{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T01:51:26Z","timestamp":1789696286772,"version":"4.0.1"},"reference-count":48,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,8,1]]},"abstract":"<jats:sec>\n                    <jats:title>OBJECTIVE<\/jats:title>\n                    <jats:p>This case series introduces a modified biportal endoscopic technique for treating multilevel cervical spondylotic myelopathy (CSM) and evaluates midterm clinical and radiological outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS<\/jats:title>\n                    <jats:p>Biportal endoscopic decompression laminectomy using the spinous process floating technique was performed on patients with multilevel CSM. Radiographic measurements, including the C2\u20137 Cobb angle, range of motion, and cross-sectional area (CSA) of the dural sac and extensor muscles, were assessed preoperatively and 1-year postoperatively. Clinical outcomes were analyzed using the visual analog scale (VAS) and Japanese Orthopaedic Association (JOA) scale scores, with detailed complications documented.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>Ten patients with 26 spinal segments underwent this surgery. The mean VAS and JOA scale scores showed significant improvement at the final follow-up: VAS neck score 6.0 \u00b1 1.0 to 3.2 \u00b1 0.4, VAS arm pain score 7.7 \u00b1 0.6 to 2.4 \u00b1 0.7, and JOA score 12.3 \u00b1 0.6 to 15.5 \u00b1 0.5 (all p &lt; 0.05). The mean C2\u20137 Cobb angle gradually decreased after surgery but this increase was not statistically significant (9.9\u00b0 \u00b1 7.7\u00b0 preoperatively, 7.4\u00b0 \u00b1 8.7\u00b0 at 1 year, and 7.0\u00b0 \u00b1 8.6\u00b0 at final follow-up). The reduction in the CSA of neck extensor muscles was minimal (12.9% \u00b1 9.9% reduction at 1 year). The dural sac CSA expansion was sustained at 1 year (54.6% \u00b1 36.6% increase). Delayed stress fractures of the spinous process occurred in 3-segment operations.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSIONS<\/jats:title>\n                    <jats:p>Biportal endoscopic posterior cervical laminectomy for multilevel CSM was performed successfully without serious complications. Biportal endoscopic cervical laminoplasty significantly expanded the central canal in patients with CSM and provided favorable clinical outcomes after surgery. This technique offers a minimally invasive alternative to traditional surgery.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3171\/2025.2.spine241142","type":"journal-article","created":{"date-parts":[[2025,5,30]],"date-time":"2025-05-30T22:18:31Z","timestamp":1748643511000},"page":"181-189","source":"Crossref","is-referenced-by-count":9,"title":["Biportal endoscopic multisegment decompression laminectomy for cervical spondylotic myelopathy"],"prefix":"10.3171","volume":"43","author":[{"given":"Ji Yeon","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Spine Center, Seran General Hospital, Seoul;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong Hwa","family":"Heo","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Chungdam Harrison Spinartus Hospital, Chungdam, Seoul; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Su Yong","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Spine Center, Seran General Hospital, Seoul;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong Chan","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Spine Center, Wiltse Memorial Hospital, Anyang, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hee Chang","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Spine Center, Wiltse Memorial Hospital, Anyang, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"issue":"5","key":"b1","series-title":"Spine (Phila Pa 1976)","first-page":"E286","article-title":"New techniques for exposure of posterior cervical spine through intermuscular planes and their surgical application","volume":"37","author":"Shiraishi T","year":"2012","unstructured":"Shiraishi T, Kato M, Yato Y,  New techniques for exposure of posterior cervical spine through intermuscular planes and their surgical application. Spine (Phila Pa 1976). 2012;37(5):E286\u2013E296."},{"key":"b2","series-title":"World Neurosurg","first-page":"e412","article-title":"Posterior cervical muscle-preserving interspinous process approach and decompression: more minimally invasive and modified Shiraishi\u2019s selective laminectomy","volume":"133","author":"Lee BJ","year":"2020","unstructured":"Lee BJ, Park JH, Jeon SR, Roh SW, Rhim SC, Jung SK. Posterior cervical muscle-preserving interspinous process approach and decompression: more minimally invasive and modified Shiraishi\u2019s selective laminectomy. World Neurosurg. 2020;133:e412\u2013e420."},{"issue":"suppl 19","key":"b3","series-title":"Spine (Phila Pa 1976)","first-page":"B44","article-title":"Cervical endoscopic laminoplasty for cervical myelopathy","volume":"41","author":"Zhang C","year":"2016","unstructured":"Zhang C, Li D, Wang C, Yan X. Cervical endoscopic laminoplasty for cervical myelopathy. Spine (Phila Pa 1976). 2016;41(suppl 19):B44-B51."},{"key":"b4","series-title":"World Neurosurg","first-page":"e273","article-title":"Safe route for cervical approach: partial pediculotomy, partial vertebrotomy approach for posterior endoscopic cervical foraminotomy and discectomy","volume":"140","author":"Kim HS","year":"2020","unstructured":"Kim HS, Wu PH, Lee YJ,  Safe route for cervical approach: partial pediculotomy, partial vertebrotomy approach for posterior endoscopic cervical foraminotomy and discectomy. World Neurosurg. 2020;140:e273\u2013e282."},{"issue":"1","key":"b5","series-title":"Neurospine","first-page":"139","article-title":"Anatomical importance between neural structure and bony landmark: clinical importance for posterior endoscopic cervical foraminotomy","volume":"18","author":"Kim JY","year":"2021","unstructured":"Kim JY, Kim DH, Lee YJ,  Anatomical importance between neural structure and bony landmark: clinical importance for posterior endoscopic cervical foraminotomy. Neurospine. 2021;18(1):139\u2013146."},{"issue":"1","key":"b6","series-title":"Neurospine","first-page":"212","article-title":"Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes","volume":"19","author":"Kim JY","year":"2022","unstructured":"Kim JY, Hong HJ, Lee DC, Kim TH, Hwang JS, Park CK. Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes. Neurospine. 2022;19(1):212\u2013223."},{"issue":"2","key":"b7","series-title":"J Spine Surg","first-page":"383","article-title":"Full endoscopic cervical spine surgery","volume":"6","author":"Shen J","year":"2020","unstructured":"Shen J, Telfeian AE, Shaaya E, Oyelese A, Fridley J, Gokaslan ZL. Full endoscopic cervical spine surgery. J Spine Surg. 2020;6(2):383\u2013390."},{"issue":"1)(suppl 1","key":"b8","series-title":"Neurospine","first-page":"S145","article-title":"The biportal endoscopic posterior cervical inclinatory foraminotomy for cervical radiculopathy: technical report and preliminary results","volume":"17","author":"Song KS","year":"2020","unstructured":"Song KS, Lee CW. The biportal endoscopic posterior cervical inclinatory foraminotomy for cervical radiculopathy: technical report and preliminary results. Neurospine. 2020;17(1)(suppl 1):S145\u2013S153."},{"issue":"2","key":"b9","series-title":"J Spine Surg","first-page":"447","article-title":"Full endoscopic unilateral laminotomy for bilateral decompression of the cervical spine: surgical technique and early experience","volume":"6","author":"Carr DA","year":"2020","unstructured":"Carr DA, Abecassis IJ, Hofstetter CP. Full endoscopic unilateral laminotomy for bilateral decompression of the cervical spine: surgical technique and early experience. J Spine Surg. 2020;6(2):447\u2013456."},{"issue":"1","key":"b10","series-title":"Neurospine","first-page":"92","article-title":"Biportal endoscopic posterior cervical foraminotomy for adjacent 2-level foraminal lesions using a single approach (sliding technique)","volume":"20","author":"Heo DH","year":"2023","unstructured":"Heo DH, Ha JS, Jang JW. Biportal endoscopic posterior cervical foraminotomy for adjacent 2-level foraminal lesions using a single approach (sliding technique). Neurospine. 2023;20(1):92\u201398."},{"issue":"9","key":"b11","series-title":"Acta Neurochir (Wien)","first-page":"2537","article-title":"Biportal endoscopic unilateral laminotomy with bilateral decompression for the treatment of cervical spondylotic myelopathy","volume":"163","author":"Kim J","year":"2021","unstructured":"Kim J, Heo DH, Lee DC, Chung HT. Biportal endoscopic unilateral laminotomy with bilateral decompression for the treatment of cervical spondylotic myelopathy. Acta Neurochir (Wien). 2021;163(9):2537\u20132543."},{"key":"b12","series-title":"World Neurosurg","first-page":"31","article-title":"Endoscopic unilateral laminotomy with bilateral discectomy using biportal endoscopic approach: technical report and preliminary clinical results","volume":"137","author":"Heo DH","year":"2020","unstructured":"Heo DH, Lee N, Park CW, Kim HS, Chung HJ. Endoscopic unilateral laminotomy with bilateral discectomy using biportal endoscopic approach: technical report and preliminary clinical results. World Neurosurg. 2020;137:31\u201337."},{"issue":"8","key":"b13","series-title":"Eur Spine J","first-page":"2853","article-title":"Enhanced recovery after surgery pathway with modified biportal endoscopic transforaminal lumbar interbody fusion using a large cage. Comparative study with minimally invasive microscopic transforaminal lumbar interbody fusion","volume":"32","author":"Heo DH","year":"2023","unstructured":"Heo DH, Jang JW, Park CK. Enhanced recovery after surgery pathway with modified biportal endoscopic transforaminal lumbar interbody fusion using a large cage. Comparative study with minimally invasive microscopic transforaminal lumbar interbody fusion. Eur Spine J. 2023;32(8):2853\u20132862."},{"issue":"6","key":"b14","series-title":"J Clin Med","first-page":"2119","article-title":"Preoperative decreased Hounsfield unit values of cervical vertebrae and the relative cross-sectional area of flexion\/extension paraspinal muscles are novel risk factors for the loss of cervical lordosis after open-door laminoplasty","volume":"12","author":"Hu W","year":"2023","unstructured":"Hu W, Li S, Shi H,  Preoperative decreased Hounsfield unit values of cervical vertebrae and the relative cross-sectional area of flexion\/extension paraspinal muscles are novel risk factors for the loss of cervical lordosis after open-door laminoplasty. J Clin Med. 2023;12(6):2119."},{"issue":"47","key":"b15","series-title":"Medicine (Baltimore)","first-page":"e13335","article-title":"The time course of cervical alignment after cervical expansive laminoplasty: Determining optimal cut-off preoperative angle for predicting postoperative kyphosis","volume":"97","author":"Choi I","year":"2018","unstructured":"Choi I, Roh SW, Rhim SC, Jeon SR. The time course of cervical alignment after cervical expansive laminoplasty: Determining optimal cut-off preoperative angle for predicting postoperative kyphosis. Medicine (Baltimore). 2018;97(47):e13335."},{"issue":"1","key":"b16","series-title":"Global Spine J","first-page":"31","article-title":"Changes in cervical sagittal alignment after single-level posterior percutaneous endoscopic cervical diskectomy","volume":"5","author":"Kim CH","year":"2015","unstructured":"Kim CH, Shin KH, Chung CK, Park SB, Kim JH. Changes in cervical sagittal alignment after single-level posterior percutaneous endoscopic cervical diskectomy. Global Spine J. 2015;5(1):31\u201338."},{"issue":"1","key":"b17","series-title":"J Neurosurg Spine","first-page":"8","article-title":"Gap between flexion and extension ranges of motion: a novel indicator to predict the loss of cervical lordosis after laminoplasty in patients with cervical spondylotic myelopathy","volume":"35","author":"Fujishiro T","year":"2021","unstructured":"Fujishiro T, Hayama S, Obo T,  Gap between flexion and extension ranges of motion: a novel indicator to predict the loss of cervical lordosis after laminoplasty in patients with cervical spondylotic myelopathy. J Neurosurg Spine. 2021;35(1):8\u201317."},{"issue":"3","key":"b18","series-title":"Neurospine","first-page":"603","article-title":"Comparative analysis with modified inclined technique for posterior endoscopic cervical foraminotomy in treating cervical osseous foraminal stenosis: radiological and midterm clinical outcomes","volume":"19","author":"Kim JY","year":"2022","unstructured":"Kim JY, Heo DH, Lee DC, Kim TH, Park CK. Comparative analysis with modified inclined technique for posterior endoscopic cervical foraminotomy in treating cervical osseous foraminal stenosis: radiological and midterm clinical outcomes. Neurospine. 2022;19(3):603\u2013615."},{"issue":"1","key":"b19","series-title":"Neurospine","first-page":"212","article-title":"Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes","volume":"19","author":"Kim JY","year":"2022","unstructured":"Kim JY, Hong HJ, Lee DC, Kim TH, Hwang JS, Park CK. Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes. Neurospine. 2022;19(1):212\u2013223."},{"key":"b20","series-title":"World Neurosurg","first-page":"228","article-title":"Surgical removal of cervical extradural cysts using the biportal endoscopic approach","volume":"164","author":"Kim J","year":"2022","unstructured":"Kim J, Heo DH, Lee DC, Park CK, Chung H. Surgical removal of cervical extradural cysts using the biportal endoscopic approach. World Neurosurg. 2022;164:228\u2013236."},{"issue":"1","key":"b21","series-title":"Neurospine","first-page":"129","article-title":"Biportal endoscopic posterior thoracic laminectomy for thoracic spondylotic myelopathy caused by ossification of the ligamentum flavum: technical developments and outcomes","volume":"20","author":"Kim JY","year":"2023","unstructured":"Kim JY, Ha JS, Lee CK,  Biportal endoscopic posterior thoracic laminectomy for thoracic spondylotic myelopathy caused by ossification of the ligamentum flavum: technical developments and outcomes. Neurospine. 2023;20(1):129\u2013140."},{"key":"b22","series-title":"World Neurosurg","first-page":"e836","article-title":"Water dynamics in unilateral biportal endoscopic spine surgery and its related factors: an in vivo proportional regression and proficiency-matched study","volume":"149","author":"Hong YH","year":"2021","unstructured":"Hong YH, Kim SK, Hwang J,  Water dynamics in unilateral biportal endoscopic spine surgery and its related factors: an in vivo proportional regression and proficiency-matched study. World Neurosurg. 2021;149:e836\u2013e843."},{"issue":"1","key":"b23","series-title":"Acta Neurochir (Wien)","first-page":"182","article-title":"Biportal endoscopic cervical open-door laminoplasty to treat cervical spondylotic myelopathy","volume":"166","author":"Kim JY","year":"2024","unstructured":"Kim JY, Heo DH. Biportal endoscopic cervical open-door laminoplasty to treat cervical spondylotic myelopathy. Acta Neurochir (Wien). 2024;166(1):182."},{"key":"b24","series-title":"Front Surg","first-page":"913456","article-title":"Case report: Bilateral biportal endoscopic open-door laminoplasty with the use of suture anchors: a technical report and literature review","volume":"9","author":"Zhu C","year":"2022","unstructured":"Zhu C, Wang J, Cheng W, Wang D, Pan H, Zhang W. Case report: Bilateral biportal endoscopic open-door laminoplasty with the use of suture anchors: a technical report and literature review. Front Surg. 2022;9:913456."},{"issue":"5","key":"b1","series-title":"Spine (Phila Pa 1976)","first-page":"E286","article-title":"New techniques for exposure of posterior cervical spine through intermuscular planes and their surgical application","volume":"37","author":"Shiraishi T","year":"2012","unstructured":"Shiraishi T, Kato M, Yato Y,  New techniques for exposure of posterior cervical spine through intermuscular planes and their surgical application. Spine (Phila Pa 1976). 2012;37(5):E286\u2013E296."},{"key":"b2","series-title":"World Neurosurg","first-page":"e412","article-title":"Posterior cervical muscle-preserving interspinous process approach and decompression: more minimally invasive and modified Shiraishi\u2019s selective laminectomy","volume":"133","author":"Lee BJ","year":"2020","unstructured":"Lee BJ, Park JH, Jeon SR, Roh SW, Rhim SC, Jung SK. Posterior cervical muscle-preserving interspinous process approach and decompression: more minimally invasive and modified Shiraishi\u2019s selective laminectomy. World Neurosurg. 2020;133:e412\u2013e420."},{"issue":"suppl 19","key":"b3","series-title":"Spine (Phila Pa 1976)","first-page":"B44","article-title":"Cervical endoscopic laminoplasty for cervical myelopathy","volume":"41","author":"Zhang C","year":"2016","unstructured":"Zhang C, Li D, Wang C, Yan X. Cervical endoscopic laminoplasty for cervical myelopathy. Spine (Phila Pa 1976). 2016;41(suppl 19):B44-B51."},{"key":"b4","series-title":"World Neurosurg","first-page":"e273","article-title":"Safe route for cervical approach: partial pediculotomy, partial vertebrotomy approach for posterior endoscopic cervical foraminotomy and discectomy","volume":"140","author":"Kim HS","year":"2020","unstructured":"Kim HS, Wu PH, Lee YJ,  Safe route for cervical approach: partial pediculotomy, partial vertebrotomy approach for posterior endoscopic cervical foraminotomy and discectomy. World Neurosurg. 2020;140:e273\u2013e282."},{"issue":"1","key":"b5","series-title":"Neurospine","first-page":"139","article-title":"Anatomical importance between neural structure and bony landmark: clinical importance for posterior endoscopic cervical foraminotomy","volume":"18","author":"Kim JY","year":"2021","unstructured":"Kim JY, Kim DH, Lee YJ,  Anatomical importance between neural structure and bony landmark: clinical importance for posterior endoscopic cervical foraminotomy. Neurospine. 2021;18(1):139\u2013146."},{"issue":"1","key":"b6","series-title":"Neurospine","first-page":"212","article-title":"Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes","volume":"19","author":"Kim JY","year":"2022","unstructured":"Kim JY, Hong HJ, Lee DC, Kim TH, Hwang JS, Park CK. Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes. Neurospine. 2022;19(1):212\u2013223."},{"issue":"2","key":"b7","series-title":"J Spine Surg","first-page":"383","article-title":"Full endoscopic cervical spine surgery","volume":"6","author":"Shen J","year":"2020","unstructured":"Shen J, Telfeian AE, Shaaya E, Oyelese A, Fridley J, Gokaslan ZL. Full endoscopic cervical spine surgery. J Spine Surg. 2020;6(2):383\u2013390."},{"issue":"1)(suppl 1","key":"b8","series-title":"Neurospine","first-page":"S145","article-title":"The biportal endoscopic posterior cervical inclinatory foraminotomy for cervical radiculopathy: technical report and preliminary results","volume":"17","author":"Song KS","year":"2020","unstructured":"Song KS, Lee CW. The biportal endoscopic posterior cervical inclinatory foraminotomy for cervical radiculopathy: technical report and preliminary results. Neurospine. 2020;17(1)(suppl 1):S145\u2013S153."},{"issue":"2","key":"b9","series-title":"J Spine Surg","first-page":"447","article-title":"Full endoscopic unilateral laminotomy for bilateral decompression of the cervical spine: surgical technique and early experience","volume":"6","author":"Carr DA","year":"2020","unstructured":"Carr DA, Abecassis IJ, Hofstetter CP. Full endoscopic unilateral laminotomy for bilateral decompression of the cervical spine: surgical technique and early experience. J Spine Surg. 2020;6(2):447\u2013456."},{"issue":"1","key":"b10","series-title":"Neurospine","first-page":"92","article-title":"Biportal endoscopic posterior cervical foraminotomy for adjacent 2-level foraminal lesions using a single approach (sliding technique)","volume":"20","author":"Heo DH","year":"2023","unstructured":"Heo DH, Ha JS, Jang JW. Biportal endoscopic posterior cervical foraminotomy for adjacent 2-level foraminal lesions using a single approach (sliding technique). Neurospine. 2023;20(1):92\u201398."},{"issue":"9","key":"b11","series-title":"Acta Neurochir (Wien)","first-page":"2537","article-title":"Biportal endoscopic unilateral laminotomy with bilateral decompression for the treatment of cervical spondylotic myelopathy","volume":"163","author":"Kim J","year":"2021","unstructured":"Kim J, Heo DH, Lee DC, Chung HT. Biportal endoscopic unilateral laminotomy with bilateral decompression for the treatment of cervical spondylotic myelopathy. Acta Neurochir (Wien). 2021;163(9):2537\u20132543."},{"key":"b12","series-title":"World Neurosurg","first-page":"31","article-title":"Endoscopic unilateral laminotomy with bilateral discectomy using biportal endoscopic approach: technical report and preliminary clinical results","volume":"137","author":"Heo DH","year":"2020","unstructured":"Heo DH, Lee N, Park CW, Kim HS, Chung HJ. Endoscopic unilateral laminotomy with bilateral discectomy using biportal endoscopic approach: technical report and preliminary clinical results. World Neurosurg. 2020;137:31\u201337."},{"issue":"8","key":"b13","series-title":"Eur Spine J","first-page":"2853","article-title":"Enhanced recovery after surgery pathway with modified biportal endoscopic transforaminal lumbar interbody fusion using a large cage. Comparative study with minimally invasive microscopic transforaminal lumbar interbody fusion","volume":"32","author":"Heo DH","year":"2023","unstructured":"Heo DH, Jang JW, Park CK. Enhanced recovery after surgery pathway with modified biportal endoscopic transforaminal lumbar interbody fusion using a large cage. Comparative study with minimally invasive microscopic transforaminal lumbar interbody fusion. Eur Spine J. 2023;32(8):2853\u20132862."},{"issue":"6","key":"b14","series-title":"J Clin Med","first-page":"2119","article-title":"Preoperative decreased Hounsfield unit values of cervical vertebrae and the relative cross-sectional area of flexion\/extension paraspinal muscles are novel risk factors for the loss of cervical lordosis after open-door laminoplasty","volume":"12","author":"Hu W","year":"2023","unstructured":"Hu W, Li S, Shi H,  Preoperative decreased Hounsfield unit values of cervical vertebrae and the relative cross-sectional area of flexion\/extension paraspinal muscles are novel risk factors for the loss of cervical lordosis after open-door laminoplasty. J Clin Med. 2023;12(6):2119."},{"issue":"47","key":"b15","series-title":"Medicine (Baltimore)","first-page":"e13335","article-title":"The time course of cervical alignment after cervical expansive laminoplasty: Determining optimal cut-off preoperative angle for predicting postoperative kyphosis","volume":"97","author":"Choi I","year":"2018","unstructured":"Choi I, Roh SW, Rhim SC, Jeon SR. The time course of cervical alignment after cervical expansive laminoplasty: Determining optimal cut-off preoperative angle for predicting postoperative kyphosis. Medicine (Baltimore). 2018;97(47):e13335."},{"issue":"1","key":"b16","series-title":"Global Spine J","first-page":"31","article-title":"Changes in cervical sagittal alignment after single-level posterior percutaneous endoscopic cervical diskectomy","volume":"5","author":"Kim CH","year":"2015","unstructured":"Kim CH, Shin KH, Chung CK, Park SB, Kim JH. Changes in cervical sagittal alignment after single-level posterior percutaneous endoscopic cervical diskectomy. Global Spine J. 2015;5(1):31\u201338."},{"issue":"1","key":"b17","series-title":"J Neurosurg Spine","first-page":"8","article-title":"Gap between flexion and extension ranges of motion: a novel indicator to predict the loss of cervical lordosis after laminoplasty in patients with cervical spondylotic myelopathy","volume":"35","author":"Fujishiro T","year":"2021","unstructured":"Fujishiro T, Hayama S, Obo T,  Gap between flexion and extension ranges of motion: a novel indicator to predict the loss of cervical lordosis after laminoplasty in patients with cervical spondylotic myelopathy. J Neurosurg Spine. 2021;35(1):8\u201317."},{"issue":"3","key":"b18","series-title":"Neurospine","first-page":"603","article-title":"Comparative analysis with modified inclined technique for posterior endoscopic cervical foraminotomy in treating cervical osseous foraminal stenosis: radiological and midterm clinical outcomes","volume":"19","author":"Kim JY","year":"2022","unstructured":"Kim JY, Heo DH, Lee DC, Kim TH, Park CK. Comparative analysis with modified inclined technique for posterior endoscopic cervical foraminotomy in treating cervical osseous foraminal stenosis: radiological and midterm clinical outcomes. Neurospine. 2022;19(3):603\u2013615."},{"issue":"1","key":"b19","series-title":"Neurospine","first-page":"212","article-title":"Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes","volume":"19","author":"Kim JY","year":"2022","unstructured":"Kim JY, Hong HJ, Lee DC, Kim TH, Hwang JS, Park CK. Comparative analysis of 3 types of minimally invasive posterior cervical foraminotomy for foraminal stenosis, uniportal-, biportal endoscopy, and microsurgery: radiologic and midterm clinical outcomes. Neurospine. 2022;19(1):212\u2013223."},{"key":"b20","series-title":"World Neurosurg","first-page":"228","article-title":"Surgical removal of cervical extradural cysts using the biportal endoscopic approach","volume":"164","author":"Kim J","year":"2022","unstructured":"Kim J, Heo DH, Lee DC, Park CK, Chung H. Surgical removal of cervical extradural cysts using the biportal endoscopic approach. World Neurosurg. 2022;164:228\u2013236."},{"issue":"1","key":"b21","series-title":"Neurospine","first-page":"129","article-title":"Biportal endoscopic posterior thoracic laminectomy for thoracic spondylotic myelopathy caused by ossification of the ligamentum flavum: technical developments and outcomes","volume":"20","author":"Kim JY","year":"2023","unstructured":"Kim JY, Ha JS, Lee CK,  Biportal endoscopic posterior thoracic laminectomy for thoracic spondylotic myelopathy caused by ossification of the ligamentum flavum: technical developments and outcomes. Neurospine. 2023;20(1):129\u2013140."},{"key":"b22","series-title":"World Neurosurg","first-page":"e836","article-title":"Water dynamics in unilateral biportal endoscopic spine surgery and its related factors: an in vivo proportional regression and proficiency-matched study","volume":"149","author":"Hong YH","year":"2021","unstructured":"Hong YH, Kim SK, Hwang J,  Water dynamics in unilateral biportal endoscopic spine surgery and its related factors: an in vivo proportional regression and proficiency-matched study. World Neurosurg. 2021;149:e836\u2013e843."},{"issue":"1","key":"b23","series-title":"Acta Neurochir (Wien)","first-page":"182","article-title":"Biportal endoscopic cervical open-door laminoplasty to treat cervical spondylotic myelopathy","volume":"166","author":"Kim JY","year":"2024","unstructured":"Kim JY, Heo DH. Biportal endoscopic cervical open-door laminoplasty to treat cervical spondylotic myelopathy. Acta Neurochir (Wien). 2024;166(1):182."},{"key":"b24","series-title":"Front Surg","first-page":"913456","article-title":"Case report: Bilateral biportal endoscopic open-door laminoplasty with the use of suture anchors: a technical report and literature review","volume":"9","author":"Zhu C","year":"2022","unstructured":"Zhu C, Wang J, Cheng W, Wang D, Pan H, Zhang W. Case report: Bilateral biportal endoscopic open-door laminoplasty with the use of suture anchors: a technical report and literature review. Front Surg. 2022;9:913456."}],"container-title":["Journal of Neurosurgery: Spine"],"original-title":[],"link":[{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-spine\/43\/2\/article-p181.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-spine\/43\/2\/article-p181.xml","content-type":"text\/html","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-spine\/43\/2\/article-p181.xml","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T13:44:52Z","timestamp":1772804692000},"score":1,"resource":{"primary":{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-spine\/43\/2\/article-p181.xml"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,8,1]]},"references-count":48,"journal-issue":{"issue":"2"},"URL":"https:\/\/doi.org\/10.3171\/2025.2.spine241142","relation":{},"ISSN":["1547-5654"],"issn-type":[{"value":"1547-5654","type":"print"}],"subject":[],"published":{"date-parts":[[2025,8,1]]}}}