in the diagnosis and treatment of the osteochondral lesions of ankle.