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Three-Dimensional Analysis of the Ideal Entry Point for Sacral Alar Iliac Screws
Watanabe Noriyuki,Takigawa Tomoyuki,Uotani Koji,Oda Yoshiaki,Misawa Haruo,Tanaka Masato,Ozaki Toshifumi 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.6
Study Design: This is a virtual three-dimensional (3D) imaging study examining computed tomography (CT) data to investigate instrumentation placement.Purpose: In this study, we aim to clarify the ideal entry point and trajectory of the sacral alar iliac (SAI) screw in relationship to the dorsal foramen at S1 and the respective nerve root.Overview of Literature: To the best of our knowledge, there is yet no detailed 3D imaging study on the ideal entry point of the SAI screw. Despite the evidence suggesting that the dorsal foramen at S1 is a landmark on the sacrum, the S1 nerve root disruption is a general concern during the insertion of SAI screws. No other study has been published examining the nerve root location at the S1and SAI screw insertions.Methods: Preoperative CT data from 26 patients pertaining to adult spinal deformities were investigated in this study. We applied a 3D image processing method for a detailed investigation. Virtual cylinders were used to mimic SAI screws. These were placed to penetrate the sacral iliac joint without violating the other cortex. We then assessed the trajectory of the longest SAI screw and the ideal entry point of SAI using a color mapping method on the surface of the sacrum. We measured the location of the nerve root at S1 in relation to the foramen at S1 and the sacral surface.Results: As per the results of our color mapping, it was determined that areas that received high scores are located medially and caudally to the dorsal foramen of S1. The mean angle between a horizontal line and a line connecting the medial edge of the foramen and nerve root at S1 was 93.5°. The mean distances from the dorsal medial edge of the foramen and sacral surface to S1 nerve root were 21.8 mm and 13.9 mm, respectively.Conclusions: The ideal entry point of the SAI screw is located medially and caudally to the S1 dorsal foramen based on 3D digital mapping. It is also shown that this entry point spares the S1 nerve root from possible iatrogenic injuries.
Development of safety system for electric wheelchair with thermography camera
Tomoyuki Ohkubo,Kazuyuki Kobayashi,Kajiro Watanabe,Yosuke Kurihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes the development of a safety system for electric wheelchairs applying a thermography camera, laser range finder, and head mounted display. The combination of thermography camera and laser range finder can detect obstacles and/or humans even in the dark. The main problem the thermography camera is the narrow viewing angle. To overcome this problem, we developed a real-time obstacle tracking system that consists of a thermography camera and laser range finder. The combination of devices achieves robust tracking without the time-consuming complicated image processing required in conventional obstacle tracking. To confirm the validity of the proposed approach, we tested the newly developed system in an actual environment.
Yuki Sakamoto,Tomoyuki Ohkubo,Kazuyuki Kobayashi,Kajiro Watanabe,Shuzo Matsuda,Yosuke Kurihara 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
According to a British black tea exporter, boiling water of ideal temperature is poured over tealeaves, more than half of the leaves will float while the rest drop to the bottom. Such a movement of tea leaves is well known as "jumping" phenomena. However, depending on the condition of the boiling water, it does not always occur "jumping". In order to analyze the "jumping" phenomena, we investigate automatic "jumping" phenomena through the teapot image sequence.
Connected Control Method for Four High-Rise Buildings Possessing Equal Height
Takahiro Takano,Tomoyuki Akita,Hiroyuki Toyoda,Toru Watanabe,Kazuto Seto 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
The connected control method (CCM) utilized reaction force between buildings as damping force by using connecting springs and dampers. The effectiveness of CCM has already been established in previous studies. In this paper, bidirectional internal connected control method (BICCM) with an experimental high-rise building split into four substructures is presented for a vibration control method to mitigate structural vibration by using internal damping force by CCM. Therefore, IBCCM is expected that is effective method for a high-rise building against large earthquake excitation. In this report, the effectiveness BICCM is investigated through computer simulations
Hiroyuki Toyoda,Takahiro Takano,Tomoyuki Akita,Toru Watanabe,Kazuto Seto 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
A novel combination of structures for connected-control mechanism (CCM) has been presented. By coupling base-isolated and ordinary structures, the vibration suppression effect of CCM is expected to be expanded. Experimental structures and CCM mechanism using magnetic dampers were built and excitation experiments were carried out. In the previous study, however, the achieved vibration suppression performance was not satisfactory. In study, to enhance the performance, spring elements are introduced. The spring constants are tuned according to so-called “fixed-point theory” The performance of the designed system is investigated experimentally.
( Takehiko Matsushita ),( Shu Watanabe ),( Daisuke Araki ),( Kanto Nagai ),( Yuichi Hoshino ),( Noriyuki Kanzaki ),( Tomoyuki Matsumoto ),( Takahiro Niikura ),( Ryosuke Kuroda ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-
Introduction: Previous studies have reported that alignment changes depend on the patient’s position in orthopedic surgery. However, it has not yet been well examined how the patient’s position affects the preoperative planning in high-tibial osteotomy (HTO). Therefore, the aim of this study was to investigate the effects of the patient’s position on preoperative planning in HTO. Materials and methods: A total of 60 knees in 55 patients who underwent HTO were retrospectively examined. Virtual preoperative planning for medial open-wedge HTO (OWHTO), lateral closed-wedge HTO (CWHTO), and hybrid CWHTO were performed by setting the percentage of the weight-bearing line (%WBL) at 62% as an optimal alignment. The correction angle differences between the supine and standing radiographs were measured. The virtual %WBL (v%WBL) was determined by applying the correction angle obtained from the standing radiograph to the supine radiograph. The %WBL discrepancy (%WBLd) was calculated as v%WBL - 62 (%) to predict the possible correction errors during surgeries. A single regression analysis was performed to examine the correlation between the correction angle difference and %WBLd. Results: The mean correction angle was significantly higher when the preoperative planning was based on standing radiographs than when based on supine radiographs (P < 0.001), and the mean difference was 2.2 ± 1.5°. The difference between the two conditions in the medial opening gaps for OWHTO, lateral wedge sizes (mm) for CWHTO, and hybrid CWHTO were 2.6 ± 2.0, 2.3 ± 1.6, and 1.9 ± 1.4, respectively. The mean v%WBL was 71.2% ± 7.3%, and the mean %WBLd was 10.1% ± 7.4%. A single regression analysis revealed a linear correlation between the correction angle difference and %WBLd (%WBLd = 4.72 × correction angle difference + 0.08). No statistically significant difference in the parameters was found between the supine and standing radiographs postoperatively. Conclusions: We found significant differences in the estimated correction angles between the supine and standing radiographs in the planning for HTO. Therefore, surgeons should carefully consider the difference between supine and standing radiographs and estimate the possible correction error during surgery when planning a HTO.