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김성수,임동주,김진혁,김종우,엄규섭,안수형,석세일 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.6
Study Design: A retrospective study. Purpose: To determine the exact distal fusion level in the management of thoracolumbar/lumbar adolescent idiopathic scoliosis (TL/L AIS) using pedicle screw instrumentation (PSI). Overview of Literature: The selection of distal fusion level remains controversial in TL/L AIS. Methods: Radiographic parameters of 66 TL/L AIS patients were analyzed. The patients were grouped according to the distal fusion level; L3 group (fusion to L3, n=58) and L4 group (fusion to L4, n=8). The L3 group was subdivided into L3A (L3 crosses the mid-sacral line with rotation of less than grade II, n=33) and L3B (L3 does not cross the mid-sacral line or rotation is grade II or more, n=25) based on both bending radiographs. All of the patients in the L4 group had the same location and rotation of L3 in bending films as that of patients in the L3B group. An unsatisfactory result was defined as a lowest instrumented vertebral tilt (LIVT) of more than 10° or coronal balance of more than 15 mm. Results: Among the 3 groups, there was a significantly lesser correction in the TL/L curve and LIVT in the L3B group. Unsatisfactory results were obtained in 3 patients (9.1%) of the L3A group, in 15 patients (68.2%) of the L3B group, and in 1 patient (12.5%) of the L4 group with a significant difference. Conclusions: In TL/L AIS treatment with PSI, the curve can be fused to L3 with favorable radiographic outcomes when L3 crosses the mid-sacral line with rotation of less than grade II in bending films. Otherwise, fusion has to be extended to L4.
Bisphosphonate 복용과 연관된 대퇴골 비전형 골절
성열보 ( Yerl Bo Sung ),최정윤 ( Jung Yun Choi ),엄규섭 ( Kyu Sub Um ) 대한고관절학회 2013 Hip and Pelvis Vol.25 No.1
목적: 대퇴골 전자하부 및 간부 골절 환자들을 후향적으로 분석하여 bisphosphonate 복용군과 비복용군간의 비전형 대퇴 골절의 빈도, 임상적 및 방사선적 특징의 차이를 알아보고자 하였다. 대상 및 방법: 2001년 8월부터 2011년 10월까지 저에너지 대퇴골 전자하부 및 골간부 골절로 수술한 60세 이상 여자 환자 41명, 44예를 대상으로 bisphophonate를 복용 한 A군(19명, 22예)과 복용 안한 B군(22명, 22예)으로 나누었다. 복용 기간, 전구증상 유무, 방사선 소견을 조사하고, 나이, 골밀도 검사, 골유합 기간, 불유합 유무를 비교 분석하였다. 결과: A군에서 평균 복용 기간 56.8개월(12-132개월), 전구증상 1예, 모두 외측 피질골 비후, 횡적 골절, 내측 피질골 돌출이 관찰되었고, 반대측 피질골 비후 소견 15명(17예)(77.3%)이었다. 나이는 A군 73.2세, B군 78.2세로 유의한 차이를 보였다(P=0.021). 골밀도, 골유합 기간, 불유합 유무는 통계적 유의한 차이가 없었다. 결론: 대퇴골 비정형 골절은 외측 피질골 비후, 내측 피질골 돌출, 횡적 골절의 특징적 소견을 보이며 반대측 피질골 이상 소견을 동반한다. bisphosphonate를 장기복용 중인 골다공증 환자는 비전형 골절에 주의를 기울여야 한다. Purpose: We attempted to determine the differences in frequency, as well as clinical, radiologic characteristics of atypical femoral fracture between groups of patients who have taken bisphosphonate and those who have not by conduct of a retrospective analysis of patients with low energy subtrochanteric and shaft fractures of the femur. Materials and Methods: We conducted a retrospective study of 44 cases of 41 female patients over 60 years old who underwent surgery due to femoral shaft/subtrochanteric fractures from August 2001 to October 2011. The patients were divided into two groups: Group A, 22 cases in 19 patients with a history of bisphosphonate treatment; Group B, 22 cases in 22 patients without a history of bisphosphonate treatment as a control group. We assessed the duration of bisphosphonate treatment, presence of prodromal symptoms, and radiological results, and compared age, BMD results, union period, and nonunion rate between the two groups. Results: Mean medication period was 56.8 months(12-132 months) and prodromal symptoms were observed in one case. Lateral cortical thickening and transverse fracture with a medial cortical bone beak were observed in all patients of Group A, and contralateral cortical hypertrophy of the femur was noted in 15 patients(17 cases) (77.3%). Mean age was 73.2 years in Group A and 78.2 years in Group B, which showed significant difference (P=0.021), while no difference was observed in BMD, union period, and nonunion rate. Conclusion: An atypical femoral fracture can occur in the subtrochanteric or shaft of the femur. The typical radiological characteristics of this fracture are lateral cortical thickening and transverse fracture with a medial cortical bone beak and contralateral abnormality of cortical bone. Findings of this study suggest that medical practitioners should be careful of atypical fractures with osteoporosis patients who use prolonged bisphosphonate.
레이저 유도 백열법을 이용한 에틸렌 화염 배기에서의 Soot 입자 크기 계측에 관한 연구
전홍식(Hong Sik Chun),류훈철(Hoon Chul Ryu),박종일(Jong Il Park),엄규섭(Gyu Sub Eom),한재원(Jae Won Hahn),전광민(Kwang Min Chun) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Recently, particulate matter (PM) emission regulations are becoming more strict for diesel engines. There is increasing interest for measuring not only concentration, but also size of the particles. Laser -induced incandescence (LII) has emerged as a promising technique for measuring particle volume fraction and size. In this study, Simple time resolved LII (TIRE-LII) method was applied to the simulated exhaust of Ethylene diffusion flame as a preliminary test for measuring diesel exhaust PM emissions. The particle size results from LII technique were calibrated via field emission scanning electron microscope (FE-SEM) photograph. The inaccuracy of particle sizes between LII measurement and FE-SEM photograph was within 4.3%.