Publications by authors named "Gentaro Kumagai"

Introduction: This study aimed to standardize perioperative interruption of antiplatelet agents in patients undergoing cervical spinal surgery and investigate the incidence of epidural hematoma and thrombotic complications.

Methods: A total of 153 patients, consisting of 85 men and 68 women, were included in this study. Their mean age was 65.

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Introduction: Spinal cord injury (SCI) is a devastating injury and remains one of the largest medical and social burdens because of its intractable nature. According to the recent advances in stem cell biology, the possibility of spinal cord regeneration and functional restoration has been suggested by introducing appropriate stem cells. Multilineage-differentiating stress enduring (Muse) cells are a type of nontumorigenic endogenous reparative stem cell.

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: Abdominal vascular injury, a fatal complication of lumbar disc surgery, should concern spine surgeons. This study aimed to compare the position of the abdominal arteries in the supine and prone positions and the factors involved. Thirty patients who underwent lumbar surgery by posterior approach were included.

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This study aimed to clarify the association between swallowing disorder and prevertebral hyperintensity on magnetic resonance imaging (MRI) in patients with cervical spinal cord injury (CSCI) without a major fracture. This retrospective observational study included 30 patients who were diagnosed with acute CSCI without a major fracture (mean age: 69.3 years, 27 men).

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Background: Bone marrow lesion (BML) is an important magnetic resonance finding (MRI) finding that predicts knee osteoarthritis. The purpose of this study was to investigate the influence of proximal tibial morphology on BML, including the spreading root sign (SRS), in women without radiographic knee osteoarthritis (OA). It was hypothesized that varus alignment and a greater posterior tibial slopes (PTS) are associated with BML.

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Purpose: There are few reports regarding the association between the neutrophil-lymphocyte ratio (NLR), uric acid, and the development of postoperative delirium (POD) in patients who are undergoing spine surgeries. We investigated the associations between the NLR, uric acid as a natural antioxidant, and POD in elderly patients undergoing degenerative spine surgery.

Patients And Methods: This was a single-center, observational, and retrospective study conducted in Japan.

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The Injury Severity Score (ISS) is widely used to evaluate patients with multiple injuries. This study investigated the association between ISS and clinical outcomes of patients with spinal cord injury (SCI) in an aging Japanese population. This retrospective cohort study investigated patients admitted to a Japanese university hospital.

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Background: Osteoid sacral osteomas are rare. Patients present with severe lower back pain and, rarely, sciatic nerve symptoms.

Case Presentation: Herein, we report a patient with delayed diagnosis with complaints of severe lower back pain and sciatic nerve symptoms compressed by a sacral osteoid osteoma.

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Purpose: This study aimed to evaluate the association between cervical atherosclerosis on Doppler ultrasonography and postoperative delirium (POD) in patients undergoing spinal surgery.

Methods: In this retrospective observational study using prospectively collected data, 295 consecutive patients aged > 50 years underwent spine surgery at a single institution between March 2015 and February 2021. Cervical atherosclerosis was defined as the intima-media thickness (IMT) of the common carotid artery (CCA) being ≥ 1.

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Spinal cord injury (SCI) is a serious neurological disorder, with the consequent disabilities conferred by this disorder typically persisting for life. Multilineage-differentiating stress-enduring (Muse) cells are endogenous stem cells that can be collected from various tissues as well as from mesenchymal stem cells (MSCs); additionally, these Muse cells are currently being used in clinical trials. The anti-inflammatory effect of stem cell transplantation prevents secondary injuries of SCI; however, its effect on Muse cells remains unclear.

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Neuroinflammation occurs in the acute phase of spinal cord injury (SCI) and inhibits neural regeneration. In mouse models, etizolam (ETZ) is a strong anxiolytic with unclear effects on SCI. This study investigated the effects of short-term administration of ETZ on neuroinflammation and behavior in mice after SCI.

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Introduction: The aim of this study was to investigate the association of methicillin-resistant coagulase-negative staphylococci (MRCNS) on preoperative skin and surgical site infections (SSIs) in patients undergoing spinal surgery.

Methods: A total of 507 cases (239 males and 268 females; mean age: 56.1 years) were included in this retrospective study, using prospectively collected data.

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Purpose: To determine the frequencies of various diseases associated with all types of early-onset scoliosis, both idiopathic and nonidiopathic.

Methods: Retrospective collection of patients within a 21-year interval. Children under 10 years old presenting with scoliosis were included.

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Purpose: The diagnosis and classification of ossification of the posterior longitudinal ligament (OPLL) can be difficult with radiography alone; therefore, computed tomography (CT) is also usually performed. There are many reports on the usefulness of digital tomosynthesis (DTS) for image analysis in orthopedics. This study aimed to compare the accuracy of DTS with radiography and CT for the diagnosis and classification of cervical OPLL (C-OPLL).

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Study Design: This was a retrospective multicenter study.

Objective: To develop a novel progression risk stratification scoring system for early-onset scoliosis.

Summary Of Background Data: There is a lack of investigations into variables affecting the risk of curve progression in early-onset scoliosis, which prevents stratification.

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Study Design: This is a retrospective study.

Purpose: This study assessed risk factors accounting for urinary tract infections (UTIs) to determine whether preoperative asymptomatic UTI (aUTI) could be used to predict UTIs in patients after spinal surgery.

Overview Of Literature: UTI is a spinal surgery complication that increases the incidence of surgical site infections.

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This study aimed to investigate the relationship between the cross-sectional area of the dural sac (DCSA) and lower urinary tract symptoms (LUTS). This study included 270 Japanese participants from a community health check-up in 2016. Overactive bladder (OAB) was diagnosed during the assessment of LUTS.

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Objective: This study aimed to investigate whether disruption of the repaired nuchal ligament (NL) affects clinical outcomes following posterior cervical spine surgery.

Methods: This retrospective study included 101 patients (65 males, 36 females) who underwent posterior cervical spine surgery, 69 of whom received laminoplasty (LP), and 32 posterior decompression and fusion (PDF). The NL was split during the surgical approach and repaired at the time of wound closure.

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Background Context: Despite the many advances in understanding and treating early-onset scoliosis, the incidence and prevalence of this disease in the population remains unknown. Such knowledge is important for guiding clinical practice, directing research and raising awareness.

Purpose: To identify the incidence and prevalence of early-onset scoliosis, including all categories, within the population.

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Although minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) is the most common procedure in minimally invasive spine stabilization (MISt), details of the technique remain unclear. This technical report shows the mid-long-term clinical outcomes in patients who underwent posterior oblique square decompression (POSDe) with the three-step wanding technique of tubular MIS-TLIF for degenerative lumbar disease. Tubular MIS-TLIF (POSDe) was performed on 50 patients (males, 19; age, 69.

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