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Truc Tam Vu,Yuichiro Morishita,Itaru Yugue,Tetsuo Hayashi,Takeshi Maeda,Keiichiro Shiba 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.3
Study Design: Retrospective study. Purpose: To evaluate the radiological outcome of the surgical treatment of thoracolumbar burst fractures by using short segment posterior instrumentation (SSPI) and fusion. Overview of Literature: The optimal surgical treatment of thoracolumbar burst fractures remains a matter of debate. SSPI is one of a number of possible choices, yet some studies have revealed high rates of poor radiological outcome for this SSPI. Methods: Patients treated using the short segment instrumentation and fusion technique at the Spinal Injuries Center (Iizuka, Fukuoka, Japan) from January 1, 2006 to July 31, 2012 were selected for this study. Radiographic parameters such as local sagittal angle, regional sagittal angle, disc angle, anterior or posterior height of the vertebral body at admission, postoperation and final observation were collected for radiological outcome evaluation. Results: There were 31 patients who met the inclusion criteria with a mean follow-up duration of 22.7 months (range, 12–48 months). The mean age of this group was 47.9 years (range, 15–77 years). The mean local sagittal angles at the time of admission, post-operation and final observation were 13.1°, 7.8° and 14.8°, respectively. There were 71% good cases and 29% poor cases based on our criteria for the radiological outcome evaluation. The correction loss has a strong correlation with the load sharing classification score (Spearman rho=0.64, p <0.001). Conclusions: The loss of kyphotic correction following the surgical treatment of thoracolumbar burst fracture by short segment instrumentation is common and has a close correlation with the degree of comminution of the vertebral body. Patients with high load sharing scores are more susceptible to correction loss and postoperative kyphotic deformity than those with low scores.
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A Safe Surgical Procedure for Old Distractive Flexion Injuries of the Subaxial Cervical Spine
Osamu Kawano,Takeshi Maeda,Eiji Mori,Itaru Yugue,Takayoshi Ueta,Keiichiro Shiba 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.6
Study Design: Retrospective review. Purpose: To describe a safe and effective surgical procedure for old distractive flexion (DF) injuries of the subaxial cervical spine. Overview of Literature: Surgical treatment is required in old cases when a progression of the kyphotic deformity and/or persistent neck pain and/or the appearance of new neurological symptoms are observed. Since surgical treatment is more complicated and dangerous in old cases than in acute distractive-flexion cases, the indications for surgery and the selection of the surgical procedure must be carefully conducted. Methods: To identify a safe and effective surgical procedure, the procedure selected, reason(s) for its selection, and associated neurological complications were investigated in 13 patients with old cervical DF injuries. Results: No neurological complications were observed in nine patients (DF stage 2 or 3) who underwent the anterior-posterior-anterior (A-P-A) method and two patients (DF stage 1) who underwent the posterior method. It was initially planned that two patients (DF stage 2) who underwent the P-A method would be treated using the Posterior method alone; however, anterior discectomy was added to the procedure after the development of a severe spinal cord disorder. Conclusions: The A-P-A method (anterior discectomy, posterior release and/or partial facetectomy, reduction and instrumentation, anterior bone grafting) is considered to be a suitable surgical procedure for old cervical DF injuries.
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Tsuneaki Takao,Seiji Okada,Yuichiro Morishita,Takeshi Maeda,Kensuke Kubota,Ryosuke Ideta,Eiji Mori,Itaru Yugue,Osamu Kawano,Hiroaki Sakai,Takayoshi Ueta,Keiichiro Shiba 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.3
Study Design: Retrospective case series. Purpose: To clarify the influence of cervical spinal canal stenosis (CSCS) on neurological functional recovery after traumatic cervical spinal cord injury (CSCI) without major fracture or dislocation Overview of Literature: The biomechanical etiology of traumatic CSCI remains under discussion and its relationship with CSCS is one of the most controversial issues in the clinical management of traumatic CSCI. Methods: To obtain a relatively uniform background, patients non-surgically treated for an acute C3–4 level CSCI without major fracture or dislocation were selected. We analyzed 58 subjects with traumatic CSCI using T2-weighted mid-sagittal magnetic resonance imaging. The sagittal diameter of the cerebrospinal fluid (CSF) column, degree of canal stenosis, and neurologic outcomes in motor function, including improvement rate, were assessed. Results: There were no significant relationships between sagittal diameter of the CSF column at the C3–4 segment and their American Spinal Injury Association motor scores at both admission and discharge. Moreover, no significant relationships were observed between the sagittal diameter of the CSF column at the C3-4 segment and their neurological recovery during the following period. Conclusions: No relationships between pre-existing CSCS and neurological outcomes were evident after traumatic CSCI. These results suggest that decompression surgery might not be recommended for traumatic CSCI without major fracture or dislocation despite pre-existing CSCS.
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특정 목적 렌더러에 특화된 분산 렌더링 관리 시스템의 설계 및 구현
이인(In Lee),강경규(Kyung-Kyu Kang),정유구(Yugu Jung),이재운(Jae-Woon Lee),김동호(Dongho Kim) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.2
본 논문은 클라이언트-서버 환경에서 렌더링 모듈을 이용하여 분산 렌더링 작업이 가능한 시스템의 설계 및 구현 기법에 대해 기술한다. 기존 상용 소프트웨어에서는 렌더링과 분산 환경 지원 모듈이 통합되어 동작하는 환경을 제공하고 있어 클라이언트와 서버에 각각 필요하지 않는 기능까지 설치해야 하고 특정 장면에 대한 렌더링 기능이 부족하더라도 사용할 수밖에 없는 문제점을 가지고 있다. 이러한 단점을 해결하기 위해 본 논문에서는 클라이언트와 서버에서 각각 동작하는 분산 렌더링 관리 시스템을 설계하였고 독립적으로 동작이 가능한 렌더링 모듈을 클라이언트에서 관리하도록 하였다. 서버는 각 클라이언트에게 렌더링 요청 후 렌더링 결과를 취합하여 최종적으로 시스템 사용자에게 렌더링 결과를 제공한다. This paper describes design and implementation of a distributed rendering management system using existing rendering module. Currently, most of 3D commercial software provide modeling, rendering and distributed environment in the whole package. So, the server and client should use the given renderer as is, without the required features. In this paper, we propose a distributed rendering management system that consist of rendering module and distributed rendering client-server. The rendering module can be executed independently and managed by the distributed rendering client. The server requests rendering for each connected client. After the execution, the server gathers rendering result from each client. After gathering, the server provides the rendering result to the user.
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