keyword
MENU ▼
Read by QxMD icon Read
search

Spinal biomechanics

keyword
https://www.readbyqxmd.com/read/29222837/low-melt-bioactive-glass-reinforced-3d-printing-akermanite-porous-cages-with-highly-improved-mechanical-properties-for-lumbar-spinal-fusion
#1
Xiurong Ke, Lei Zhang, Xianyan Yang, Juncheng Wang, Chen Zhuang, Zhouwen Jin, An Liu, Tengfei Zhao, Sanzhong Xu, Changyou Gao, Zhongru Gou, Guojing Yang
Although great strides have been made in medical technology, low back/neck pain and intervertebral disc degeneration initiated from disc degenerative disease remains a clinical challenge. Within the field of regenerative medicine therapy, we have sought to improve the biomechanical transformation of spinal fusion procedures conducted using biodegradable porous implants. Specifically, we have focused on developing mechanically strong bioceramic cages for spinal fusion and functional recovery. Herein we fabricated the akermanite (AKE) ceramic-based porous cages using low-melting bioactive glass (BG) and 3D printing technology...
December 9, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29215505/dynamic-fluctuation-of-truncal-shift-parameters-during-quiet-standing-in-healthy-young-individuals
#2
So Kato, Kai Lon Fok, Jae W Lee, Kei Masani
STUDY DESIGN: Retrospective analysis. OBJECTIVE: To describe the dynamic fluctuation of truncal shift parameters during quiet standing in healthy young individuals using biomechanical analyses. SUMMARY OF BACKGROUND DATA: Coronal decompensation (CD) and sagittal vertical axis (SVA) are the key radiographic parameters to assess static truncal stability, with the known cut-off value of 4 cm for SVA in determining severity of spinal deformity...
December 5, 2017: Spine
https://www.readbyqxmd.com/read/29204734/basic-concepts-in-metal-work-failure-after-metastatic-spine-tumour-surgery
#3
REVIEW
Naresh Kumar, Ravish Patel, Anshuja Charvi Wadhwa, Aravind Kumar, Helena Maria Milavec, Dhiraj Sonawane, Gurpal Singh, Lorin Michael Benneker
PURPOSE: The development of spinal implants marks a watershed in the evolution of metastatic spine tumour surgery (MSTS), which has evolved from standalone decompressive laminectomy to instrumented stabilization and decompression with reconstruction when necessary. Fusion may not be feasible after MSTS due to poor quality of graft host bed along with adjunct chemotherapy and/or radiotherapy postoperatively. With an increase in the survival of patients with spinal tumours, there is a probability of an increase in the rate of implant failure...
December 4, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29204193/management-and-outcome-analysis-of-pediatric-unstable-thoracolumbar-spine-injury-large-surgical-series-with-literature-review
#4
REVIEW
Guru Dutta Satyarthee, M Sangani, Sumit Sinha, Deepak Agrawal
Pediatric thoracolumbar spine fractures are considered rare injuries with paucity of publication across the globe. Further, spine injuries in children are comparatively rarer, and pediatric spine differs from adults, both biomechanically and anatomically; so, adult spine management strategy cannot be applied to pediatric cases, and exact guidelines for management of pediatric spinal injury is lacking. The current study is undertaken to study epidemiology, surgical management, and outcome of pediatric dorsolumbar unstable spine injury...
July 2017: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/29202743/posterior-intervertebral-space-debridement-annular-bone-grafting-and-instrumentation-for-treatment-of-lumbosacral-tuberculosis
#5
Weiwei Li, Jun Liu, Liqun Gong, Yongchun Zhou, Dapeng Duan
BACKGROUND: The choice of surgical methods for lumbosacral tuberculosis is controversial due to the complex anterior anatomy and peculiar biomechanics of the lumbosacral junction. The objective of this study was to explore the clinical effect of posterior intervertebral space debridement with annular bone graft fusion and fixation for the treatment of lumbosacral tuberculosis. METHODS: We retrospectively analysed data from 23 patients with lumbosacral tuberculosis who had undergone posterior intervertebral space debridement with annular bone fusion and fixation between January 2008 and September 2014...
December 4, 2017: BMC Surgery
https://www.readbyqxmd.com/read/29202506/effect-of-facetectomy-on-the-three-dimensional-biomechanical-properties-of-the-fourth-canine-cervical-functional-spinal-unit-a-cadaveric-study
#6
Nadja Bösch, Martin Hofstetter, Alexander Bürki, Beatriz Vidondo, Fenella Davies, Franck Forterre
Objective To study the biomechanical effect of facetectomy in 10 large breed dogs (>24 kg body weight) on the fourth canine cervical functional spinal unit. Methods Canine cervical spines were freed from all muscles. Spines were mounted on a six-degrees-of-freedom spine testing machine for three-dimensional motion analysis. Data were recorded with an optoelectronic motion analysis system. The range of motion was determined in all three primary motions as well as range of motion of coupled motions on the intact specimen, after unilateral and after bilateral facetectomy...
November 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/29200483/biomechanical-analysis-of-range-of-motion-and-failure-characteristics-of-osteoporotic-spinal-compression-fractures-in-human-cadaver
#7
Robert F Heary, Naresh K Parvathreddy, Nitin Agarwal
Background: Vertebroplasty is a treatment for osteoporotic vertebral compression fractures. The optimal location of needle placement for cement injection remains a topic of debate. As such, the authors assessed the effects of location of two types of cement instillations. In addition, the motion and failure modes at the index and adjacent segments were measured. Materials and Methods: Seven human osteoporotic cadaver spines (T1-L4), cut into four consecutive vertebral segments, were utilized...
November 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/29198368/trunk-musculoskeletal-response-in-maximum-voluntary-exertions-a-combined-measurement-modeling-investigation
#8
F Ghezelbash, Z El Ouaaid, A Shirazi-Adl, A Plamondon, N Arjmand
Maximum voluntary exertion (MVE) tasks quantify trunk strength and maximal muscle electromyography (EMG) activities with both clinical and biomechanical implications. The aims here are to evaluate the performance of an existing trunk musculoskeletal model, estimate maximum muscle stresses and spinal forces, and explore likely differences between males and females in maximum voluntary exertions. We, therefore, measured trunk strength and EMG activities of 19 healthy right-handed subjects (9 females and 10 males) in flexion, extension, lateral and axial directions...
November 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29194745/biomechanical-tolerance-of-whole-lumbar-spines-in-straightened-posture-subjected-to-axial-acceleration
#9
Brian D Stemper, Sajal Chirvi, Ninh Doan, Jamie L Baisden, Dennis J Maiman, William H Curry, Narayan Yoganandan, Frank A Pintar, Glenn Paskoff, Barry S Shender
Quantification of biomechanical tolerance is necessary for injury prediction and protection of vehicular occupants. This study experimentally quantified lumbar spine axial tolerance during accelerative environments simulating a variety of military and civilian scenarios. Intact human lumbar spines (T12-L5) were dynamically loaded using a custom-built drop tower. Twenty-three specimens were tested at sub-failure and failure levels consisting of peak axial forces between 2.6 and 7.9 kN and corresponding peak accelerations between 7 and 57 g...
December 1, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29191633/sensitivity-of-intervertebral-joint-forces-to-center-of-rotation-location-and-trends-along-its-migration-path
#10
Marco Senteler, Ameet Aiyangar, Bernhard Weisse, Mazda Farshad, Jess G Snedeker
Translational vertebral motion during functional tasks manifests itself in dynamic loci for center of rotation (COR). A shift of COR affects moment arms of muscles and ligaments; consequently, muscle and joint forces are altered. Based on posture- and level-specific trends of COR migration revealed by in vivo dynamic radiography during functional activities, it was postulated that the instantaneous COR location for a particular joint is optimized in order to minimize the joint reaction forces. A musculoskeletal multi-body model was employed to investigate the hypotheses that (1) a posterior COR in upright standing and (2) an anterior COR in forward flexed posture leads to optimized lumbar joint loads...
November 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29186600/an-in-vitro-biomechanical-model-of-differing-pedicle-screw-configurations-for-long-construct-segmental-thoracic-fixation
#11
Alexander Tuchman, Alexander W L Turner, Melodie F Metzger, Frank L Acosta
BACKGROUND: The optimum pattern of pedicle screw (PS) fixation during long-segment thoracic fixation has not been determined. OBJECTIVE: To evaluate rod stress and construct stability with minimal, alternating, skipped, and bilateral PS constructs in the iatrogenically destabilized thoracic spine. METHODS: Eight cadaveric thoracic specimens (T3-T12) were initially tested intact to ±5 Nm using a custom 6 degree-of-freedom spine testing apparatus in flexion-extension (FE), lateral bending (LB), and axial rotation...
December 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29181398/rheumatoid-arthritis-affecting-the-upper-cervical-spine-biomechanical-assessment-of-the-stabilizing-ligaments
#12
Carolin Meyer, Jan Bredow, Elisa Heising, Peer Eysel, Lars Peter Müller, Gregor Stein
Diameters of anterior and posterior atlantodental intervals (AADI and PADI) are diagnostically conclusive regarding ongoing neurological disorders in rheumatoid arthritis. MRI and X-ray are mostly used for patients' follow-up. This investigation aimed at analyzing these intervals during motion of cervical spine, when transverse and alar ligaments are damaged. AADI and PADI of 10 native, human cervical spines were measured using lateral fluoroscopy, while the spines were assessed in neutral position first, in maximal inclination second, and in maximal extension at last...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29171424/interactions-of-primary-insult-biomechanics-and-secondary-cascades-in-spinal-cord-injury-implications-for-therapy
#13
Michael B Orr, John C Gensel
No abstract text is available yet for this article.
October 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29169117/3d-correction-over-2years-with-anterior-vertebral-body-growth-modulation-a-finite-element-analysis-of-screw-positioning-cable-tensioning-and-postoperative-functional-activities
#14
Nikita Cobetto, Stefan Parent, Carl-Eric Aubin
BACKGROUND: Anterior vertebral body growth modulation is a fusionless instrumentation to correct scoliosis using growth modulation. The objective was to biomechanically assess effects of cable tensioning, screw positioning and post-operative position on tridimensional correction. METHODS: The design of experiments included two variables: cable tensioning (150/200N) and screw positioning (lateral/anterior/triangulated), computationally tested on 10 scoliotic cases using a personalized finite element model to simulate spinal instrumentation, and 2years growth modulation with the device...
November 16, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29160901/dietary-advanced-glycation-end-products-have-sex-and-age-dependent-effects-on-vertebral-bone-microstructure-and-mechanical-function-in-mice
#15
Svenja Illien-Jünger, Paolo Palacio-Mancheno, William F Kindschuh, Xue Chen, Grazyna E Sroga, Deepak Vashishth, James C Iatridis
Back pain is a leading cause of global disability that can arise from vertebral fracture and osteoporosis. While poor general health and obesity are among the strongest risk factors for back pain, there is remarkably little known about how diet influences spinal diseases. Advanced glycation endproducts (AGEs) are implicated in increased fracture risk, yet no studies investigated how dietary AGEs affect spinal health. We tested the hypothesis that high dietary AGE ingestion will diminish vertebral structure and function in a sex- and age-dependent manner...
November 21, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29157658/continuous-ambulatory-hand-force-monitoring-during-manual-materials-handling-using-instrumented-force-shoes-and-an-inertial-motion-capture-suit
#16
G S Faber, A S Koopman, I Kingma, C C Chang, J T Dennerlein, J H van Dieën
Hand forces (HFs) are commonly measured during biomechanical assessment of manual materials handling; however, it is often a challenge to directly measure HFs in field studies. Therefore, in a previous study we proposed a HF estimation method based on ground reaction forces (GRFs) and body segment accelerations and tested it with laboratory equipment: GFRs were measured with force plates (FPs) and segment accelerations were measured using optical motion capture (OMC). In the current study, we evaluated the HF estimation method based on an ambulatory measurement system, consisting of inertial motion capture (IMC) and instrumented force shoes (FSs)...
October 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29147083/spinal-cord-stimulation-in-failed-back-surgery-syndrome-effects-on-posture-and-gait-a-preliminary-3d-biomechanical-study
#17
L Brugliera, A De Luca, S Corna, M Bertolotto, G A Checchia, M Cioni, P Capodaglio, C Lentino
We studied 8 patients with spinal cord stimulation (SCS) devices which had been previously implanted to treat neuropathic chronic pain secondary to Failed Back Surgery Syndrome. The aim of our study was to investigate the effects of SCS on posture and gait by means of clinical scales (Short Form Health Survey-36, Visual Analogue Scale for pain, and Hamilton Depression Rating Scale) and instrumented evaluation with 3D Gait Analysis using a stereophotogrammetric system. The latter was performed with the SCS device turned both OFF and ON...
2017: Pain Research & Management: the Journal of the Canadian Pain Society
https://www.readbyqxmd.com/read/29145437/assessment-of-the-suitability-of-biodegradable-rods-for-use-in-posterior-lumbar-fusion-an-in-vitro-biomechanical-evaluation-and-finite-element-analysis
#18
Fon-Yih Tsuang, Yueh-Ying Hsieh, Yi-Jie Kuo, Chia-Hsien Chen, Feng-Huei Lin, Chen-Sheng Chen, Chang-Jung Chiang
Interbody fusion with posterior instrumentation is a common method for treating lumbar degenerative disc diseases. However, the high rigidity of the fusion construct may produce abnormal stresses at the adjacent segment and lead to adjacent segment degeneration (ASD). As such, biodegradable implants are becoming more popular for use in orthopaedic surgery. These implants offer sufficient stability for fusion but at a reduced stiffness. Tailored to degrade over a specific timeframe, biodegradable implants could potentially mitigate the drawbacks of conventional stiff constructs and reduce the loading on adjacent segments...
2017: PloS One
https://www.readbyqxmd.com/read/29133001/effects-of-low-bone-mineral-status-on-biomechanical-characteristics-in-idiopathic-scoliotic-spinal-deformity
#19
Xiao-Xing Song, Lin-Yu Jin, Xin-Feng Li, Lie Qian, Hong-Xing Shen, Zu-De Liu, Bu-Wei Yu
BACKGROUND: Low bone mass in adolescent idiopathic scoliosis patients has been well reported. Poor bone quality was regarded as a new and unique prognostic factor in aggravating the curve progression. However, the potential biomechanical correlation between them remains unclear. METHODS: Three-dimensional finite element models of idiopathic scoliotic spine with different bone mineral status were created for axial loading simulation. Axial load of three different body weights were applied on different bone mineral mass models...
November 10, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29126607/effect-of-pedicle-screw-diameter-on-screw-fixation-efficacy-in-human-osteoporotic-thoracic-vertebrae
#20
Dar-Ming Lai, Yu-Tang Shih, Yi-Hsing Chen, Andy Chien, Jaw-Lin Wang
The selection of an ideal screw size plays a crucial role in the success of spinal instrumentation as larger diameter screws are thought to provide better fixation strength but increase the risk of pedicle failure during insertion. On the other hand, smaller diameter screws are with lesser risk of pedicle breakage but are thought to compromise the stability of the instrumentation. By investigating the relationship between screw diameter and the pullout strength of pedicle screws after fatigue loading, this study seeks to find quantitative biomechanical data for surgeons in determining the most ideal diameter size screws when performing surgical implementations on osteoporotic vertebrae...
October 25, 2017: Journal of Biomechanics
keyword
keyword
14448
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"