• Clinics in Shoulder and Elbow
• /
• v.13 no.1
• /
• pp.86-91
• /
• 2010

Purpose: To introduce mini-open rotator cuff repair using the anterolateral approach and evaluate its clinical outcomes and effectiveness. Materials and Methods: 59 consecutive cases of rotator cuff tearing which were treated with mini-open repair utilizing the anterolateral approach were evaluated. The population comprised 39 men and 20 women, with an average age of 56.6 years. An average follow-up time period was 26 months. Clinical outcomes were analyzed based on VAS, ADL, and ASES scores. Results: The average respective VAS, ADL, and ASES scores improved from 7.04, 12.37, and 35.32 preoperatively to 1.02, 27.20, and 90.08 postoperatively (p=0.000). There were 41 excellent, 11 good, 2 fair, and 5 poor results. There were satisfactory results in 52 cases (88.1%). There were no statistically significant differences between the final ASES scores and age, sex, duration of symptoms, tear size, and preoperative stiffness (p>0.05). Conclusion: Mini-open rotator cuff repair using the anterolateral approach effective in providing better visualization.

• Composites Research
• /
• v.20 no.4
• /
• pp.31-41
• /
• 2007

Dome shape design methods of Filament Winding (FW) composite pressure vessel, which can suggest various dome contour according to the external loading conditions, were investigated analytically and numerically. The performance indices(PV/W) of the pressure vessels with same cylinder radius and boss opening but different dome shape were evaluated by finite element analysis under the internal pressure loading condition. The analysis results showed that as the dome shape becomes flat, the performance index decreases significantly due to the reduced burst pressure. Especially, for the case of the high value of the parameter ro, the ratio between the radii of the cylinder part and the boss opening, the flat dome is disadvantageous in the aspect of the weight reduction, and additional reinforcing dome design technique should be required to increase the burst pressure. For example, above ro=0.54 condition, the dome shape change according to the loading condition could cause the low burst pressure and increase of composite weight in dome region and is not recommendable except for the special case that maximum inner volume or sufficient space between skirt and dome is the primary design objective. However, at ro=0.35, the dome shape change brings not so significant differences in the performance of FW vessel.

• Journal of Chest Surgery
• /
• v.42 no.3
• /
• pp.331-336
• /
• 2009

Background: Open surgical repair of abdominal aortic aneurysms was initiated by Dubost in 1952. Despite the rapid expansion of percutaneous endovascular repair, open surgical repair is still recognized for curative intent. We retrospectively analyzed surgical outcome, complications, and mortality-related factors for patients with abdominal aortic aneurysms over a 6 year period. Material and Method: We analyzed 18 patients who underwent surgery for abdominal aortic aneurysms between March 2002 and March 2008. The indications for surgery were rupture, a maximal aortic diameter >60 mm, medically intractable hypertension, or pain. Result: The mean age was $66.6{\pm}9.3$ years (range, $49\sim81$ years). Twelve patients (66.7%) were males a 6 patients were females. Extension of the aneurysm superior to the renal artery existed in 6 patients (33.3%), and extension to the iliac artery existed in 13 patients (72.2%). Five patients (27.8%) had ruptured aortic aneurysms. The mean maximal diameter of the aorta was $72.2{\pm}12.9$ mm (range, $58\sim109$ mm). Surgery was performed by a midline laparotomy, and 6 patients underwent emergency surgery. The mean total ischemic time from aorta clamping to revascularization was $82{\pm}42$ minutes (range, $35\sim180$ minutes). The mortality rate was 16.7%; the mortality rate for patients with ruptured aneurysms was 60%, and the mortality rate for patients with unruptured aneurysms was 0%. The postoperative complications included one each of renal failure, femoral artery and vein occlusion, and wound infection. The patients who were discharged had a long-term survival of $34{\pm}26$ months (range, $4\sim90$ months). Rupture and emergency surgery had a statistically significant mortality-related factor (p < 0.05). Conclusion: Emergency surgery for ruptured aortic aneurysms continues to have a high mortality, but unruptured cases are repaired with relative safety. Successfully operated patients had long-term survival. Even though endovascular aortic repair is the trend for abdominal aortic aneurysms, aggressive application should be determined with care. Experience and systemic support of each center is important in the treatment plan.

• Journal of the Korean Arthroscopy Society
• /
• v.16 no.1
• /
• pp.17-25
• /
• 2012

Purpose: The aim of this retrospective study was to evaluate the relationship between appearance and size of bone bruise and severity of anterior cruciate ligament (ACL) injury with magnetic resonance imaging (MRI), furthermore, to identify the mechanism of ACL injury by analyzing the footprint of bone bruise. Materials and Methods: Sixty-five subjects who was taken an MRI within 6 weeks after acute ACL injury were studied. All MRI showed ACL injury and associated bone bruises. Bone bruises were analyzed using Costa-Paz classification based on appearance and location and also scored using Kornaat bone bruise grading system based on size and location. The severity of the ACL injury was graded using a 4-point system (ie, grade 0-3) with oblique coronal MRI. Results: There was statistically significant correlation between Costa-Paz classification of bone bruises in lateral femoral condyle and grade of ACL injury. There were more type 2 lesions in partial tear group (grade 1, 2), however, type 3 lesions of Costa-Paz classification in complete tear group (P=0.037). Significant positive correlations were observed between Kornaat total bone bruise score and grade of ACL injury (P=0.014). Most common ACL injury mechanism was pivot shift injury. Other mechanisms were clip valgus injury, phantom foot injury, and hyperextension injury. Conclusion: It is highly suggested that appearance and size of bone bruise is related to severity of ACL injury after acute ACL injury. The foot print of bone bruise provides valuable clues to identify ACL injury mechanism.

• Journal of the Korean Arthroscopy Society
• /
• v.4 no.1
• /
• pp.19-24
• /
• 2000

Purpose : To clinically analyze 62 patients who had meniscal repair and compare the results according to methods of repair. Materials and Methods : Between May 1997 and June 1998, we repaired 68 torn menisci in 68 patients. There were 52 male and 10 female with an average age of 26.9 years(ranging from 6 to 51 years). We used Linvatec suture in 46 knees(group A)and meniscal arrow in 16 knees(B group). In six knees we used Linvatec and meniscal arrow both. These 6 knees were excluded and 62 of 68 repaired meniscus were analyzed in this study. Average follow-up period was 18.5 months(ranging 12 to 26 months). We evaluated clinical results by Tapper and Hoover's grading system and subjective symptoms of the patients. Results : There were excellent in 47 cases$(76\%)$, good in 12$(19\%)$ and fair in 3$(5\%)$. In group A, there were excellent in 35 cases$(76\%)$, good in 9$(20\%)$ and fair in 2$(4\%)$. In group B, there were excellent in 12 cases$(75\%)$, good in 3$(19\%)$ and fair in 1$(6\%)$. There was no significant differences in clinical results between two groups. But mean operative time taken for meniscus repair was 40 minutes in group A and 25 minutes in group B. Conclusion : We can obtain good clinical results with short operation time in meniscal repair by proper selection of methods of repair according to the type, location, and size of meniscal tear and associated lesions.

• Journal of the Korean Society of Safety
• /
• v.22 no.4
• /
• pp.110-116
• /
• 2007

There have been 3E problems of energy, economy and environment since the earth has its history. Especially, as the industrial society is highly developing, human need in daily life has also changed drastically. With the introduction of 40 hour working week system, more households enjoy picnics on weekends. More gas accidents take place on Saturdays and on Sundays than any other days of week. Consequently, this study tries to find out the influence of flame caused by the explosion of butane canister on the adjacent combustibles and people by simulating relevant quantity of TNT. In addition, the damage estimation was conducted by using API regulations. If the scale of the radiation heat is known by calculating the distance of flame influence from the explosion site, the damage from the site can be easily estimated. And the accident damage was estimated by applying the influence on the adjacent structures and people into the PROBIT model. According to the pro bit analyze, the spot which is 50cm away from the flame has 97% of the damage probability by the first-degree burn, 8% of the damage probability by the second-degree burn and 4% of the death probability by the fire.

• Journal of the Korean Society of Radiology
• /
• v.83 no.3
• /
• pp.597-607
• /
• 2022

The mediastinum is the most prevalent site of extragonadal teratomas. Patients with mediastinal mature teratomas are usually young adults, and the condition does not show significant sexual differences. Mediastinal teratomas are mostly located in the anterior mediastinum. Patients are usually asymptomatic, although they can have several complications when the teratomas become large or rupture. Most mediastinal teratomas can be diagnosed using CT. Diagnosing ruptured or malignant teratomas is challenging because of their atypical clinical and radiological presentations. In this article, we describe various manifestations of mediastinal teratomas, with an emphasis on radiologic features.

• Proceedings of the KIPE Conference
• /
• 2014.11a
• /
• pp.37-38
• /
• 2014

대형 버스 및 트럭 등과 같이 하중이 무거운 차량 같은 경우, 제동 부담이 아주 크다. 잦은 제동과 부하가 크기 때문에 마찰을 이용한 기존 방식의 브레이크들은 브레이크 파열 및 페이드 현상이 일어날 수 있다. 이러한 과부하를 분담하기 위해 현재 보조브레이크(리타더)를 사용하며, 이때의 제동에너지를 전기에너지를 회생하여 에너지를 절감하는 연구가 현재 활발히 진행되고 있다. 본 논문에서는 와전류를 이용한 전자기형 리타더의 해석 및 제어 방법을 다룰 것이며, 제동에너지를 전기에너지로 회생하기 위해 L-C 공진회로로 모델링하였다. 그리고 리타더에서 발생하는 전압을 간략히 다상변압기로 구현하였다. 제어장치의 구동펄스에 따라 바뀌는 공진회로의 전압을 분석하였으며, 이 전압을 제어하기 위한 제어기를 제안하였고 Matlab Simulink를 이용해 가상실험을 실행하였다.

• Progress in Medical Physics
• /
• v.21 no.3
• /
• pp.274-280
• /
• 2010

The purpose of this study was to analyze the effect of single-fraction stereotactic radiosurgery (SRS) for the treatment of 15 cases of cerebral arteriovenous malformations (AVMs). Between 2002 and 2009, of the 25 patients who had SRS for the treatment of cerebral AVM, 15 patients (6 men, 9 women) taken a digital subtraction angiography (DSA) over 12 months after SRS were included. We retrospectively evaluated the size, location, hemorrhage of nidus, angiographic changes on follow-up on the MR angiography and DSA, and clinical complications during follow-up periods. At a median follow-up of 24 months (range 12-89), complete obliteration of nidus was observed in all patients (100%) while residual draining veins was observed in 3 patients (20%). There was no clinical complication during the follow-up period except seizure in 1 patient. The mean nidus volume was 4.7cc (0.5~11.7 cc, SD 3.7 cc). The locations of nidus were in cerebral hemisphere in 11 patients, cerebellum in 2 patients, basal ganglia in 1 patient, and pons in 1 patient respectively. 9 cases were hemorrhagic, and 6 cases were non-hemorrhagic AVMs. The SRS with LINAC is a safe and effective treatment for cerebral AVMs when the follow up period is over 4 years. However, it is recommended to continue to follow up until the draining vein on arterial phase of follow up DSA disappears completely.

• Journal of Korean Orthopaedic Sports Medicine
• /
• v.4 no.1
• /
• pp.65-69
• /
• 2005

Numerous small fibrinous rice bodies are a common finding in joints afflicted with rheumatoid arthritis(RA) or seronegative arthropathy, Subacromial and subdeltoid bursitis of the shoulder associated with multiple rice body formation is a rare occurrence. To our knowledge, this is the first report to describe the arthroscopic treatment of massive rice bodies in both glenohumeral joint and subacromial-subdeltoid bursae combined with full thickness of rotator cuff in RA. Besides, the MR appearance of subacromial-subdeltoid bursal rice bodies have been previously described in only few recent reports. Therefore, we also describe the MR appearances subacromial-subdeltoid bursae associated with multiple rice bodies in RA.