Bilateral Open Laminoplasty Using the Spinous Process as Bone Blocks

Aita, Ikuo; Yabuki, Takeshi; Wadano, Yasuyoshi

doi:10.1007/978-4-431-53983-4_10

Cited by 1 publication

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References 6 publications

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“…Nevertheless, surgeons still use autogenous iliac bone graft for an unstable segment instead of a HA spacer, and bone chips on the bilateral gutters. Few others have considered using spacers made from the base of spinous process thereby avoiding harvesting bone blocks from the iliac crest and good bony union was observed using this technique [91]. , where they noticed that both FDL and ODL resulted in significant decrease in the range of motion 6 months postoperatively.…”

Section: Addition Of T1 To C2-c7 Modelmentioning

confidence: 99%

Biomechanical effects of multi-level laminoplasty and laminectomy

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Cervical spondylotic myelopathy is the most common spinal cord disorder in persons over 55 years of age in North America and perhaps in the world. Surgical options are broadly classified into two categories namely, anterior and posterior approaches. This study focuses on the posterior based approach (i.e. laminectomy or laminoplasty) which is considered when multiple levels of the spine have to be decompressed or when most of the cord compression results from posterior pathological conditions. The external and internal behavior of the spine after laminoplasty and laminectomy has been evaluated using both experimental and computational methods. Computationally, a validated intact 3D finite element model of the cervical spine (C2-T1) was modified to simulate laminectomy and laminoplasty (open door (ODL) and double door (DDL)) at levels C3-C6. During flexion, after ODL the adjacent levels C2-C3 and C6-C7 showed a 39% and 20% increase in the motion respectively; while no substantial changes were observed at the surgically altered levels. The percent increase in motion after DDL varied from 4.3% to 34.6%. The inclination towards increased motion during flexion after double door laminoplasty explains the role of the lamina-ligamentum flavum complex in the stability of spine. Compared to the intact model, laminectomy at C3-C6 led to a profound increase (37.5% to 79.6%) in motion across the levels C2-C3 to C6-C7. Furthermore, the changes in the von Mises stresses of the intervertebral disc observed after laminoplasty and laminectomy during flexion can be correlated to the changes in the intersegmental motions. An in-vitro biomechanical study was conducted to address the effects of laminoplasty (two-level and four-level) and four-level laminectomy on the flexibility of the cervical spine. Both two-level and four-level laminoplasty resulted in minimal changes in C2-T1 range of motion. For flexion/extension, two-level and multi-level laminoplasty showed an approximate 20% decrease (p>0.05) in the range of motion at vii CHAPTER 4. EXPERIMENTAL TESTING OF CADAVERIC CERVICAL

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Section: Addition Of T1 To C2-c7 Modelmentioning

confidence: 99%

Biomechanical effects of multi-level laminoplasty and laminectomy

Kode¹

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Bilateral Open Laminoplasty Using the Spinous Process as Bone Blocks

Cited by 1 publication

References 6 publications

Biomechanical effects of multi-level laminoplasty and laminectomy

Biomechanical effects of multi-level laminoplasty and laminectomy

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