Publications by authors named "Junhoe Kim"

Lumbar foraminal stenosis can be surgically treated by foraminal decompression or facet joint resection and fusion (transforaminal lumbar interbody fusion, TLIF). While conventional foraminal decompression poses a risk of segmental instability, the endoscopic approach (extended endoscopic lumbar foraminotomy, EELF) resects only the ventral part of the facet joint with a horizontal surgical trajectory. A prospective observational study was performed to analyze the cost-effectiveness of EELF versus TLIF.

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The efficacy of preoperative radiotherapy combined with surgery (preRT + S) for primary retroperitoneal sarcoma (RPS) remains unclear. This study aimed to compare preRT + S with surgery alone (SA) in patients with RPS. Core databases were searched for directly comparative studies depending on preRT.

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Oblique lumbar interbody fusion (OLIF) is a minimally invasive lateral lumbar fusion technique and patients are discharged 1-2 days after surgery. Because OLIF utilizes a retroperitoneal approach close to the superior hypogastric plexus, postoperative urinary retention (POUR) may not be an uncommon problem. The purpose of this study was to present the incidence and outcomes of POUR with a systematic care protocol.

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Objective: Classification guides the surgical approach and predicts prognosis. However, existing classifications of spinal schwannomas often result in a high 'unclassified' rate. Here, we aim to develop a new comprehensive classification for spinal schwannomas based on their presumed origin.

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Article Synopsis
  • Patients after cervical laminoplasty may not need regular follow-ups if their symptoms improve significantly; this study aimed to use machine learning to predict long-term outcomes at the 2-year mark based on initial postoperative results.
  • A total of 80 patients’ progress was tracked using Japanese Orthopedic Association (JOA) scores over the first year, and eight machine learning algorithms were developed, with the LSTM algorithm showing the highest accuracy in predicting which patients would achieve a satisfactory symptom state (PASS) by 24 months.
  • Despite a small patient sample, the findings suggest that past outcomes can inform future predictions, potentially helping optimize follow-up schedules and allocate medical resources more efficiently.
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Background Context: Numerous prognostic models are utilized for surgical decision and prognostication in metastatic spine tumors. However, these models often fail to consider the whole-body tumor burden into account, which may be crucial for the prognosis of metastatic cancers. A potential surrogate marker for tumor burden, whole-body metabolic tumor burden (wMTB), can be calculated from total lesion glycolysis (TLG) obtained from F-Fludeoxyglucose positive emission tomography (F-FDG PET) images.

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  • The study evaluated the effectiveness of the Erector Spinae Plane Block (ESPB) for improving postoperative quality of recovery (QoR) in patients undergoing transforaminal lumbar interbody fusion (TLIF) or oblique lumbar interbody fusion (OLIF).
  • Patients were divided into two groups: one receiving ESPB and the other as a control, with QoR measured before surgery and on days 1 and 3 after surgery.
  • Results showed no significant difference in QoR-15 scores between the groups, but the ESPB group reported lower pain scores during ambulation and ambulated sooner after surgery, indicating some benefits in pain management rather than overall recovery quality.
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Dual-position oblique lumbar interbody fusion with fluoroscopy (D-OLIF) requires repositioning the patient to a prone position for pedicle screw insertion. Recently, single-position surgery with navigation has been introduced. However, there are concerns regarding pedicle screw accuracy and achieving appropriate sagittal balance in single-position OLIF with navigation (S-OLIF).

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Article Synopsis
  • * Analyzed data from 43 patients showed that IOUS effectively confirmed tumor locations, aided in minimizing neural injury, and helped identify hidden lesions, leading to better surgical outcomes.
  • * The findings suggest that IOUS is a beneficial tool in spinal surgeries, as it improves the accuracy of tumor removal and reduces the risk of complications.
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Background And Objectives: In cases where dumbbell-shaped cervical schwannoma encases the vertebral artery (VA), there is a risk of VA injury during surgery. The objective of this study is to propose a strategy for preserving the VA during the surgical excision of tumors adjacent to the VA through the utilization of anatomic layers.

Methods: A retrospective analysis was conducted on 37 patients who underwent surgery for dumbbell-shaped cervical schwannoma with contacting VA from January 2004 to July 2023.

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  • The study examined trends in degenerative lumbar spinal surgeries in South Korea during the first year of the COVID-19 pandemic, focusing on three epidemic waves in 2020.
  • Surgeries decreased after the first two waves, but patient numbers rebounded in later months, with the third wave not impacting surgical volumes.
  • Despite a reduction in average length of hospital stay and a rise in costs, the study found decreased transfer and readmission rates, suggesting that surgical care adapted well during the pandemic.
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  • Lumbar spinal stenosis (LSS) and spondylolisthesis (SPL) are similar degenerative spinal conditions that have different recommendations regarding exercise, making it challenging to study the impact of physical activity on them.
  • This study examined the effects of restricted physical activity due to social distancing during the pandemic on healthcare visits and costs for patients with LSS and SPL, comparing data from the pandemic period to pre-pandemic.
  • Results showed a significant decrease in hospital visits for both LSS and SPL patients after the implementation of social distancing, with LSS patients also experiencing a notable reduction in medical costs, while SPL patients did not see a significant change in costs.
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Article Synopsis
  • * Using data from the National Health Insurance Service-National Sample Cohort in South Korea, 3,881 patients who underwent surgery for various lumbar spine conditions were analyzed.
  • * Results showed that patients who had secondary surgery incurred higher costs, both for surgery ($1,829.59 vs. $1,618.40) and interim expenses, indicating that tracking these costs can help identify patients who may need further procedures.
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Although the role of plain radiographs in diagnosing lumbar spinal stenosis (LSS) has declined in importance since the advent of magnetic resonance imaging (MRI), diagnostic ability of plain radiographs has improved dramatically when combined with deep learning. Previously, we developed a convolutional neural network (CNN) model using a radiograph for diagnosing LSS. In this study, we aimed to improve and generalize the performance of CNN models and overcome the limitation of the single-pose-based CNN (SP-CNN) model using multi-pose radiographs.

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Article Synopsis
  • The study investigates the effectiveness of the comprehensive Enhanced Recovery After Surgery (ERAS) protocol on spine surgery patients, focusing on both primary spine tumors (PSTs) and degenerative spinal diseases (DSDs).
  • Through a retrospective analysis of 7143 surgical procedures performed at a hospital from 2003 to 2021, the study compares outcomes before and after the full implementation of the ERAS protocol.
  • Results indicate that the ERAS protocol significantly reduced the length of hospital stay and medical costs by 22% overall, with a more notable 28% reduction in the PST group compared to a 16% reduction in the DSD group.
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Although resection is the gold standard treatment for spinal ependymoma, permanent neurological deterioration has been reported postoperatively in 20%-27% of patients. Despite thorough dissection of the tumor from its surroundings, conventional longitudinally directed midline myelotomy can lead to injury to the dorsal column, possibly due to deformation of the posterior median septum as the tumor grows. To address this issue, the authors have been performing precise midline myelotomy through the anatomical posterior median septum by directly dissecting the dorsal column.

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Background And Objectives: Oblique lumbar interbody fusion (OLIF) procedures involve anterior insertion of interbody cage in lateral position. Following OLIF, insertion of pedicle screws and rod system is performed in a prone position (OLIF-con). The location of the cage is important for restoration of lumbar lordosis and indirect decompression.

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Background Context: C3 laminectomy in cervical laminoplasty is a modified laminoplasty technique that can preserve the semispinalis cervicis muscle attached to the C2 spinous process. Several previous studies have shown that this technique can lead to better outcomes of postoperative axial neck pain and C2-C3 range of motion (ROM) than conventional cervical laminoplasty. However, there is still a lack of understanding of total and proportional postoperative cervical sagittal alignment outcomes.

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Purpose: Spinal schwannomas often require laminectomy for gross total resection. However, laminectomy may not be necessary due to the unique anatomy of epidural schwannomas at the C1-2 level, even with the intradural part. This study aimed to determine the need for laminectomy by comparing factors between patients who underwent laminectomy and those who did not and to identify the benefits of not performing laminectomy.

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Surgical outcomes of degenerative cervical spinal disease are dependent on the selection of surgical techniques. Although a standardized decision cannot be made in an actual clinical setting, continued education is provided to standardize the medical practice among surgeons. Therefore, it is necessary to supervise and regularly update overall surgical outcomes.

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We conceptually designed a robust nano-scale waveguide structure suitable for potential use as a spin-wave duplexer that allows signal propagation only of selected narrow-band frequencies and duplex transmission in a three-port device comprising a receiver, a transmitter, and their common antenna. The waveguide structure combines three different arms and a circular ring, both made of nanostrip waveguides and a single magnetic material for reliably controllable propagations of spin waves. We attribute the observed duplex transmission of spin waves of narrow pass bands to scattering of spin waves by edge solitons placed at contact areas between the arms and the circular ring.

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Introduction: Intracranial neurenteric cysts are rare and are not often found in the supratentorial space. We present a case of an intracranial neurenteric cyst that arose at the suprasellar cistern with extension to the middle cranial fossa.

History: A 3-year-old girl presented with seizure.

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We experimentally demonstrate strongly enhanced coupling between excited magnons in an Yttrium Iron Garnet (YIG) film and microwave photons in an inverted pattern of split-ring resonator (noted as ISRR). The anti-crossing effects of the ISRR's photon mode and the YIG's magnon modes were found from |S|-versus-frequency measurements for different strengths and directions of externally applied magnetic fields. The spin-number-normalized coupling strength (i.

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We report on a micromagnetic numerical simulation study of dynamic coupling between neighboring skyrmions periodically arranged in narrow-width nanostrips. We explored the coupled gyration modes and their characteristic dispersions in terms of the interdistance between the neighboring skyrmions. The application of perpendicular magnetic fields allows for the control and modification of the dispersion of the coupled gyration modes.

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