Publications by authors named "Yi Ko"

Background: Traditional surgery for degenerative thoracic disorder can be extremely invasive and accompanied by complications. Unilateral biportal endoscopy (UBE), a newly developed technique in the field of spin surgery, is minimally invasive and its popularity and indications have been increasing. In this study, we report three cases of different thoracic diseases treated using UBE.

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: This study investigated the relationship between spinal canal expansion and clinical outcomes in patients with myelopathy due to ossification of the posterior longitudinal ligament (OPLL) who underwent cervical open-door laminoplasty. : A retrospective study was conducted on 36 OPLL patients who underwent open-door laminoplasty between 2009 and 2021. Preoperative and two-year postoperative radiologic parameters, including bony canal area (BCA) and spinal canal area (SCA), were measured.

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Article Synopsis
  • * Postoperative assessments revealed that 56% of patients showed improvement in Nurick grade, and 48% improved in ECOG performance, with 20% experiencing significant perioperative complications.
  • * Logistic regression identified clinical factors such as ECOG status, psoas muscle index (PMI), and prognostic nutritional index (PNI) as significant predictors of improved ambulation post-surgery.
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The objectives of fusion surgery for spinal deformities include decompressing neural elements and achieving balanced spinal alignment. Particularly, in cases where spinal deformities coexist with osteoporosis, successful surgery requires careful consideration due to the susceptibility to fixation failure and non-union. Various efforts are being made to restore spinal alignment through surgery in osteoporotic patients.

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Article Synopsis
  • Revision spine surgery is complex due to scar tissue and anatomical variations, requiring careful planning and techniques, which is the focus of this note regarding lumbar unilateral biportal endoscopy (UBE).
  • The technique involves meticulous preoperative planning and a "pull-and-cut" method for effectively dealing with scar tissue, as demonstrated in two successful case studies involving recurrent disc herniations at the L4-5 level.
  • UBE offers a safe approach for spinal reoperations, achieving good patient outcomes due to its enhanced visualization, minimal blood loss, and quick recovery times.
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Purpose: Spinal tuberculosis, if not promptly treated, can lead to kyphotic deformity, causing persistent neurological abnormalities and discomfort. Spinal cord compression can occur due to ossification of the ligamentum flavum (OLF) at the apex of kyphosis. Traditional surgical interventions, including osteotomy and fixation, pose challenges and risks.

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: Teriparatide is an anabolic agent for osteoporosis and is believed to improve the bone healing process. Previous studies showed that teriparatide could enhance not only fracture healing but also spine fusion. It has been reported that use of teriparatide could promote the spine fusion process and decrease mechanical complications.

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Article Synopsis
  • - The study aimed to investigate the incidence and risk factors of proximal junctional failure (PJF) and distal junctional failure (DJF) in patients who underwent long lumbar fusion surgery stopping at L5, focusing on cases of adult spinal deformity.
  • - A retrospective review was conducted involving 63 patients with an average follow-up of about 7 years, revealing that PJF occurred in 27% and DJF in 25.4% of cases, with both types developing around similar time frames post-surgery.
  • - Significant risk factors identified for PJF included lower body mass index, higher preoperative lumbar lordosis, and higher postoperative sagittal vertical axis (SVA), while a higher preoperative SVA
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Coronavirus disease 2019 (COVID-19) has become a major health burden worldwide, with over 600 million confirmed cases and 6 million deaths by 15 December 2022. Although the acute phase of COVID-19 management has been established, the long-term clinical course and complications due to the relatively short outbreak is yet to be assessed. The current COVID-19 pandemic is causing significant morbidity and mortality around the world.

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Background: Patellar resurfacing is performed in total knee arthroplasty (TKA) to improve pain in the anterior compartment of the knee joint and to restore proper coordination and movement of the patellofemoral joint. The purpose of this study was to analyze differences in clinical outcomes according to patellar resurfacing in patients who underwent bilateral TKA.

Methods: Forty-three patients who underwent bilateral primary TKA with patellar resurfacing on one side only were included.

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Background: Untreated blunt cerebrovascular injuries (BCVIs) are associated with high rates of death and disability due to stroke. We assessed alignment of clinical practice at our centre with current recommendations for management of BCVIs and examined rates of new and recurrent in-hospital stroke.

Methods: We retrospectively reviewed the BC Trauma Registry to identify all adult (age > 18 yr) patients with trauma with BCVIs at the largest level 1 trauma centre in British Columbia, Canada, from Apr.

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The excellent physical and chemical properties of carbon nanomaterials render them suitable for application in gas sensors. However, the synthesis of carbon nanomaterials using high-temperature furnaces is time consuming and expensive. In this study, we synthesize a carbon nanomaterial using local laser-scribing on a substrate coated with a Cu-embedded polyimide (PI) thin film to reduce the processing time and cost.

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Carbon nanomaterials have attracted significant research attention as core materials in various industrial sectors owing to their excellent physicochemical properties. However, because the preparation of carbon materials is generally accompanied by high-temperature heat treatment, it has disadvantages in terms of cost and process. In this study, highly sensitive carbon nanomaterials were synthesized using a local laser scribing method from a copper-embedded polyacrylonitrile (CuPAN) composite film with a short processing time and low cost.

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Patient safety is the core goal of medical institutions. The present study focuses on the patient safety culture and staff well-being admit the COVID-19 pandemic. In a large metropolitan hospital group, 337 employees who had participated in the quality improvement interventions completed an anonymous questionnaire of patient safety culture and personal well-being.

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Alzheimer's disease (AD) is the most common neurodegenerative disease that leads to significant morbidities in elderly. The major pathological hallmark of AD is beta-amyloid plaques (Aβ) and intracellular neurofibrillary tangles (NFTs) deposition in hippocampus of the brain. These abnormal protein deposition damages neuronal cells resulting in neurodegeneration and cognitive decline.

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Background: Epinephrine is used in periarticular injection using ropivacaine to produce a synergistic effect when used with local anesthetic agents but the effect has not been proven yet. The purpose of this study is to evaluate how effective epinephrine is on postoperative clinical outcomes in primary total knee arthroplasty (TKA).

Methods: One hundred sixteen cases (89 patients) who underwent primary TKA were randomized into 2 groups depending on whether epinephrine was mixed.

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Background: Patients with rheumatoid arthritis (RA) have higher rate of osteoporosis and vertebral fracture than individuals without RA. This study aimed to compare the outcomes of balloon kyphoplasty (KP) performed to treat osteoporotic vertebral compression fracture (OVCF) in RA patients with the outcomes in non-RA patients.

Materials And Methods: The patients who received KP for OVCF and could be followed up at least 1 year were included in the study.

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Study Design: A retrospective study.

Objective: To evaluate the psychological changes and employment outcomes following corrective osteotomy in patients with ankylosing spondylitis (AS).

Summary Of Background Data: To date, no study has investigated the changes in psychological status and subsequent improvement in employment outcome after correction of kyphotic deformities in patients with AS.

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Background: Subacromial erosion remains a major concern after surgical fixation of acromioclavicular (AC) joint using a clavicular hook plate. To minimize postoperative subacromial erosion, we investigated the structural relationship between distal clavicle and acromion around the AC joint by considering the surgical fixation of the joint using the hook plate technique.

Methods: Computed tomography scans of 101 AC joints without any inherent pathology were analyzed.

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Background Context: Controversy exists regarding percutaneous balloon kyphoplasty (PBK) in patients with a very severe osteoporotic vertebral compression fracture (vsOVCF).

Purpose: The study was conducted to investigate the clinical and radiological outcomes of PBK for the treatment of vsOVCF compared with those of non-vsOVCF.

Study Design/setting: This is a retrospective, case-control study.

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Background: Although the natural history of vestibular schwannomas (VS) has been previously studied, few studies have investigated associated epidemiological factors, primarily because of the lack of large available cohorts.

Objective: The objective of this study was to perform a multi-scale geographical analysis of the period prevalence of VS in West Scotland from 2000 to 2015.

Methods: Adults diagnosed with sporadic VS were identified through the National Health Services of West Scotland database and geocoded to the unit postcode.

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Dedifferentiation of follicular cells is a central event in resistance to radioactive iodine and patient mortality in papillary thyroid carcinoma (PTC). We reveal that platelet derived growth factor receptor alpha (PDGFRα) specifically drives dedifferentiation in PTC by disrupting the transcriptional activity of thyroid transcription factor-1 (TTF1). PDGFRα activation dephosphorylates TTF1 consequently shifting the localization of this transcription factor from the nucleus to the cytoplasm.

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The prevalence of severe obesity in the elderly is increasing. This systematic review reviews the literature in reference to the efficacy and safety of bariatric surgery on the elderly patient ≥ 65 years. A comprehensive search of electronic databases was completed.

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Autotaxin is a secreted enzyme that converts extracellular lysophosphatidylcholine to lysophosphatidate (LPA). In cancers, LPA increases tumour growth, metastasis and chemoresistance by activating six G-protein coupled receptors. We examined >200 human thyroid biopsies.

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Leiomyosarcoma is a rare form of soft tissue neoplasm, with only 1% to 5% occurring in the head and neck region. Current recommended treatment suggests surgical excision with a wide lateral margin, but no definite guidelines regarding excisional margin have been established yet. Recently, complete excision with a narrow surgical margin has been recommended, and the authors present a case of cutaneous leiomyosarcoma on the face that was successfully managed by complete removal with a narrow excisional margin.

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