Sejoon Park

Background: The failure modes, time to development, and clinical relevance are known to differ between proximal junctional kyphosis (PJK) and proximal junctional failure (PJF). However, there are no reports that study the risk factors of PJK and PJF separately. Objective: The aim of this study was to investigate the risk factors for PJK and PJF separately. Methods: A retrospective study of 160 consecutive patients who underwent a long instrumented fusion to the sacrum for adult spinal deformity

STUDY DESIGN: A prospective radiographic analysis. OBJECTIVE: To assess the ideal cage position for lateral lumbar interbody fusion (LLIF) together. SUMMARY OF BACKGROUND DATA: Achieving both indirect decompression and restoration of the segmental angle (SA) appear to be contrary to one another because the anteriorly located cage might be advantageous for restoring the SA, and posteriorly located cage might be favorable for achieving the indirect decompression effect. Little has been known about

STUDY DESIGN: Retrospective study. OBJECTIVE: The aim of this study was to investigate the risk factors for proximal junctional failure (PJF) following long instrumented fusion stopping at thoracolumbar junction (TLJ) in adult spinal deformity (ASD) and to determine which cases are suitable for TLJ stop without increasing the risk for PJF. SUMMARY OF BACKGROUND DATA: PJF following long fusion for ASD is a well-recognized complication that negatively affects clinical outcomes. Generally, the uppe

Prognostic Level II. See the guidelines for authors for a complete description of levels of evidence.

STUDY DESIGN: Retrospective study. OBJECTIVE: To validate the age-adjusted ideal sagittal alignment in terms of proximal junctional failure (PJF) and clinical outcomes. SUMMARY OF BACKGROUND: It is reported that optimal sagittal correction with regard to the age-adjusted ideal sagittal alignment reduces the risk of PJF development. However, few studies have validated this concept. The age-considered optimal correction is likely to be undercorrection in terms of conventional surgical target, such

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Osteoporotic vertebral compression fractures (OVCF) can cause severe pain, changes in balance, gait velocity, muscle fatigue, risk of falls, and subsequent fractures. Thus, OVCF significantly lowers the individual's health-related quality of life. Additionally, OVCF may increase patient mortality rates. However, studies on post-OVCF mortality are limited. This study aimed to evaluate mortality risk after the first occurrence of OVCF in the general population using a nationwide dataset from the K

BACKGROUND: Four guidelines have been suggested for optimal correction in adult spinal deformity surgery: Scoliosis Research Society (SRS)-Schwab classification, age-adjusted sagittal alignment goals, Global Alignment and Proportion (GAP) score, and the Roussouly algorithm. Whether these goals provide benefit in both proximal junctional kyphosis (PJK) reduction and clinical outcome improvement remains unclear. OBJECTIVE: To validate 4 preoperative surgical planning tools in PJK development and c

BACKGROUND: Rigid internal fixation of the spine is an essential part of adult spinal deformity (ASD) surgery. Despite the use of pelvic fixation and anterior column support, spinopelvic fixation failure (SPFF) still remains an issue. Few studies have evaluated the types of such failure or its related factors. OBJECTIVE: To classify the types of SPFF and investigate its risk factors, including the fusion status at L5-S1 on CT scan. METHODS: The study cohort consisted of ninety-eight ASD patients

STUDY DESIGN: Retrospective study. OBJECTIVE: The aim of this study was to investigate the long-term fate of asymptomatic PJK focusing on the elderly patients with sagittal imbalance by comparing the patients with and without PJK. SUMMARY OF BACKGROUND DATA: Most of previous studies demonstrated that PJK does not negatively affect the clinical outcome compared to that of the patients without PJK. The question "will the asymptomatic PJK remain asymptomatic even in long-term follow-up?" has not be

STUDY DESIGN: Retrospective study. OBJECTIVE: To identify the risk factors for revision surgery among neurologically intact patients with proximal junctional failure (PJF) after adult spinal deformity (ASD) surgery. SUMMARY OF BACKGROUND DATA: PJF following long fusion for ASD is a well-recognized complication that negatively affects clinical outcomes. However, revision surgery is not required for every patient with PJF especially if the patient does not present with neurologic deficit. Identify

OBJECTIVE: The goal of this study was to evaluate the radiographic and clinical results of instrumentation surgery without fusion for metastases to the spine. METHODS: Between 2010 and 2017, patients with spinal tumors who underwent instrumentation without fusion surgery were consecutively evaluated. Preoperative and postoperative clinical data were evaluated. Data were inclusive for last follow-up and just prior to death if the patient died. Instrumentation-related complications included screw