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Intervertebral Disc Mechanics

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https://www.readbyqxmd.com/read/28208824/associations-between-obesity-and-spinal-diseases-a-medical-expenditure-panel-study-analysis
#1
Binwu Sheng, Chaoling Feng, Donglan Zhang, Hugh Spitler, Lu Shi
Background: The link between body weight status and spinal diseases has been suggested by a number of cross-sectional and cohort studies with a limited range of patient populations. No population-representative samples have been used to examine the link between obesity and spinal diseases. The present study is based on a nationally representative sample drawn from the Medical Expenditure Panel Survey. Methods: Using the cross-sectional sample of the 2014 Medical Expenditure Panel Study, we built four weighted logistic regression analyses of the associations between body weight status and the following four spinal diseases: low back pain, spondylosis, other cervical disorders and intervertebral disc disorder (IDD)...
February 13, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28207656/biomechanical-evaluation-of-transpedicular-nucleotomy-with-intact-annulus-fibrosus
#2
Fabrizio Russo, Robert A Hartman, Kevin M Bell, Nam Vo, Gwendolyn A Sowa, James D Kang, Gianluca Vadalà, Vincenzo Denaro
STUDY DESIGN: Biomechanical testing of partially nucleotomized ovine cadaveric spines. OBJECTIVE: To explore how the nucleus pulposus (NP) affects the biomechanical behavior of the intervertebral disc (IVD) by performing a partial nucleotomy via the transpedicular approach. SUMMARY OF BACKGROUND DATA: Mechanical loading represents a crucial part of IVD homeostasis. However, traditional regenerative strategies require violation of the annulus fibrosus (AF) resulting in significant alteration of joint mechanics...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28171773/cervical-traction-therapy-with-and-without-neck-support-a-finite-element-analysis
#3
Kuan Wang, Huihao Wang, Zhen Deng, Zhengyan Li, Hongsheng Zhan, Wenxin Niu
BACKGROUND: Cervical traction is commonly used for treating neck pain. However, few studies have investigated the biomechanical impact such traction has on soft tissues. OBJECTIVES: To analyze the biomechanics of cervical traction therapy in a supine position with and without neck support (NS and non-NS). METHODS: A finite element model of the cervical spine was constructed to investigate the mechanism behind cervical traction therapy. An axial traction force of 100-N was loaded on the upper surface of C0 to simulate traction weight...
January 16, 2017: Musculoskelet Sci Pract
https://www.readbyqxmd.com/read/28167249/how-are-adjacent-spinal-levels-affected-by-vertebral-fracture-and-by-vertebroplasty-a-biomechanical-study-on-cadaveric-spines
#4
Jin Luo, Deborah J Annesley-Williams, Michael A Adams, Patricia Dolan
BACKGROUND CONTEXT: Spinal injuries and surgery may have important effects at neighbouring spinal levels, but previous investigations of adjacent-level biomechanics have produced conflicting results. We use 'stress profilometry' and non-contact strain measurements to investigate thoroughly this long-standing problem. PURPOSE: To determine how vertebral fracture and vertebroplasty affect compressive load-sharing and vertebral deformations at adjacent spinal levels...
February 3, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28164163/change-of-sagittal-spinal-alignment-and-its-association-with-pain-and-function-after-lumbar-surgery-augmented-with-an-interspinous-implant
#5
Rebecca J Crawford, Quentin J Malone, Roger I Price
BACKGROUND: Interspinous spacer/implants like the Device for Intervertebral Assisted Motion (DIAM™) are controversially yet commonly used in the surgical treatment of lumbar degenerative pathologies. Criticism is based on ill-defined indications, lack of superiority over decompression, and a poorly understood mechanical effect. Yet, continued use by surgeons implies their perceived clinical merit. We examined radiographic spinal alignment for 12 months, and pain and function for 24 months, after DIAM-augmented surgery to improve the understanding of the mechanical effect relating to clinical outcomes in patients...
2017: Scoliosis and Spinal Disorders
https://www.readbyqxmd.com/read/28149534/iapp-modulates-cellular-autophagy-apoptosis-and-extracellular-matrix-metabolism-in-human-intervertebral-disc-cells
#6
Xinghuo Wu, Yu Song, Wei Liu, Kun Wang, Yong Gao, Shuai Li, Zhenfeng Duan, Zengwu Shao, Shuhua Yang, Cao Yang
The pathogenic process of intervertebral disc degeneration (IDD) is characterized by imbalance in the extracellular matrix (ECM) metabolism. Nucleus pulposus (NP) cells have important roles in maintaining the proper structure and tissue homeostasis of disc ECM. These cells need adequate supply of glucose and oxygen. Islet amyloid polypeptide (IAPP) exerts its biological effects by regulating glucose metabolism. The purpose of this study was to investigate the expression of IAPP in degenerated IVD tissue, and IAPP modulation of ECM metabolism in human NP cells, especially the crosstalk mechanism between apoptosis and autophagy in these cells...
2017: Cell Death Discovery
https://www.readbyqxmd.com/read/28146016/individual-collagen-fibril-thickening-and-stiffening-of-annulus-fibrosus-in-degenerative-intervertebral-disc
#7
Ting Liang, Lin-Lin Zhang, Wei Xia, Hui-Lin Yang, Zong-Ping Luo
STUDY DESIGN: In vitro study using rat intervertebral discs (IVDs). OBJECTIVE: To explore the alteration of annulus fibrosus collagen fibrils after loading on IVD and to investigate the degeneration pathogenesis at the nanoscale. SUMMARY OF BACKGROUND DATA: Abnormal loading can lead to IVD degeneration, but the precise mechanism has been hitherto elusive, especially at the nanoscale. METHODS: A rat IVD loading model was used, which combined bending of the tail by 40° with compressive loading of 1...
January 31, 2017: Spine
https://www.readbyqxmd.com/read/28130014/-biology-and-mechanobiology-of-the-intervertebral-disc
#8
Emilio González Martínez, José García-Cosamalón, Iván Cosamalón-Gan, Marta Esteban Blanco, Olivia García-Suarez, José A Vega
The intervertebral disc (IVD) is noted for its low cell content, and being the largest avascular structure of human body. The low amount of cells in the disc have to adapt to an anaerobic metabolism with low oxygen pressure and acidic pH. Apart from surviving in an adverse microenvironment, they are exposed to a high level of mechanical stress. The biological adaptation of cells to acidosis and hyperosmolarity conditions are regulated by mechanoproteins, which are responsible for converting a mechanical signal into a cellular response, thus modifying its gene expression...
January 24, 2017: Neurocirugía
https://www.readbyqxmd.com/read/28128000/assessment-and-rehabilitation-of-chronic-low-back-pain-in-baseball-part-ii
#9
Joseph G Wasser, Jason L Zaremski, Daniel C Herman, Heather K Vincent
Repetitive throwing and hitting motions in baseball place mechanical stresses to the lumbar spine which may cause low back pain (LBP). Pain may be due to vertebral stress reactions or insufficiency fractures, intervertebral disc degeneration or intervertebral disc herniation. Untreated chronic conditions have high potential to lead to a more significant injury such as spondylolysis. Chronic LBP increases the risk for missed playing time, early career termination and lower quality of life after retirement. Proper clinical assessment and prevention/rehabilitation of LBP in this population is thus important for performance, play time and overall long-term quality of life...
January 27, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28125208/shape-recovery-with-concomitant-mechanical-strengthening-of-amphiphilic-shape-memory-polymers-in-warm-water
#10
Ben Zhang, Janae E DeBartolo, Jie Song
Maintaining adequate or enhancing mechanical properties of shape memory polymers (SMPs) after shape recovery in an aqueous environment are greatly desired for biomedical applications of SMPs as self-fitting tissue scaffolds or minimally invasive surgical implants. Here we report stable temporary shape fixing and facile shape recovery of biodegradable triblock amphiphilic SMPs containing a poly(ethylene glycol) (PEG) center block and flanking poly(lactic acid) or poly(lactic-co-glycolic acid) blocks in warm water, accompanied by concomitant enhanced mechanical strengths...
January 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28120948/il-1%C3%AE-induces-apoptosis-and-autophagy-via-mitochondria-pathway-in-human-degenerative-nucleus-pulposus-cells
#11
Jieliang Shen, Shengxi Xu, Hao Zhou, Huzhe Liu, Wei Jiang, Jie Hao, Zhenming Hu
IL-1β has been reported highly expressed in degenerative intervertebral disc, and our previous study indicated IL-1β facilitates apoptosis of human degenerative nucleus pulposus (NP) cell. However, the underlying molecular mechanism remains unclear. We here demonstrate that IL-1β played a significantly pro-apoptotic effect under serum deprivation. IL-1β decreased Bcl-2/Bax ratio and enhanced cytochrome C released from mitochondria to cytosol, which proved mitochondria-meidated apoptosis was induced. Subsequently, mitochondria damage was detected under IL-1β stimualtion...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28108405/defects-of-the-vertebral-endplate-implications-for-disc-degeneration-depend-on-size
#12
Uruj Zehra, Luke Flower, Katharine Robson-Brown, Michael A Adams, Patricia Dolan
BACKGROUND CONTEXT: Bony vertebral endplates must be porous to allow metabolite transport into the disc, and yet strong to resist high intradiscal pressure. Endplate defects may therefore have nutritional and mechanical consequences for the disc, depending on their size and type. We hypothesise that broad, diffuse defects are more closely associated with disc decompression and degeneration than are focal Schmorl's node-type defects. PURPOSE: To determine how the size and type of endplate defects are related to decompression and degeneration in the adjacent intervertebral disc...
January 17, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28104539/whole-body-vibration-of-mice-induces-progressive-degeneration-of-intervertebral-discs-associated-with-increased-expression-of-il-1%C3%AE-and-multiple-matrix-degrading-enzymes
#13
M R McCann, M Veras, C Yeung, G Lalli, P Patel, K M Leitch, D W Holdsworth, S J Dixon, C A Séguin
OBJECTIVE: Whole-body vibration (WBV) is a popular fitness trend based on claims of increased muscle mass, weight loss and reduced joint pain. Following its original implementation as a treatment to increase bone mass in patients with osteoporosis, WBV has been incorporated into clinical practice for musculoskeletal disorders, including back pain. However, our recent studies revealed damaging effects of WBV on joint health in a murine model. In this report, we examined potential mechanisms underlying disc degeneration following exposure of mice to WBV...
January 16, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28102712/bone-morphogenetic-protein-2-and-7-mediate-the-anabolic-function-of-nucleus-pulposus-cells-with-discrete-mechanisms
#14
Victor Yl Leung, Lixiong Zhou, Wai-Kit Tam, Yi Sun, Fengjuan Lv, Guangqian Zhou, Kenneth Mc Cheung
Bone morphogenetic proteins (BMPs) play roles in promoting cell anabolism, especially extracellular matrix production. The difference between BMP members in their capacity to modulate intervertebral disc cell activity is yet to be defined. BMP-7/OP-1 has been shown to retard disc degeneration. We compared the activity of BMP-7 with BMP-2 on nucleus pulposus (NP) cell phenotype and function, and investigated how they differentially affect the gene expression profiles of signaling cascade components in human NP cells under degenerative states...
January 19, 2017: Connective Tissue Research
https://www.readbyqxmd.com/read/28087442/hydrogen-sulfide-protects-against-endoplasmic-reticulum-stress-and-mitochondrial-injury-in-nucleus-pulposus-cells-and-ameliorates-intervertebral-disc-degeneration
#15
Daoliang Xu, Haiming Jin, Jianxia Wen, Jiaoxiang Chen, Deheng Chen, Ningyu Cai, Yongli Wang, Jianle Wang, Yu Chen, Xiaolei Zhang, Xiangyang Wang
It has been suggested that excessive apoptosis in intervertebral disc cells induced by inflammatory cytokines, such as interleukin (IL)-1β, is related to the process of intervertebral disc degeneration (IVDD). Hydrogen sulfide (H2S), a gaseous signaling molecule, has drawn attention for its anti-apoptosis role in various pathophysiological processes in degenerative diseases. To date, there has been no investigation of the correlation of H2S production and IVDD or of the effects of H2S on IL-1β-induced apoptosis in nucleus pulposus (NP) cells...
January 10, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28081267/single-nucleotide-variants-of-candidate-genes-in-aggrecan-metabolic-pathway-are-associated-with-lumbar-disc-degeneration-and-modic-changes
#16
Romain Shanil Perera, Poruwalage Harsha Dissanayake, Upul Senarath, Lalith Sirimevan Wijayaratne, Aranjan Lional Karunanayake, Vajira Harshadeva Weerabaddana Dissanayake
INTRODUCTION: Lumbar disc degeneration (LDD) is genetically determined and severity of LDD is associated with Modic changes. Aggrecan is a major proteoglycan in the intervertebral disc and end plate. Progressive reduction of aggrecan is a main feature of LDD and Modic changes. OBJECTIVES: The study investigated the associations of single nucleotide variants (SNVs) of candidate genes in the aggrecan metabolic pathway with the severity of LDD and Modic changes. In-silico functional analysis of significant SNVs was also assessed...
2017: PloS One
https://www.readbyqxmd.com/read/28019241/a-regenerative-approach-towards-recovering-the-mechanical-properties-of-degenerated-intervertebral-discs-genipin-and-platelet-rich-plasma-therapies
#17
Mohammad Nikkhoo, Jaw-Lin Wang, Masoud Abdollahi, Yu-Chun Hsu, Mohamad Parnianpour, Kinda Khalaf
Degenerative disc disease, associated with discrete structural changes in the peripheral annulus and vertebral endplate, is one of the most common pathological triggers of acute and chronic low back pain, significantly depreciating an individual's quality of life and instigating huge socioeconomic costs. Novel emerging therapeutic techniques are hence of great interest to both research and clinical communities alike. Exogenous crosslinking, such as Genipin, and platelet-rich plasma therapies have been recently demonstrated encouraging results for the repair and regeneration of degenerated discs, but there remains a knowledge gap regarding the quantitative degree of effectiveness and particular influence on the mechanical properties of the disc...
December 1, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28012886/biomechanical-and-endplate-effects-on-nutrient-transport-in-the-intervertebral-disc
#18
Morgan B Giers, Bryce T Munter, Kyle J Eyster, George D Ide, Anna G U S Newcomb, Jennifer N Lehrman, Evgenii Belykh, Vadim A Byvaltsev, Brian P Kelly, Mark C Preul, Nicholas Theodore
BACKGROUND: Physical data are lacking on nutrient transport in human intervertebral discs (IVDs), which supports regeneration. Our objective was to study nutrient transport in porcine IVDs to determine the effects of biomechanical and physiological factors. METHODS: In vitro testing of whole porcine IVDs was performed under different loading conditions. Fifty cervical, thoracic, and lumbar discs with attached end plates were removed from 4 Yorkshire pigs (90-150 pounds)...
December 21, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/28012080/three-dimensional-micro-computed-tomography-analysis-for-spinal-instability-after-lumbar-facetectomy-in-the-rat
#19
Daisuke Fukui, Mamoru Kawakami, Kevin Cheng, Koichiro Murata, Keianne Yamada, Rinoka Sato, Munehito Yoshida, Hiroshi Yamada, Nozomu Inoue, Koichi Masuda
PURPOSE: Intervertebral disc degeneration is thought to contribute to low back pain. However, the pathophysiological mechanisms remain controversial. In a previous study, we developed an animal model that showed delayed gait disturbance after lumbar facetectomy in the rat. We believe that this gait disturbance was caused by low back pain, although the mechanisms of this gait abnormality remain unknown. The purpose of this study was to evaluate structural changes of the lumbar spine after facetectomy in the rat utilizing three-dimensional micro-computed tomography (3DμCT) compared to histology...
December 23, 2016: European Spine Journal
https://www.readbyqxmd.com/read/28011632/a-developmental-transcriptomic-analysis-of-pax1-and-pax9-in-embryonic-intervertebral-disc-development
#20
V Sivakamasundari, Petra Kraus, Wenjie Sun, Xiaoming Hu, Siew Lan Lim, Shyam Prabhakar, Thomas Lufkin
Pax1 and Pax9 play redundant, synergistic functions in the patterning and differentiation of the sclerotomal cells that give rise to the vertebral bodies and intervertebral discs (IVD) of the axial skeleton. They are conserved in mice and humans, whereby mutation/deficiency of human PAX1/PAX9 has been associated with kyphoscoliosis. By combining cell-type-specific transcriptome and ChIP-sequencing data, we identified the roles of Pax1/Pax9 in cell proliferation, cartilage development and collagen fibrillogenesis, which are vital in early IVD morphogenesis...
February 15, 2017: Biology Open
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