{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T01:55:35Z","timestamp":1769910935502,"version":"3.49.0"},"reference-count":22,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2002,1]]},"abstract":"<jats:p content-type=\"fine-print\"><jats:italic>Object.<\/jats:italic> The authors report a simple method for bilateral open-door cervical expansive laminoplasty in which hydroxyapatite (HA) spacers are secured by titanium screws. A biomechanical study was also conducted to confirm the strength of the screw fixation.<\/jats:p>\n<jats:p content-type=\"fine-print\"><jats:italic>Methods.<\/jats:italic> A unilateral posterior approach was used to allow preservation of the posterior supporting elements (the posterior tension band) until the laminae were cut at the base. A bilateral open-door expansive laminotomy was then performed in standard fashion. Appropriate-sized HA spacers were selected, held with a specially designed holder, and placed between the split laminae. The screw holes were made in the laminae along the direction of the screw holes in the spacer, and two screws were inserted ventrolaterally to the laminae, resulting in instantaneous fixation. This procedure was performed in 15 patients; clinical results were successful, and there were no significant intraoperative complications. Follow-up radiological studies revealed no evidence of displacement of the spacers or screw backout. The screw artifacts observed on magnetic resonance imaging were minimal, allowing evaluation of the cervical spinal cord. The sagittal alignment of the cervical spine was well preserved. In the biomechanical studies the authors found that the screw fixation was of satisfactory strength, compared with other methods of fixation.<\/jats:p>\n<jats:p content-type=\"fine-print\"><jats:italic>Conclusions.<\/jats:italic> Bilateral open-door cervical expansive laminoplasty in which HA spacers are secured by titanium screws is a simple and quick method that yields sufficient fixation strength.<\/jats:p>","DOI":"10.3171\/spi.2002.96.1.0022","type":"journal-article","created":{"date-parts":[[2009,5,7]],"date-time":"2009-05-07T15:56:22Z","timestamp":1241711782000},"page":"22-28","source":"Crossref","is-referenced-by-count":36,"title":["Bilateral open-door cervical expansive laminoplasty with hydroxyapatite spacers and titanium screws"],"prefix":"10.3171","volume":"96","author":[{"given":"Masakazu","family":"Takayasu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Teruhide","family":"Takagi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshihisa","family":"Nishizawa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Koji","family":"Osuka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takehiko","family":"Nakajima","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Yoshida","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1","series-title":"Spine","doi-asserted-by":"publisher","first-page":"2738","DOI":"10.1097\/00007632-199812150-00014","article-title":"Postlaminectomy kyphosis.","volume":"23","author":"Albert","year":"1998"},{"key":"b2","series-title":"Spine","doi-asserted-by":"publisher","first-page":"139","DOI":"10.1097\/00007632-197706000-00006","article-title":"Long-term follow-up of surgical treatment of cervical spondylotic myelopathy.","volume":"2","author":"Crandall","year":"1977"},{"key":"b3","series-title":"Spine","doi-asserted-by":"publisher","first-page":"864","DOI":"10.1097\/00007632-198807000-00031","article-title":"The surgical management of cervical spinal stenosis, spondylosis, and myeloradiculopathy by means of the posterior approach.","volume":"13","author":"Epstein","year":"1988"},{"key":"b4","series-title":"Spinal Surg","doi-asserted-by":"publisher","first-page":"293","DOI":"10.2531\/spinalsurg.12.293","article-title":"Surgical results of the double door laminoplasty splitting the spinous processes preserving the posterior supporting structures.","volume":"12","author":"Fujita","year":"1998"},{"key":"b5","series-title":"Neurosurgery","first-page":"235","article-title":"En bloc laminoplasty performed with threadwire saw.","volume":"48","author":"Hara","year":"2001"},{"key":"b6","series-title":"Spine","doi-asserted-by":"publisher","first-page":"693","DOI":"10.1097\/00007632-198310000-00003","article-title":"Expansive opendoor laminoplasty for cervical spinal stenotic myelopathy.","volume":"8","author":"Hirabayashi","year":"1983"},{"key":"b7","series-title":"Clin Orthop","first-page":"281","article-title":"Long-term study of large ceramic implants (porous hydroxyapatite) in dog femora.","volume":"187","author":"Hoogendoorn","year":"1984"},{"key":"b8","series-title":"J Bone Joint Surg (Br)","first-page":"325","article-title":"Laminectomy versus laminoplasty for cervical myelopathy: brief report.","volume":"70","author":"Hukuda","year":"1988"},{"key":"b9","series-title":"Nippon Seikeigeka Gakkai Zasshi","first-page":"1033","article-title":"[Roentgenographic studies on the normal pattern of the cervical curvature.]","volume":"42","author":"Ishihara","year":"1968"},{"key":"b10","series-title":"J Neurosurg (Spine 2)","doi-asserted-by":"publisher","first-page":"199","DOI":"10.3171\/spi.2000.93.2.0199","article-title":"Incidence and outcome of kyphotic deformity following laminectomy for cervical spondylotic myelopathy.","volume":"93","author":"Kaptain","year":"2000"},{"key":"b11","series-title":"Tohoku J Exp Med","doi-asserted-by":"publisher","first-page":"337","DOI":"10.1620\/tjem.173.337","article-title":"Histological verification of bone bonding and ingrowth into porous hydroxyapatite spinous process spacer for cervical laminoplasty.","volume":"173","author":"Kokubun","year":"1994"},{"key":"b12","series-title":"Neurosurgery","doi-asserted-by":"publisher","first-page":"430","DOI":"10.1227\/00006123-199509000-00010","article-title":"Spinous process-splitting laminoplasty with an extended foraminotomy for cervical myelopathy.","volume":"37","author":"Koshu","year":"1995"},{"key":"b13","series-title":"Surg Neurol","doi-asserted-by":"publisher","first-page":"663","DOI":"10.1016\/0090-3019(85)90128-4","article-title":"Cervical laminoplasty using apatite beads as implants. 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