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김도근,오창현,이명석,윤승환,박형천,박종운 대한척추신경외과학회 2011 Neurospine Vol.8 No.4
Objective: The authors surveyed the prevalence and the clinical character of lumbar disc herniation(LDH) in Korean male adolescents, and the usefulness of current conscription criteria. Methods: The data of 39,673 nineteen-year-old males that underwent a conscription examination at the Seoul Regional Korean Military Manpower Administration(MMA) from October 2010 to May 2011 were investigated. For those diagnosed as having lumbar disc herniation, prevalences, subject characteristics, herniation severities, levels of herniation, and modi- fied Korean Oswestry low back pain disability scores by MMA physical grade were evaluated. The analysis was performed using medical certificates, medical records, medical images, and electromyographic and radiologic findings. Results: The prevalence of adolescent LDH was 0.60%(237 of the 39,673 study subjects), and the prevalence of serious adolescent LDH with thecal sac compression or significant discogenic spinal stenosis was 0.28%(110 of the 39,673 study subjects). Of the 237 adolescent LDH cases, 105(44.3%) were of single level LDH and 132(55.7%) were of multiple level LDH, and the L4-5 level was the most severely and frequently affected. Oswestry back pain disability scores increased with herniation severity(p<0.01), and were well correlated with MMA grade. Conclusions: In this large cohort of 19-year-old Korean males, the prevalence of adolescent LDH was 0.60% and the pre- valence of serious adolescent LDH, which requires management, was relatively high at 0.28%. MMA physical grade was confirmed to be a useful measure of the disability caused by LDH.
Prevalence and Insight of Scoliosis among Korean Male Adolescents by Chest Radiographs
김도근,윤승환,오창현,박형천,박종운,현동근 대한척추신경외과학회 2011 Neurospine Vol.8 No.3
Objective: We applied chest radiographs to scoliosis screening for conscription. Prevalence, types of scoliosis, and insight of examinees with scoliosis were investigated. Methods: In this study, chest radiographs of 2417 males, who had been given an examination for conscription at the Seoul Regional Military Manpower Administration from April 2009 to May 2009, were analyzed. The prevalence of scoliosis more than a 10 degrees Cobb angle was calculated. The insight of scoliosis was investigated in every examinee and thoracolumbar radiographs were checked in those examinees with more than a 20 degree Cobb angle. Results: Among 1904 males, 477 (19.7%) exhibited scoliosis involving more than a 5 degrees Cobb angle were and 131(5.4%) exhibitedmore than a 10 degree Cobb angle. In those 131 cases, 18 (13.7%) had a known history of problems with scoliosis. Among the group measuring less than a 10 degree Cobb angle, 1.7% of them misunderstood scoliosis. Insight of scoliosis increased according to the severity of spinal curvature; however, nearly half of the cases with a 20 degree or greater Cobb angle had no insight with respect to their scoliosis. Conclusion: In male adolescents, the prevalence of scoliosis with a greater than 10 degree Cobb angle was 5.4% and there was a low insight with respect to scoliosis. Objective: We applied chest radiographs to scoliosis screening for conscription. Prevalence, types of scoliosis, and insight of examinees with scoliosis were investigated. Methods: In this study, chest radiographs of 2417 males, who had been given an examination for conscription at the Seoul Regional Military Manpower Administration from April 2009 to May 2009, were analyzed. The prevalence of scoliosis more than a 10 degrees Cobb angle was calculated. The insight of scoliosis was investigated in every examinee and thoracolumbar radiographs were checked in those examinees with more than a 20 degree Cobb angle. Results: Among 1904 males, 477 (19.7%) exhibited scoliosis involving more than a 5 degrees Cobb angle were and 131(5.4%) exhibitedmore than a 10 degree Cobb angle. In those 131 cases, 18 (13.7%) had a known history of problems with scoliosis. Among the group measuring less than a 10 degree Cobb angle, 1.7% of them misunderstood scoliosis. Insight of scoliosis increased according to the severity of spinal curvature; however, nearly half of the cases with a 20 degree or greater Cobb angle had no insight with respect to their scoliosis. Conclusion: In male adolescents, the prevalence of scoliosis with a greater than 10 degree Cobb angle was 5.4% and there was a low insight with respect to scoliosis.
김도근,Igor Svadkovski,Seunghun Lee,Jong-Won Choi,Jong-Kuk Kim 한국물리학회 2009 Current Applied Physics Vol.9 No.3
In this work, various nanocomposite Ti–Si–N films have been deposited by hybrid coating system of double bending filtered vacuum arc source (DBFVAS) and magnetron sputtering techniques. Vacuum arc source has been used for the deposition of TiN and Si was incorporated by magnetron sputtering. The magnetic system of double bending filter consists of five solenoid coils and additional coil on the opposite side of vacuum chamber is supporting stabilization of the plasma flow onto substrate surface. Ti–Si–N film is deposited on the Si wafers and high speed steel (HSS) substrates with different Si content, which is controlled by magnetron current. As magnetron current increases from 0 to 1.5 A, Si content increases up to 18.2%. The deposition rate of Ti–Si–N coating layer is up to 17 nm/min. From the results Ti–Si–N coatings have been characterized as nanocomposites, consists of TiN crystallites and amorphous Si3N4. In this work, various nanocomposite Ti–Si–N films have been deposited by hybrid coating system of double bending filtered vacuum arc source (DBFVAS) and magnetron sputtering techniques. Vacuum arc source has been used for the deposition of TiN and Si was incorporated by magnetron sputtering. The magnetic system of double bending filter consists of five solenoid coils and additional coil on the opposite side of vacuum chamber is supporting stabilization of the plasma flow onto substrate surface. Ti–Si–N film is deposited on the Si wafers and high speed steel (HSS) substrates with different Si content, which is controlled by magnetron current. As magnetron current increases from 0 to 1.5 A, Si content increases up to 18.2%. The deposition rate of Ti–Si–N coating layer is up to 17 nm/min. From the results Ti–Si–N coatings have been characterized as nanocomposites, consists of TiN crystallites and amorphous Si3N4.