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Dynamic cervical implant

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https://www.readbyqxmd.com/read/29627629/hybrid-constructs-for-performing-three-level-hybrid-surgery-a-finite-element-study
#1
Yang Li, Jia Zhu, Zhenhua Liao, Zhenjun Zhang, Weiqiang Liu
This study aimed to systematically investigate the effect of three-level hybrid constructs on the cervical spine biomechanics based on a validated model of the C3-C7 segments. Three hybrid constructs with two U-shaped dynamic cervical implants (DCIs) and one cage were simulated. The three constructs were (1) Cage-U-U (cage implanted at the C3-C4 level and U-shaped DCIs implanted at the C4-C5 and C5-C6 levels), (2) U-Cage-U, and (3) U-U-Cage. Biomechanical parameters including moments, cervical motions, and stresses in the facet and implants were analyzed in flexion and extension...
April 5, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29615017/clinical-and-radiographic-outcome-of-dynamic-cervical-implant-dci-arthroplasty-for-degenerative-cervical-disc-disease-a-minimal-five-year-follow-up
#2
Lin-Nan Wang, Bo-Wen Hu, Lei Wang, Yue-Ming Song, Xi Yang, Li-Min Liu, Hao Liu
BACKGROUND: To evaluate the mid- to long-term clinical and radiographic outcomes of anterior cervical discectomy and dynamic cervical implant (DCI) arthroplasty for degenerative cervical disc disease. METHODS: From April 2010 to October 2010, 38 patients with single- or double-level cervical disc herniation underwent anterior cervical discectomy and DCI arthroplasty. The clinical results and radiographic outcomes of these 38 patients (42 levels) were retrospectively evaluated...
April 4, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29563181/intralimb-and-interlimb-cutaneous-reflexes-during-locomotion-in-the-intact-cat
#3
Marie-France Hurteau, Yann Thibaudier, Charline Dambreville, Simon M Danner, Ilya Rybak, Alain Frigon
When the foot contacts an obstacle during locomotion, cutaneous inputs activate spinal circuits to ensure dynamic balance and forward progression. In quadrupeds, this requires coordinated reflex responses between the four limbs. Here, we investigated the patterns and phasic modulation of cutaneous reflexes in fore- and hindlimb muscles evoked by inputs from all four limbs. Five female cats were implanted to record muscle activity and to stimulate the superficial peroneal and superficial radial nerves during locomotion...
March 21, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29557926/stiffness-matters-part-ii-the-effects-of-plate-stiffness-on-load-sharing-and-the-progression-of-fusion-following-acdf-in-vivo
#4
Joshua M Peterson, Carolyn Chlebek, Ashley M Clough, Alexandra K Wells, Kathleen E Batzinger, John M Houston, Katerina Kradinova, Joseph C Glennon, Darryl J DiRisio, Eric H Ledet
STUDY DESIGN: Real time in vivo measurement of forces in the cervical spine of goats following anterior cervical discectomy and fusion (ACDF). OBJECTIVE: To measure interbody forces in the cervical spine during the time course of fusion following ACDF with plates of different stiffnesses. SUMMARY OF BACKGROUND DATA: Following ACDF, the biomechanics of the arthrodesis is largely dictated by the plate. The properties of the plate prescribe the extent of load-sharing through the disc space versus the extent of stress-shielding...
March 19, 2018: Spine
https://www.readbyqxmd.com/read/29544627/the-ovarian-cycle
#5
JoAnne S Richards
The "ovarian cycle" is an exquisite and dynamic endocrine system that includes ovarian events, hypothalamic-pituitary interactions, uterine endometrial and myometrial changes during implantation and pregnancy, cervical alterations in structure, and breast development. The ovarian cycle and the steroid hormones produced by the ovary also impact epithelial cancer development in the ovary, uterus, cervix, and breast. This chapter provides a personal view of recent developments that occur in this complex endocrine environment...
2018: Vitamins and Hormones
https://www.readbyqxmd.com/read/29456339/retrospective-analysis-of-arthrodesis-from-various-options-after-anterior-cervical-discectomy
#6
Vinaysagar Sharma, Shashwat Kumar Singh
Introduction: Anterior cervical discectomy is a surgical procedure performed to treat a herniated/degenerated disc in the cervical region. There have been various studies comparing arthrodesis rates among various procedures. Our patients belonged to varied socioeconomic background and underwent anterior cervical microdiscectomy without/with instrumentation. Aim: The present study was performed to study and compare the arthrodesis rates in the patients operated for anterior cervical microdiscectomy with and without fusion/instrumentation procedures at our institution...
January 2018: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/29452282/load-sharing-through-elastic-micro-motion-accelerates-bone-formation-and-interbody-fusion
#7
Eric H Ledet, Glenn P Sanders, Darryl J DiRisio, Joseph C Glennon
BACKGROUND: Context: Achieving a successful spinal fusion requires the proper biologic and biomechanical environment. Optimizing load-sharing in the interbody space can enhance bone formation. For anterior cervical discectomy and fusion (ACDF), loading and motion are largely dictated by the stiffness of the plate which can facilitate a balance between stability and load-sharing. The advantages of load-sharing may be substantial for patients with comorbidities and in multi-level procedures where pseudarthrosis rates are significant...
February 13, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29383502/influences-of-different-lower-cervical-bone-graft-heights-on-the-size-of-the-intervertebral-foramen-multiple-planar-dynamic-measurements-with-laser-scanning
#8
Rui Yang, Mengjun Ma, Lin Huang, Jichao Ye, Yong Tang, Peng Wang, Dezhen Yin, Keng Chen, Weiping Li, Huiyong Shen
The aim of this study is to evaluate the influences of different bone graft heights on the size of the intervertebral foramen, which will help determine the optimal graft height in clinical practice. Six fresh adult cadavers were used, with the C5-C6 vertebral column segment defined as the functional spinal unit (FSU). After discectomy, the C5/6 intervertebral height was set as the baseline height (normal disc height). We initially used spiral computed tomography (CT) to scan and measure the middle area of the intervertebral foramen when at the baseline height...
January 30, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29220729/comparison-of-dynamic-cervical-implant-versus-anterior-cervical-discectomy-and-fusion-for-the-treatment-of-single-level-cervical-degenerative-disc-disease-a-five-year-follow-up
#9
Ce Zhu, Xi Yang, Lei Wang, Bo-Wen Hu, Li-Min Liu, Lin-Nan Wang, Hao Liu, Yue-Ming Song
OBJECTIVE: To compare clinical and radiographic outcomes of dynamic cervical implant(DCI) with anterior cervical discectomy and fusion(ACDF) in the treatment of single-level cervical degenerative disc disease (CDDD) 5 years after surgery. PATIENTS AND METHODS: Forty-three patients with DCI were matched one-to-one with patients with ACDF based on age, gender, and operative segment in this retrospective study. All patients had been followed up for more than 5 years...
January 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29076467/-analysis-of-the-results-of-total-cervical-disc-arthroplasty-using-a-m6-c-prosthesis-a-multicenter-study
#10
V A Byval'tsev, A A Kalinin, I A Stepanov, Yu Ya Pestryakov, V V Shepelev
Cervical spondylosis and intervertebral disc (IVD) degeneration are the most common cause for compression of the spinal cord and/or its roots. Total IVD arthroplasty, as a modern alternative to surgical treatment of IVD degeneration, is gaining popularity in many neurosurgical clinics around the world. Aim - the study aim was to conduct a multicenter analysis of cervical spine arthroplasty with an IVD prosthesis M6-C ('Spinal Kinetics', USA). MATERIAL AND METHODS: The study included 112 patients (77 males and 35 females)...
2017: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
https://www.readbyqxmd.com/read/28986691/spinal-motion-preservation-surgery-indications-and-applications
#11
REVIEW
Ioannis D Gelalis, Dimitrios V Papadopoulos, Dionysios K Giannoulis, Andreas G Tsantes, Anastasios V Korompilias
Fusion is one of the most commonly performed spinal procedures, indicated for a wide range of spinal problems. Elimination of motion though results in accelerated degeneration of the adjacent level, known as adjacent level disease. Motion preservation surgical methods were developed in order to overcome this complication. These methods include total disc replacement, laminoplasty, interspinous implants and dynamic posterior stabilization systems. The initial enthusiasm about these methods was followed by certain concerns about their clinical usefulness and their results...
October 6, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28723737/how-to-choose-when-implants-of-adjacent-height-both-fit-the-disc-space-properly-in-single-level-cervical-artificial-disc-replacement
#12
Xin Rong, Jigang Lou, Huibo Li, Yang Meng, Hao Liu
In cervical artificial disc replacement (C-ADR), sometimes we encountered with such cases that implants of adjacent height both fit the target disc space properly. No study was available discussing the choice of implant height and the clinical outcomes under such circumstance. The purpose of this study was to evaluate the impact of different implant heights on the clinical outcomes and radiographic results when the implants of adjacent height both fit the disc space properly. This retrospective study included 34 patients underwent single-level C-ADR at the C5-C6 level at our institution...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28525492/degenerative-cervical-disc-disease-long-term-changes-in-sagittal-alignment-and-their-clinical-implications-after-cervical-interbody-fusion-cage-subsidence-a-prospective-study-with-standalone-lordotic-tantalum-cages
#13
Félix Tomé-Bermejo, Julián A Morales-Valencia, Javier Moreno-Pérez, Juan Marfil-Pérez, Elena Díaz-Dominguez, Angel R Piñera, Luis Alvarez
STUDY DESIGN: A retrospective, observational study of prospectively collected outcomes. OBJECTIVE: To investigate the long-term clinical course of anterior cervical discectomy and fusion with interbody fusion cages (ACDF-IFC) with lordotic tantalum implants and to correlate the radiologic findings with the clinical outcomes, with special emphasis on the significance and the influence of implant subsidence. SUMMARY OF BACKGROUND DATA: Cage subsidence is the most frequently reported complication after ACDF-IFC...
June 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28506530/ipsilateral-proximal-and-shaft-femoral-fractures
#14
Eric Lawson, Soumaila Madougou, Pascal Chigblo, Gildas Quenum, Abdourahmane Ouangré, Fiacre Tidjani, Oswald Goukodadja, Aristote Hans-Moevi Akué
PURPOSE: To study the management and evaluate anatomical and functional outcomes of patients with ipsilateral proximal and shaft femoral fractures. METHODS: A retrospective, descriptive and analytic study lasted for ten years and a half ranging from January 1, 2005 to June 30, 2015. The following parameters were studied: epidemiology, fracture characteristics, therapeutic, anatomical and functional outcomes. The correlation between different parameters was analyzed with Fischer test...
June 2017: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/28382392/porous-silicon-nitride-spacers-versus-peek-cages-for-anterior-cervical-discectomy-and-fusion-clinical-and-radiological-results-of-a-single-blinded-randomized-controlled-trial
#15
Mark P Arts, Jasper F C Wolfs, Terry P Corbin
PURPOSE: Anterior cervical discectomy with fusion is a common procedure for treating radicular arm pain. Polyetheretherketone (PEEK) plastic is a frequently used material in cages for interbody fusion. Silicon nitride is a new alternative with desirable bone compatibility and imaging characteristics. The aim of the present study is to compare silicon nitride implants with PEEK cages filled with autograft harvested from osteophytes. METHODS: The study is a prospective, randomized, blinded study of 100 patients with 2 years follow-up...
April 5, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28198781/biomechanical-analysis-of-two-level-cervical-disc-replacement-with-a-stand-alone-u-shaped-disc-implant
#16
Yang Li, Guy R Fogel, Zhenhua Liao, Rajnesh Tyagi, Gaolong Zhang, Weiqiang Liu
STUDY DESIGN: Biomechanical study using a three-dimensional nonlinear finite element model. OBJECTIVE: To analyze biomechanical changes with three prostheses based on two-level arthroplasty and to verify the biomechanical efficiency of dynamic cervical implants (DCIs) with a stand-alone U-shaped structure. SUMMARY OF BACKGROUND DATA: Few studies have compared biomechanical behavior of various prostheses as they relate with clinical results after two-level total disc replacement...
October 15, 2017: Spine
https://www.readbyqxmd.com/read/27638075/bilateral-vestibulopathy
#17
REVIEW
M Strupp, K Feil, M Dieterich, T Brandt
The leading symptoms of bilateral vestibulopathy (BVP) are postural imbalance and unsteadiness of gait that worsens in darkness and on uneven ground. There are typically no symptoms while sitting or lying under static conditions. A minority of patients also have movement-induced oscillopsia, in particular while walking. The diagnosis of BVP is based on a bilaterally reduced or absent function of the vestibulo-ocular reflex (VOR). This deficit is diagnosed for the high-frequency range of the angular VOR by a bilaterally pathologic bedside head impulse test (HIT) and for the low-frequency range by a bilaterally reduced or absent caloric response...
2016: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27628910/simulation-of-multi-stage-nonlinear-bone-remodeling-induced-by-fixed-partial-dentures-of-different-configurations-a-comparative-clinical-and-numerical-study
#18
Zhipeng Liao, Nobuhiro Yoda, Junning Chen, Keke Zheng, Keiichi Sasaki, Michael V Swain, Qing Li
This paper aimed to develop a clinically validated bone remodeling algorithm by integrating bone's dynamic properties in a multi-stage fashion based on a four-year clinical follow-up of implant treatment. The configurational effects of fixed partial dentures (FPDs) were explored using a multi-stage remodeling rule. Three-dimensional real-time occlusal loads during maximum voluntary clenching were measured with a piezoelectric force transducer and were incorporated into a computerized tomography-based finite element mandibular model...
April 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27470956/-clinical-outcome-of-mid-term-follow-up-of-anterior-cervical-non-fusion-surgery-versus-anterior-cervical-discectomy-and-fusion-for-cervical-spondylosis
#19
L Guan, W L Wang, Y Hai, Y Z Liu, X L Chen, L Chen
OBJECTIVE: To evaluate the clinical and radiological outcomes of artificial cervical disc replacement (Prodisc-C), dynamic cervical implant and anterior cervical discectomy and fusion (ACDF) in the treatment of cervical spondylosis. METHOD: From May 2011 to May 2013, a total of 44 cervical spondylosis patients that received cervical disc arthroplasty (Prodisc-C), dynamic cervical implant (DCI) or ACDF were retrospectively reviewed in Orthopedics Department, Beijing Chaoyang Hospital, Capital Medical University...
July 5, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27197488/-influence-of-width-and-thickness-of-dci-s-curved-section-on-its-performance
#20
Jia Bai, Tao Wang, Xuejin Cheng, Lei Wu, Xiangjun Hu
By establishing a series of Dynamic Cervical Implants (DCI) within C5-C6 cervical spinal segments, the biomechanical finite element analysis for DCI with different width and thickness were carried out to investigate the influence of the width and thickness of DCI's curved section on its equivalent stress and range of motion (ROM), so as to provide some theoretical basis for the optimization of DCI's design. The results show that the width of DCI's curved section has more obvious influence on the ROM of lateral bending and torsion, in comparison with the thickness of DCI's curved section...
January 2016: Zhongguo Yi Liao Qi Xie za Zhi, Chinese Journal of Medical Instrumentation
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