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Progressive Relapse of Ligamentum Flavum Ossification Following Decompressive Surgery

Ando K, Imagama S, Ito Z, Kobayashi , Ukai J, Muramoto A, Shinjo R, Matsumoto , Nakashima , Ishiguro N

Thoracic ossification of the ligamentum flavum (T-OLF) is a relatively rare spinal disorder that generally requires surgical intervention, due to its progressive nature and the poor response to conservative therapy....
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Utility of a Computed Tomography-Based Navigation System (O-Arm) for En Bloc Partial Vertebrectomy for Lung Cancer Adjacent to the Thoracic Spine: Technical Case Report

Kobayashi , Imagama S, Ito Z, Ando K, Yokoi K, Ishiguro N

We describe successful vertebrectomy from a posterior approach using a computed tomography (CT)-based navigation system (O-arm) in a 53-year-old man with adenocarcinoma of the posterior apex of the right lung...
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Spinal Metastasis from Struma Ovarii: Case Report and Review of the Literature

Kobayashi , Imagama S, Tsunekawa , Hosokawa K, Watanabe M, Ito Z, Ando K, Ishiguro N

Struma ovarii is a rare tumor that is defined as an ovarian teratoma with a thyroid tissue component exceeding 50%. Most of these tumors are benign, with malignant struma ovarii...
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Variety of the Wave Change in Compound Muscle Action Potential in an Animal Model

Ito Z, Imagama S, Ando K, Muramoto A, Kobayashi , Hida T, Ito K, Ishikawa Y, Tsushima M, Matsumoto , Tanaka S, Morozumi M, Matsuyama , Ishiguro N

STUDY DESIGN: Animal study. PURPOSE: To review the present warning point criteria of the compound muscle action potential (CMAP) and investigate new criteria for spinal surgery safety using an animal model. OVERVIEW...
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Outpatient Myelography: A Prospective Trial Comparing Complications after Myelography between Outpatients and Inpatients in Japan

Matsumoto , Imagama S, Inoue H, Aoki T, Ishiguro N, Osawa Y

STUDY DESIGN: Prospective comparative study. PURPOSE: To compare the incidence and severity of adverse reactions associated with myelography performed in outpatients vs. in inpatients and report the safety and usefulness of outpatient...
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Response to the Letter to the Editor: Evaluation of the Association between Neck Pain and the Trapezius Muscles in Patients with Cervical Myelopathy Using Motor Evoked Potential: A Retrospective Study

Ito S, Sakai Y, Harada A, Ando K, Kobayashi K, Nakashima H, Machino M, Kambara S, Inoue T, Hida T, Ito K, Ishiguro N, Imagama S

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Perioperative Management of Patients with Hemophilia during Spinal Surgery

Kobayashi , Imagama S, Ando K, Ito K, Tsushima M, Morozumi M, Tanaka S, Machino M, Ota K, Nishida Y, Ishiguro N

STUDY DESIGN: Single-center retrospective study. PURPOSE: To optimize the perioperative management of patients with hemophilia who are undergoing spinal surgery. OVERVIEW OF LITERATURE: Hemophilia is a rare disease in which there is...
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Efficacy of Anal Needle Electrodes for Intraoperative Spinal Cord Monitoring with Transcranial Muscle Action Potentials

Kobayashi , Ando K, Yagi H, Ito K, Tsushima M, Morozumi M, Tanaka S, Machino M, Ota K, Matsuyama , Ishiguro N, Imagama S

STUDY DESIGN: Retrospective study. PURPOSE: To examine the relationship between postoperative bowel bladder disorder (BBD) and the efficacy of needle electrodes for the external anal sphincter (EAS) in intraoperative spinal cord...
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Single-Stage Removal of Thoracic Dumbbell Tumors from a Posterior Approach Only with Costotransversectomy

Ando K, Imagama S, Wakao N, Hirano K, Tauchii R, Muramoto A, Matsui H, Matsumoto , Matsuyama , Ishiguro N

PURPOSE: Thoracic dumbbell tumors are relatively rare, usually arising from neurogenic elements. Methods for surgical removal thereof remain controversial. The purpose of this study was to evaluate the surgical results...
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Persistence of Denosumab Therapy among Patients with Osteoporosis

Kobayashi K, Ando K, Machino M, Morozumi M, Kanbara S, Ito S, Inoue T, Yamaguchi H, Ishiguro N, Imagama S

Study Design: Retrospective study in a single center. Purpose: To examine denosumab persistence in patients of different ages with severe osteoporosis in Japan. Overview of Literature: Denosumab is an antibody drug used...
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Evaluation of the Association between Neck Pain and the Trapezius Muscles in Patients with Cervical Myelopathy Using Motor Evoked Potential: A Retrospective Study

Ito S, Sakai Y, Harada A, Ando K, Kobayashi K, Nakashima H, Machino M, Kambara S, Inoue T, Hida T, Ito K, Ishiguro N, Imagama S

Study Design: Retrospective study. Purpose: We aimed to use motor evoked potentials (MEPs) to examine the association of electrophysiological assessment of the trapezius muscle with neck pain. Overview of Literature: Previous reports...
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The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up

Nakashima , Kanemura T, Satake K, Ito K, Ishikawa Y, Ouchida J, Segi N, Yamaguchi , Imagama S

Study Design: A retrospective cohort study. Purpose: The purpose of this study was to investigate the prevalence and risk factors for S2 alar-iliac (SAI) screw loosening following lumbosacral fixation, with a...
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Association between Postoperative Neck Pain and Intraoperative Transcranial Motor-Evoked Potential Waveforms of the Trapezius Muscles in Patients with Cervical Myelopathy Who Underwent Cervical Laminoplasty

Ito S, Sakai Y, Ando K, Nakashima H, Machino M, Segi N, Tomita H, Koshimizu H, Hida T, Ito K, Harada A, Imagama S

Study Design: Retrospective study. Purpose: Cervical laminoplasty is safe and effective for treating cervical myelopathy but has a higher frequency of postoperative axial pain compared to other methods. Several studies have...
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Scoliosis Caused by Limb-Length Discrepancy in Children

Kobayashi K, Ando K, Nakashima H, Machino M, Morozumi M, Kanbara S, Ito S, Inoue T, Yamaguchi H, Mishima K, Ishiguro N, Imagama S

Study Design: Single-center retrospective study in pediatric patients. Purpose: The purpose of the study was to investigate the effects of the presence and severity of leg-length discrepancy (LLD) on scoliosis in...
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Indirect Decompression Using Lateral Lumbar Interbody Fusion for Restenosis after an Initial Decompression Surgery

Nakashima H, Kanemura T, Satake K, Ito K, Ishikawa Y, Ouchida J, Segi N, Yamaguchi H, Imagama S

Study Design: Retrospective comparative study. Purpose: We compared clinical and radiographical outcomes after lumbar decompression revision surgery for restenosis by lateral lumbar interbody fusion (LLIF) and posterior lumbar interbody fusion (PLIF). Overview...
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Comparative Radiographic Outcomes of Lateral and Posterior Lumbar Interbody Fusion in the Treatment of Degenerative Lumbar Kyphosis

Nakashima , Kanemura T, Satake K, Ishikawa Y, Ouchida J, Segi N, Yamaguchi , Imagama S

STUDY DESIGN: Retrospective case–control study. PURPOSE: To compare surgical invasiveness and radiological outcomes between posterior lumbar interbody fusion (PLIF) and lateral lumbar interbody fusion (LLIF) for degenerative lumbar kyphosis. OVERVIEW OF LITERATURE:...
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Factors Affecting Postoperative Sagittal Alignment after Lateral Lumbar Interbody Fusion in Adult Spinal Deformity: Posterior Osteotomy, Anterior Longitudinal Ligament Rupture, and Endplate Injury

Nakashima , Kanemura T, Satake K, Ishikawa Y, Ouchida J, Segi N, Yamaguchi , Imagama S

STUDY DESIGN: Prospective cohort study. PURPOSE: To identify factors that affect sagittal alignment correction in lateral lumbar interbody fusion (LIF) surgery for adult spinal deformity (ASD) and to investigate the degree...
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Unplanned Second-Stage Decompression for Neurological Deterioration Caused by Central Canal Stenosis after Indirect Lumbar Decompression Surgery

Nakashima , Kanemura T, Satake K, Ishikawa Y, Ouchida J, Segi N, Yamaguchi , Imagama S

STUDY DESIGN: Prospective cohort study. PURPOSE: This study aimed to identify risk factors for unplanned second-stage decompression for postoperative neurological deficit after indirect decompression using lateral lumbar interbody fusion (LLIF) with...
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Changes in Sagittal Alignment Following Short-Level Lumbar Interbody Fusion: Comparison between Posterior and Lateral Lumbar Interbody Fusions

Nakashima , Kanemura T, Satake K, Ishikawa Y, Ouchida J, Segi N, Yamaguchi , Imagama S

STUDY DESIGN: Retrospective case-control study. PURPOSE: We aimed to compare radiologic outcomes between posterior (PLIF) and lateral lumbar interbody fusion (LLIF) in short-level spinal fusion surgeries. OVERVIEW OF LITERATURE: Although LLIF enables...
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Postoperative Severe Headache Following Cervical Posterior Surgical Fixation from C2 Distally

Tauchi R, Lee SH, Kim JY, Kim YC, Peters C, Imagama S, Ishiguro N, Buchowski , Riew KD

STUDY DESIGN: Retrospective study. PURPOSE: To identify the prevalence of severe headache occurring after cervical posterior surgical fixation (PSF) and to evaluate the clinical and radiological findings associated with severe headache...
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