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Posterior Endoscopic Cervical Decompression: Review and Technical Note
Chao Zhang,Junlong Wu,Wenjie Zheng,Changing Li,Yue Zhou 대한척추신경외과학회 2020 Neurospine Vol.17 No.sup.
Endoscopic spine surgery for the treatment of degenerative spinal diseases from lumbar to cervical spine has accelerated over the past 2 decades. Posterior endoscopic cervical discectomy (PECD) has been described as a safe, effective, and minimally invasive procedure for cervical radiculopathy or even part of the myelopathy. This procedure also has been validated with comparable outcomes to open and microscopic surgery. Radiculopathy due to foraminal disc herniation or foraminal stenosis should be the optimum indications of this procedure. Intraoperative 3-dimensional navigation can help surgeons to get quick and great quality guidance for endoscopic surgeons. In this review, we will focus on the technical details and evidence-based results of PECD which is a promising procedure for cervical radiculopathy with the advantages of a minimally invasive method.
Xingwei Xue,Meizhong Wu,Peng Zhou,Junlong Zhou 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
External vertical prestressing rebars (EVPRs) can effectively improve shear strength of concrete structures by the way of providing vertical compressive stress to the concrete and acting as stirrups. The objective of this study is to obtain a shear strength prediction model of EVPRs strengthening concrete beam without transverse reinforcement enhanced by modifying the ACI-318 and Critical Shear Crack Theory (CSCT). At the same time, this article analyzes the contribution of the strength of the shear strength, including the EVPRs as stirrups, compression zone of concrete, dowelling action, aggregate interlock and residual tensile strength. The results indicate that the shear strength prediction model can fit well with the experimental data and EVPRs can effectively enhance shear strength.