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Search Results: 1 - 10 of 138589 matches for " K. Fukutake "
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Spontaneous Extracranial Vertebral Artery Dissociation: A Case Report and Review of the Literature  [PDF]
D. Kamakura, Y. Iida, K. Hasegawa, S. Tsuge, K. Fukutake, K. Nakamura, H. Takahashi, A. Wada
Open Journal of Orthopedics (OJO) , 2018, DOI: 10.4236/ojo.2018.86025
Abstract: We encountered a 36-year-old female who developed extracranial vertebral artery dissociation (EVAD), which is a rare condition in Japan. The disease developed with sudden severe right side neck pain and right upper arm pain. No abnormality was observed in the spinal canal, intervertebral discs, spinal cord, or nerve roots on MRI of the cervical spine, but dilation and double lumen were noted in the vertebral artery (VA) at the C4/5 level. The presence of aneurysm was confirmed by VA angiography, and EVAD was diagnosed. The symptoms were resolved by conservative treatment of pain, and the aneurysm shrank and disappeared with time on VA angiography. Even though neck and upper limb pain are the only clinical symptom and there is no brain dysfunction, such as disturbance of consciousness and vertigo, when symptoms develop acutely, this pathology should be included in differential diagnosis and orthopedists should carefully observe the vertebral artery, as well as the spinal canal, in evaluating cervical MRI.
Cerebral Infarction after Spine Surgery: Report of Two Cases  [PDF]
Katsunori Fukutake, Hiroshi Takahashi, Yuichiro Yokoyma, Yasuaki Iida, Ryo Takamatsu, Kazumasa Nakamura, Akihito Wada
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.34037
Abstract: There has been an increase in spinal surgery for the elderly, with a corresponding potential increase in perioperative complications. In our department, 1833 patients underwent spinal surgery under general anesthesia from April 2001 to October 2012, and 2 of 260 patients aged ≥75 years old had postoperative cerebral infarction. An analysis of the pathogenic mechanism and potential risk factors showed that a history of cerebral infarction was a significant risk factor. Blood pressure rapidly increased on arousal from anesthesia, and particularly on extubation. The change in blood pressure was examined as a potential risk factor for cerebral infarction, but no significant relationship was observed. This result requires further examination in more patients with cerebral infarction after spinal surgery.

A Case of Rectus Sheath Hematoma Due to Anticoagulants after Total Knee Arthroplasty  [PDF]
Wataru Shishikura, Hideyuki Aoki, Takashi Nakamura, Yoshiyasu Miyazaki, Takashi Saito, Ryo Takamatsu, Katsunori Fukutake, Kazuaki Tsuchiya
Open Journal of Orthopedics (OJO) , 2016, DOI: 10.4236/ojo.2016.66020
Abstract: Background: Hematoma in the rectus sheath is not common but if happens it will become major bleeding. Sometimes anticoaglation of deep vein thrombosis (DVT) causes the hematoma in the rectus sheath. Case Report: A 74-year-old female patient after total knee arthroplasty (TKA) due to osteoarthritis. Postoperation, residual DVT was noted in the right soleus vein on ultrasonography of the veins of the lower limbs. Anticoaglation was started 7.5 mg/day Arixtra for treatment of DVT. Anticoaglation was administered throughout rehabilitation, and abdominal pain developed on postoperative day 9. Since respiratory distress developed on day 10, then thoracoabdominal contrast CT was performed. Although no PE was observed, a hematoma was detected in the rectus sheath, and it perforated into the abdominal cavity. The hemoglobin level was reduced by about 4 g/dL, and the patient was admitted to the ICU. Surgical treatment was not performed, anticoagulant treatment was discontinued, and conservative treatment was administered. During management in the ICU, a total of 24 units of red blood cells were transfused. Conclusions: Rectus sheath hematoma should be in mind of surgeons during differential diagnosis of acute abdominal pain especially in patients receiving anticoagulants. Early recognition can be of great importance for patients’ recovery, preventing from severe complications. Management is usually supportive although surgical intervention in some patients should be considered.
Evaluation of Conservative Treatment of Acute Fracture of the Odontoid Process of Axis with a Halo-Vest  [PDF]
Yuichiro Yokoyama, Hiroshi Takahashi, Yasuaki Iida, Yasuhiro Inoue, Keiji Hasegawa, Daisuke Suzuki, Shintaro Tsuge, Wataru Shishikura, Katsunori Fukutake, Ryo Takamatsu, Kazumasa Nakamura, Akihito Wada
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.37054
Abstract: We fitted a halo-vest on patients with a fracture of the odontoid process of the axis and evaluated the effects of conservative treatment on cervical muscular atrophy and the number and type of patient complaints after bone union. Four patients had Anderson Type II fractures and 6 patients had Type III fractures. Bone union was observed in all patients within 3 months after injury. After halo-vest fitting, cervical muscular atrophy increased with time, however, it gradually improved after removal of the halo-vest. Patients fixed with a halo-vest for more than 10 weeks complained of cervical discomfort and limited range of motion. No patients with fixation for less than 10 weeks had problems in bone union or had cervical complaints. Thus, less than a 10-week fixation period was considered to be appropriate.
Successful Treatment of Spine Fracture for Diffuse Idiopathic Skeletal Hyperostosis with Teriparatide—A Report of Two Cases  [PDF]
Yasuaki Iida, Hiroshi Takahashi, Yuichiro Yokoyama, Yasuhiro Inoue, Daisuke Suzuki, Keiji Hasegawa, Shintaro Tsuge, Wataru Shishikura, Katsunori Fukutake, Ryo Takamatsu, Kazumasa Nakamura, Masayuki Sekiguchi, Akihito Wada
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.36051
Abstract: We experienced 2 cases of spinal fracture in patients aged 80 years or older with diffuse idiopathic skeletal hyperostosis (DISH). Since they decided not to undergo surgical treatment, we provided conservative treatment with teriparatide. There has been no previous study on teriparatide for spine fracture in DISH. This is the first report of the successful use of teriparatide to treat spine fracture in DISH without surgical intervention. Our patients were treated with teriparatide for 8-9 months after diagnosis of the fracture. Union was obtained in two cases and no adverse events were observed during treatment. Our report showed that teriparatide could be an alternative to conventional intervention in spinal fracture of DISH.
Treatment of Renal Cell Carcinoma with 2-Stage Total en bloc Spondylectomy after Marked Response to Molecular Target Drugs
Yasuhiro Inoue,Hiroshi Takahashi,Yuichiro Yokoyama,Yasuaki Iida,Katsunori Fukutake,Ryo Takamatsu,Kazumasa Nakamura,Akihito Wada
Case Reports in Orthopedics , 2013, DOI: 10.1155/2013/916501
Abstract: Metastatic renal cell carcinoma of the bone occurs at a high rate, and the prognosis is poor. In general, total en bloc spondylectomy is considered when there is only one vertebral metastasis and the primary disease is treated. However, palliative surgery is selected when the primary disease is not being treated or metastasis occurs to an important organ. We encountered a patient in whom lung and vertebra metastases were already present at the time of the first examination at our department and the prognosis was considered poor. However, molecular targeted therapy was markedly effective and enabled 2-stage total en bloc spondylectomy. As of one year after total en bloc spondylectomy, the condition has improved to cane gait, and surgery for lung metastasis is planned. Molecular target drugs might markedly change the current therapeutic strategy for renal cell carcinoma. 1. Introduction Treatment of metastatic renal cell carcinoma of the spine includes chemotherapy, radiotherapy, and surgical resection. While the therapeutic strategy is changing with the appearance of molecular target drugs, the prognosis of patients with this disease remains generally poor. We encountered a patient with metastatic renal cell carcinoma of the spine for whom 2-stage total en bloc spondylectomy was able to be performed because the molecular target drugs were markedly effective. 2. Case The patient is a 49-year-old male; and his chief complaint is gait disturbance with a past medical history of duodenal ulcer. History of the Present Illness. The patient experienced right abdominal pain and was diagnosed as having a duodenal ulcer by a physician 4 years before. During further examination and treatment, a 4?cm mass was found in the right kidney on abdominal CT. The mass was diagnosed as a right renal cancer at the urology department of our hospital and was treated with nephrectomy. The histopathological diagnosis was clear cell carcinoma. Upon examination of the whole body, metastases were noted in the right lung and Th11 vertebra, and radiotherapy was initiated for these metastatic lesions. Treatment with a molecular target drug, Sorafenib, was initiated one month later, but both pulmonary and spinal lesions remained progressive. Thus, the drug was switched to another molecular target drug, Sunitinib, 2 months later. The progression of the metastatic lesions was prevented, but spinal deformity progressed slowly, and numbness had appeared in the bilateral lower limbs 1.5 years before. The patient gradually became unable to walk about one year before, and was referred to our
Spontaneous Symptomatic Pseudoarthrosis at the L2-L3 Intervertebral Space with Diffuse Idiopathic Skeletal Hyperostosis: A Case Report
Keiji Hasegawa,Hiroshi Takahashi,Yasuaki Iida,Yuichirou Yokoyama,Katsunori Fukutake,Ryo Takamatsu,Kazumasa Nakamura,Daisuke Suzuki,Wataru Shishikura,Shintaro Tsuge,Masayuki Sekiguchi,Akihito Wada
Case Reports in Orthopedics , 2013, DOI: 10.1155/2013/497458
Abstract: Pseudoarthrosis at the intervertebral space in patients with ankylosing spondylitis has occasionally been reported, but symptomatic pseudoarthrosis at the intervertebral disc level is rare in patients with diffuse idiopathic skeletal hyperostosis (DISH). Here, we report a case of symptomatic pseudoarthrosis at the L2-L3 intervertebral space that was diagnosed based on clinical history. We first performed L1–L5 fixation, but back-out of the pedicle screw occurred in the early postoperative phase and may have been caused by a short fixation range and concomitant Parkinson’s disease. However, the prognosis of the case was favorable after a second surgery. This case indicates that a fixation range of at least 3 above and 3 below is necessary for bone fracture of a thoracolumbar vertebra and pseudoarthrosis in patients with DISH. 1. Introduction The ankylosed spine is prone to fracture after minor trauma due to its biomechanical properties. In patients with diffuse idiopathic skeletal hyperostosis (DISH), most fractures occur at the vertebral body, whereas in patients with ankylosing spondylitis (AS), fractures occur at similar rates at the vertebral body and intervertebral disc [1]. Pseudoarthrosis of the spine at the vertebral interspace in AS has been described [2–4], but this condition combined with painful motion at the site of pseudoarthrosis and an absence of a history of trauma is very rare in patients with DISH [5, 6]. Here, we report a case of DISH with spontaneous symptomatic pseudoarthrosis at the L2-L3 intervertebral space. The patient was treated successfully by posterior spinal instrumentation and bone grafting. 2. Case Report A 76-year-old man presented with a 5-year history of low back pain. During this period, he had been repeatedly admitted to and discharged from a nearby hospital for lumbar pain. However, he had experienced particularly severe pain for 1 month without trauma and had difficulty walking and lying down due to pain in both lower extremities, and he was referred to our hospital. He had a history of Parkinson’s disease and was receiving drug therapy in the Department of Neurology. He had a Hoehn-Yahr classification of III. At his first visit to our hospital, the range of motion of the trunk was severely restricted due to pain. A femoral nerve stretch test was positive and hypesthesia was noted in the bilateral L3 region. Laboratory studies showed that the white blood cell count, erythrocyte sedimentation rate, and C-reactive protein level were normal and that HLA-B27 was negative without findings of sacroiliac arthritis.
The Constrained Mean-Semivariance Portfolio Optimization Problem with the Support of a Novel Multiobjective Evolutionary Algorithm  [PDF]
K. Liagkouras, K. Metaxiotis
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.67B005

The paper addresses the constrained mean-semivariance portfolio optimization problem with the support of a novel multi-objective evolutionary algorithm (n-MOEA). The use of semivariance as the risk quantification measure and the real world constraints imposed to the model make the problem difficult to be solved with exact methods. Thanks to the exploratory mechanism, n-MOEA concentrates the search effort where is needed more and provides a well formed efficient frontier with the solutions spread across the whole frontier. We also provide evidence for the robustness of the produced non-dominated solutions by carrying out, out-of-sample testing during both bull and bear market conditions on FTSE-100.

Design of a Cantilever - Type Rotating Bending Fatigue Testing Machine  [PDF]
K. K. Alaneme
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1011078
Abstract: This research is centered on the design of a low–cost cantilever loading rotating bending fatigue testing machine using locally sourced materials. The design principle was based on the adaptation of the technical theory of bending of elastic beams. Design drawings were produced and components/materials selections were based on functionality, durability, cost and local availability. The major parts of the machine: the machine main frame, the rotating shaft, the bearing and the bearing housing, the specimen clamping system, pulleys, speed counter, electric motor, and dead weights; were fabricated and then assembled following the design specifications. The machine performance was evaluated using test specimens which were machined in conformity with standard procedures. It was observed that the machine has the potentials of generating reliable bending stress – number of cycles data; and the cost of design (171,000 Naira) was lower in comparison to that of rotating bending machines from abroad. Also the machine has the advantages of ease of operation and maintenance, and is safe for use.
Wireless Sensor Network Lifetime Enhancement Using Modified Clustering and Scheduling Algorithm  [PDF]
K. Ramesh, K. Somasundaram
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78154
Abstract: Random distribution of sensor nodes in large scale network leads redundant nodes in the application field. Sensor nodes are with irreplaceable battery in nature, which drains the energy due to?repeated collection of data and decreases network lifetime. Scheduling algorithms are the one way?of addressing this issue. In proposed method, an optimized sleep scheduling used to enhance the?network lifetime. While using the scheduling algorithm, the target coverage and data collection?must be maintained throughout the network. In-network, aggregation method also used to remove the unwanted information in the collected data in level. Modified clustering algorithm?highlights three cluster heads in each cluster which are separated by minimum distance between them.?The simulation results show the 20% improvement in network lifetime, 25% improvement in?throughput and 30% improvement in end to end delay.
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