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권찬,조상헌,이승철,어수락 대한수부외과학회 2014 대한수부외과학회지 Vol.19 No.4
Ganglion cyst is the most common benign tumor arising from the hand and wrist. Rarely, they are found within the tendon. To date, only 10 cases in English papers and 7 cases in domestic papers on ganglion cysts in extensor digitorum tendons have been reported. Due to the rarity of this entity, it is difficult to sus- pect intratendinous ganglion fully based on the physical examination. Accordingly, preoperative studies such as ultrasonography, magnetic resonance imaging are recommended when suspicious result is revealed on the physical examination. Treatment should include en bloc resection of the affected tendon to reduce recurrence. But functional loss always has to be considered. This study reports two cases of intratendinous ganglion cysts that arised from the second and fourth extensor digitorum tendon. 결절종은 수부에서 가장 흔하게 발생하는 종양이다. 드물게 건 내에 발생하기도 하는데 현재까지 지신건에서 발생한 결절종은 전세계적으로 총 10건 만이 보고되었다. 발생 빈도가 낮은 이 질환을 이학적 검사만으로 감별하기는 어렵기 때문에 검진상 건내 결절종이 의심되는 경우 초음파나 자기공명영상 같은 추가적인 검사를 시행하는 것이 좋다. 치료는재발 방지를 위해 침범된 일괄 절제하는 것이 좋으나 기능적인 손실을 항상 염두 해야 한다. 저자들은 2, 4번째 지신건에 발생한 건내 결절종 2예를 보고하는 바이다.
원위교통동맥 기저 역행성 족배피판을 이용한 전족부 결손의 재건
권찬,조상헌,어수락,Kwon, Chan,Cho, Sang Hun,Eo, Su Rak 대한미세수술학회 2013 Archives of reconstructive microsurgery Vol.22 No.1
A 31-year-old female patient presented with a skin and soft tissue defect measuring $8{\times}6cm$ in size with exposure of the extensor hallucis longus tendon and the first metatarsal bone after metatarsal lengthening for brachymetatarsia. The defect was covered with a distally based dorsalis pedis flap based on the distal communicating branch of the dorsalis pedis artery. Secondary defect was covered by a split thickness skin graft. There was congestion of the flap tip after the operation; however, it was resolved using medical leeches and anti-coagulants. No necrosis or infection was encountered and the contour of the flap was satisfactory. There was no donor site morbidity. Reverse dorsalis pedis flap has not been commonly used due to the anatomical variation and uncertainty, which is different from the reverse radial forearm flap. However, when faced with the challenge of a moderate soft tissue defect of the distal forefoot, we believe that the reverse dorsalis pedis flap offers a good option with various advantages.
D. Min(민다해),C. Kwon(권찬이),J. Seo(서지인),M. Kim(김민지),B. Kim(김보배),T. Lee(이태용) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
FEM allows developing shoes more simply and efficiently by reflecting various designs and properties of materials in a short time. In this study, we applied FEM in developing MCS functional shoes considering the COP(Center of Pressure) trajectory of foot. We performed a case study to find the optimal boundary conditions. Then, another case study of the material and thickness of the midsole was performed to derive an optimal model. The optimal model is 10mm thickness of the mid-foot midsole, Phylon Sheet material in Top midsole, and IU Sheet material in the Bottom midsole. Using FEM simulation, we compared structural behavior such as stress, strain, and plantar pressure distribution which are difficult to measure with in-vivo experiments. As a result of biomechanical experiments with the prototype, the muscle fatigue decreased by 0.7%, knee abduction moment decreased by 1.24% and the maximum mean pressure decreased by 3.45% comparing to Nike walking shoes. FEM can improve efficiency of the product development process by predicting response characteristics of various designs and applying optimal cases to prototype designs. Thus, we expect FEM may innovate the shoe industry and help smooth sailing.