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균형 훈련 플레이트 시스템을 이용한 생체역학적 특성 연구
전성철,임희철,이창형,김태호,정덕영,전경진,Jun, SungChul,Lim, HeeChul,Lee, ChangHyung,Kim, TaeHo,Jung, DukYoung,Chun, KeyoungJin 대한의용생체공학회 2015 의공학회지 Vol.36 No.5
The purpose of this study was to investigate the unstable plate system for the advanced balance ability. 7 male volunteers (age $33.7{\pm}1.2$ years, height $174.7{\pm}3.8cm$, weight $86.0{\pm}3.6kg$, BMI $28.2{\pm}2.0kg/m^2$) performed the partial squat motion on the shape of CAP type(${\cap}$) and BOWL type(${\cup}$) plate system. The range of motion (ROM) and muscle activation were acquired by the motion analysis system and the EMG system. Results of ROMs of the CAP type plate system were shown the widely range of the deviation in the ankle joint on the sagittal plane (sagittal plane - hip joint $10.7^{\circ}$ > $5.4^{\circ}$, knee joint $16.3^{\circ}$ > $6.4^{\circ}$, ankle joint $18.8^{\circ}$ > $6.3^{\circ}$ ; transverse plane - hip joint $3.5^{\circ}$ > $1.8^{\circ}$, knee joint $5.3^{\circ}$ > $3.4^{\circ}$, ankle joint $11.3^{\circ}$ > $5.3^{\circ}$ ; frontal plane - hip joint $0.9^{\circ}$ > $0.5^{\circ}$, knee joint $0.8^{\circ}$ > $0.6^{\circ}$, ankle joint $4.8^{\circ}$ > $3.7^{\circ}$). Muscle activation results of the CAP type plate system were indicated higher in major muscles for balance performance than the BOWL type plate system (vastus lateralis 0.90 > 0.62, peroneus longus 0.49 > 0.21, biceps femoris 0.38 > 0.14, gastrocnemius 0.11 > 0.05). These findings may indicate that the CAP type plate system would expect better effectiveness in perform the balance training. This paper is primary study for developing balance skills enhancement training device.
Intrasellar Cavernous Hemangioma
전성철,이진석,양지호,이일우 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.36 No.2
The authors present a very rare case of an intrasellar cavernous hemangioma that mimick a pituitary macroadenoma radiologically. A 63-year-old male patient was admitted with visual field defect and clinical manifestations of pituitary failure. MR image revealed intrasellar gadolinium-enhancing tumor with parasellar extension suggesting pituitary macroadenoma. But pathology was cavernous hemangioma. It was suggested that cavernous hemangioma should be included in the differential diagnosis of pituitary mass.
Surgical Technique and Long-term Follow-up of Cervical Laminoplasty using Titanium Miniplates
전성철,조정기,박해관,이경진,나형균,김문찬 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.36 No.5
Objective : The authors report a simple and reliable method for cervical open-door laminoplasty secured by titanium miniplate. Methods : Sixteen patients with cervical myelopathy secondary to multilevel cervical spondylosis or ossification of the posterior longitudinal ligament were treated with an expansive open-door laminoplasty using titanium miniplates to stabilize the posterior elements described by O'Brien et al between February 1998 and June 2002, and all had a minimum of 6 months of follow-up(mean 22.5months) review. Plain radiographs were used to measure sagittal canal diameter and monitor construct integrity. The neurological outcome was evaluated before and after operation using the Japanese Orthopedic Association (JOA) scoring system for cervical myelopathy. Results : Only 1 titanium miniplate construct was failed out of 69 levels in 16 patients during follow-up period, but decompression was maintained. After surgery, in 15 patients(93.7%) different levels of clinical improvement were demonstrated, and in four of them(25%) full recovery was observed. The sagittal canal diameter and JOA score increased from 13.3±2.2mm and 9.19 preoperatively to 20±2.4mm and 12.88 postoperatively(p<0.01). Conclusion : The use of titanium miniplate to stabilize the posterior elements after laminoplasty is a simple, durable, and effective technique to maintain the increased sagittal canal diameter of the spinal canal and have another advantage of compatability of magnetic resonance imaging.
척추의 생체 역학적 분석을 위한 3 차원 유한요소 모델 구현
전성철,Wen-Ming Chen,박춘근,류경식,한승호,지원희,이권용,이성재 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
척추에 대한 생체 역학적 연구에는 동물이나 사체시편을 이용한 in vitro 실험 연구와 컴퓨터 시뮬레이션이 가능한 유한요소분석 등이 있다. 실험 연구와 달리 유한요소분석은 임상적 변수의 조절이 자유로우며, 이에 따른 다양한 결과를 예측분석하기에 적합한 방법으로 알려져 있다. 따라서 본 연구에서는 복잡한 구조를 갖는 척추의 생체 역학적 분석을 위해 사체 시편의 해부학적 데이터를 근거로 하여 3 차원 다분절 척추 유한요소 모델(L3-S1)을 구현한 후, 이를 같은 조건의 실험결과와 비교하여 검증하고자 하였다. 이를 위해 특별한 척추 질환이 없었다고 판정된 사체 시편(L1-S1)의 CT 를 촬영하였다. 획득한 CT 데이터로부터 외곽선을 추출하여 solid 모델을 개발한 후, mesh 작업을 하여 유한요소 모델을 개발하였다. 구축된 모델은 요추체, 디스크(섬유륜과 수핵), 그리고 주요 인대들로 구성되었다. 각 구성 요소의 물성치는 기존 문헌을 참조하여 설정하였다. 모델의 타당성을 검증하기 위해 단분절 유한요소 모델(L3-4)을 이용하여 하종판의 모든 절점을 구속하고 상종판에 2500N 의 압축 하중을 인가하여 상종판의 stiffness 을 산출하였다. 한편, 사체 시편의 일부분(L3-4)을 이용하여 유한요소 분석과 동일한 조건의 하중을 인가하여 추체 상종판의 stiffness 을 측정하여 유한요소 결과와 비교하였다. 유한요소 모델과 실험의 결과는 각각 1679.6N/㎜, 1849.2N/㎜ 로 거의 유사함을 보였다. 따라서 본 연구에서 구현된 유한요소 모델은 다양한 척추 시술법에 대한 임상적 분석에 이용이 가능할 것으로 사료된다.