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https://www.readbyqxmd.com/read/28625479/the-change-of-adjacent-segment-after-cervical-disc-arthroplasty-compared-with-anterior-cervical-discectomy-and-fusion-a-meta-analysis-of-randomized-controlled-trials
#1
REVIEW
Liang Dong, Zhengwei Xu, Xiujin Chen, Dongqi Wang, Dichen Li, Tuanjing Liu, Dingjun Hao
BACKGROUD CONTEXT: Many meta-analyses have been performed to study the efficacy of cervical disc arthroplasty (CDA) compared with anterior cervical discectomy and fusion (ACDF); however, there are few data referring to adjacent segment within these meta-analyses, or investigators are unable to arrive at the same conclusion in the few meta-analyses about adjacent segment. With the increased concerns surrounding adjacent segment degeneration (ASDeg) and adjacent segment disease (ASDis) after anterior cervical surgery, it is necessary to perform a comprehensive meta-analysis to analyze adjacent segment parameters...
June 15, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28622185/a-comprehensive-meta-analysis-of-the-adjacent-segment-parameters-in-cervical-disk-arthroplasty-versus-anterior-cervical-discectomy-and-fusion
#2
Liang Dong, Dongqi Wang, Xiujin Chen, Tuanjing Liu, Zhengwei Xu, Mingsheng Tan, Dingjun Hao
STUDY DESIGN: This is a meta-analysis of controlled trials. OBJECTIVE: To assess the overall condition of adjacent segment of cervical disk arthroplasty (CDA) compared with anterior cervical discectomy and fusion (ACDF). SUMMARY OF BACKGROUND DATA: With the increase in CDA and ACDF, surgeons are taking more attention to adjacent segment degeneration (ASDeg) and adjacent segment disease (ASDis). There are more and more meta-analyses comparing the efficacy of CDA with ACDF, however, there are few meta-analyses referring to adjacent segment parameters, and investigators are still unable to arrive at the same conclusion...
June 15, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28606581/the-effect-of-single-level-disc-degeneration-on-dynamic-response-of-the-whole-lumbar-spine-to-vertical-vibration
#3
Li-Xin Guo, Wei Fan
OBJECTIVE: The objective of this study was to investigate the effect of single-level disc degeneration on dynamic response of the whole lumbar spine to vertical whole body vibration that is typically present when driving vehicles. METHODS: Ligamentous finite element models of the lumbar L1-S1 motion segment in different grades of degeneration (healthy, mild and moderate) at L4-L5 level were developed with consideration of changing disc height and material properties of the nucleus pulpous...
June 9, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28604508/symptomatic-adjacent-segment-disease-after-anterior-cervical-discectomy-for-single-level-degenerative-disk-disease
#4
Roland D Donk, Wim I M Verhagen, Allard J F Hosman, Andre Verbeek, Ronald H M A Bartels
STUDY DESIGN: A prospective cohort of 142 patients underwent either anterior cervical discectomy alone, anterior cervical discectomy with fusion by cage stand-alone, or anterior cervical discectomy with arthroplasty. We then followed up on their condition for a mean of 9.1±1.9 years (5.6-12.2 y) later. OBJECTIVE: We aimed to evaluate the annual rate of clinically symptomatic adjacent segment disease (ASD) and to analyze predictive factors. SUMMARY OF BACKGROUND DATA: Until recent, ASD has been predominantly evaluated radiologically...
June 9, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28604488/anterior-cervical-discectomy-and-fusion-outcomes-over-10-years-a-prospective-study
#5
Glenn R Buttermann
STUDY DESIGN: Prospective cohort study with >10-year follow-up. OBJECTIVE: To assess the long-term, >10-year, clinical outcomes of anterior cervical discectomy and fusion (ACDF) and to compare outcomes based on primary diagnosis of disc herniation; stenosis or advanced degenerative disc disease (DDD); number of levels treated; and preexisting adjacent level degeneration. SUMMARY OF BACKGROUND DATA: ACDF is a proven treatment for patients with stenosis and disc herniation and results in significantly improved short- and intermediate-term outcomes...
June 9, 2017: Spine
https://www.readbyqxmd.com/read/28601219/the-importance-of-being-modified-the-role-of-rna-modifications-in-translational-fidelity
#6
Paul F Agris, Amithi Narendran, Kathryn Sarachan, Ville Y P Väre, Emily Eruysal
The posttranscriptional modifications of tRNA's anticodon stem and loop (ASL) domain represent a third level, a third code, to the accuracy and efficiency of translating mRNA codons into the correct amino acid sequence of proteins. Modifications of tRNA's ASL domain are enzymatically synthesized and site specifically located at the anticodon wobble position-34 and 3'-adjacent to the anticodon at position-37. Degeneracy of the 64 Universal Genetic Codes and the limitation in the number of tRNA species require some tRNAs to decode more than one codon...
2017: Enzymes
https://www.readbyqxmd.com/read/28598597/azapeptide-synthesis-methods-for-expanding-side-chain-diversity-for-biomedical-applications
#7
Ramesh Chingle, Caroline Proulx, William D Lubell
Mimicry of bioactive conformations is critical for peptide-based medicinal chemistry because such peptidomimetics may augment stability, enhance affinity, and increase specificity. Azapeptides are peptidomimetics in which the α-carbon(s) of one or more amino acid residues are substituted by nitrogen. The resulting semicarbazide analogues have been shown to reinforce β-turn conformation through the combination of lone pair-lone pair repulsion of the adjacent hydrazine nitrogen and urea planarity. Substitution of a semicarbazide for an amino amide residue in a peptide may retain biological activity and add benefits such as improved metabolic stability...
June 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28597366/finite-element-model-predicts-the-biomechanical-performance-of-cervical-disc-replacement-and-fusion-hybrid-surgery-with-various-geometry-of-ball-and-socket-artificial-disc
#8
Yang Li, Guy R Fogel, Zhenhua Liao, Weiqiang Liu
PURPOSE: Few finite element studies have investigated changes in cervical biomechanics with various prosthesis design parameters using hybrid surgery (HS), and none have investigated those combined different HS strategies. The aim of our study was to investigate the effect of ball-and-socket prosthesis geometry on the biomechanical performance of the cervical spine combined with two HS constructs. METHODS: Two HS strategies were conducted: (1) ACDF at C4-C5 and anterior cervical disc replacement (ACDR) at C5-C6 (ACDF/ACDR), and (2) ACDR/ACDF...
June 8, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28591077/progressive-bone-formation-after-cervical-disc-replacement-minimum-of-5-year-follow-up
#9
Feifei Zhou, Kevin L Ju, Yanbin Zhao, Fengshan Zhang, Shengfa Pan, John G Heller, Yu Sun
OBJECTIVE: Our objective was to examine the prevalence, clinical significance, ramifications, and possible etiology of postoperative bone formation at the index level after Cervical Disc Replacement (CDR) with a minimum of five years of follow-up. SUMMARY OF BACKGROUND DATA: CDR can be complicated by postoperative ossification and unwanted ankylosis at the index level, which some authors have termed "heterotopic ossification". This terminology may be inaccurate as it assumes the postoperative bone formation is unnatural and a consequence of the CDR surgery...
June 6, 2017: Spine
https://www.readbyqxmd.com/read/28590060/structure-function-relationships-at-the-human-spinal-disc-vertebra-interface
#10
Britta Berg-Johansen, Aaron J Fields, Ellen C Liebenberg, Alfred Li, Jeffrey C Lotz
Damage at the intervertebral disc-vertebra interface associates with back pain and disc herniation. However, the structural and biomechanical properties of the disc-vertebra interface remain underexplored. We sought to measure mechanical properties and failure mechanisms, quantify architectural features, and assess structure-function relationships at this vulnerable location. Vertebra-disc-vertebra specimens from human cadaver thoracic spines were scanned with micro-computed tomography (μCT), surface speckle-coated, and loaded to failure in uniaxial tension...
June 7, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28575461/adjacent-segment-degeneration-after-anterior-cervical-discectomy-and-fusion-with-an-autologous-iliac-crest-graft-a-magnetic-resonance-imaging-study-of-59-patients-with-a-mean-follow-up-of-27%C3%A2-yr
#11
Benedikt W Burkhardt, Andreas Simgen, Gudrun Wagenpfeil, Wolfgang Reith, Joachim M Oertel
BACKGROUND: Anterior cervical decompression and fusion (ACDF) is a widely accepted surgical technique for the treatment of degenerative disc disease. ACDF is associated with adjacent segment degeneration (ASD). OBJECTIVE: To assess whether physiological aging of the spine would overcome ASD by comparing adjacent to adjoining segments more than 18 yr after ACDF. METHODS: Magnetic resonance imaging of 59 (36 male, 23 female) patients who underwent ACDF was performed to assess degeneration...
May 30, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28575444/intrinsically-disordered-rgg-rg-domains-mediate-degenerate-specificity-in-rna-binding
#12
Bagdeser A Ozdilek, Valery F Thompson, Nasiha S Ahmed, Connor I White, Robert T Batey, Jacob C Schwartz
RGG/RG domains are the second most common RNA binding domain in the human genome, yet their RNA-binding properties remain poorly understood. Here, we report a detailed analysis of the RNA binding characteristics of intrinsically disordered RGG/RG domains from Fused in Sarcoma (FUS), FMRP and hnRNPU. For FUS, previous studies defined RNA binding as mediated by its well-folded domains; however, we show that RGG/RG domains are the primary mediators of binding. RGG/RG domains coupled to adjacent folded domains can achieve affinities approaching that of full-length FUS...
May 27, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28574978/adjacent-segment-degeneration-following-anterior-cervical-discectomy-and-fusion-versus-the-bryan-cervical-disc-arthroplasty
#13
Suo-Zhou Yan, Jun Di, Yong Shen
BACKGROUND Anterior cervical discectomy and fusion (ACDF) is an established treatment for degenerative disease of the cervical disc, but adjacent segment degeneration or instability may develop long term. The aim of this study was to investigate the risk factors for adjacent segment degeneration following ACDF compared with the use of the Bryan artificial disc for cervical disc arthroplasty (CDA). MATERIAL AND METHODS A prospective comparative study included 93 patients who underwent ACDF or CDA with the Bryan artificial cervical disc between 2002 and 2004, and who had more than eight years of follow-up...
June 2, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28562570/adjacent-segmental-degeneration-following-wallis-interspinous-stabilization-implantation-biomechanical-explanations-and-the-value-of-magnetic-resonance-imaging
#14
Zhiguo Zhou, Wei Xiong, Li Li, Feng Li
Adjacent segmental degeneration (ASD) is a major issue after pedicular fixation. This study examined the degeneration of the adjacent levels due to the insertion of the Wallis interspinous stabilization system compared with discectomy, using magnetic resonance imaging (MRI).Thirty-eight patients diagnosed with lumbar degeneration disorders at L4-L5 were reviewed: 19 patients underwent discectomy and Wallis system implantation (group A), and 19 patients underwent discectomy (group B). The Visual Analog Scale (VAS) and Oswestry Disability Index (ODI) were assessed preoperatively and postoperatively...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28559077/incidence-and-risk-factors-of-postoperative-adjacent-segment-degeneration-following-anterior-decompression-and-instrumented-fusion-for-degenerative-disorders-of-the-cervical-spine
#15
Hui Wang, Lei Ma, Dalong Yang, Sidong Yang, Wenyuan Ding
INTRODUCTION: The aim of this study was to explore the incidence and risk factors of postoperative adjacent segment degeneration following anterior decompression and instrumented fusion for degenerative disorders of the cervical spine, and hope to provide references in decision making and surgical planning for spinal surgeons. METHODS: By retrieving the medical records from January 2005 to September 2011, 283 patients were retrospectively reviewed. According to the occurrence of adjacent segment degeneration at follow up, patients were divided into two groups: ASD group and no ASD group...
May 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28557377/wet-amd-on-a-chip-modeling-outer-blood-retinal-barrier-in-vitro
#16
Minhwan Chung, Somin Lee, Byung Joo Lee, Kyungmin Son, Noo Li Jeon, Jeong Hun Kim
Choroidal neovascularization (CNV) in the retinal pigment epithelium (RPE)-choroid complex constituting outer blood retinal barrier (oBRB) is a critical pathological step in various ophthalmic diseases, which results in blindness, such as wet type age-related macula degeneration. Current in vitro experimental models using petri dishes or transwell are unable to study CNV morphogenesis. Here, a unique organotypic eye-on-a-chip model is described that mimics the RPE-choroid complex in vitro. This model consists of an RPE monolayer and adjacent perfusable blood vessel network, which is supporting barrier function of oBRB...
May 29, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28552835/effect-of-propionibacterium-acnes-pa-injection-on-intervertebral-disc-degeneration-in-a-rat-model-does-it-mimic-modic-changes
#17
Tomas Zamora, Joaquin Palma, Marcelo Andia, Patricia Garcia, Aniela Wozniak, Antonieta Solar, Mauricio Campos
INTRODUCTION: Multiple reports of bacterial isolates in human disc tissue have suggested a role of low-grade infection on intervertebral disc degeneration (IDD) and Modic Changes (MC) generation. Animal models have been extensively used to study IDD; however, until recently, no consideration had been given to eventual infectious processes. To reproduce the phenomena by inoculating an infecting agent would support the infectious hypothesis. Therefore, we studied the effect of Propionibacterium acnes (PA)inoculation on rat tails and determined whether it would produce MCs on the adjacent endplates...
May 25, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28534289/exposure-of-articular-chondrocytes-to-wear-particles-induces-phagocytosis-differential-inflammatory-gene-expression-and-reduced-proliferation
#18
Michael D Kurdziel, Meagan Salisbury, Lige Kaplan, Tristan Maerz, Kevin C Baker
The production of wear debris particulate remains a concern due to its association with implant failure through complex biologic interactions. In the setting of unicompartmental knee arthroplasty (UKA), damage and wear of the components may introduce debris particulate into the adjacent, otherwise, healthy compartment. The purpose of this study was to investigate the in vitro effect of polymeric and metallic wear debris particles on cell proliferation, extracellular matrix regulation, and phagocytosis index of normal human articular chondrocytes (nHACs)...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28525482/artificial-cervical-disk-replacement-for-the-treatment-of-adjacent-segment-disease-after-anterior-cervical-decompression-and-fusion
#19
Sheng Bin, Huang Xiangwang, Xiao Sheng, Xiang Tiecheng, Liu Xiangyang, Zhang Yi, Liu Bin
STUDY DESIGN: Retrospective study. OBJECTIVE: To evaluate the outcome of artificial cervical disk replacement (ACDR) for the treatment of adjacent segment disease (ASD) after anterior cervical decompression and fusion (ACDF). SUMMARY OF BACKGROUND DATA: ACDF is the useful procedure for degenerative cervical diseases. However, studies have reported accelerated degeneration of functional spinal units adjacent to the fusion site after ACDF. MATERIALS AND METHODS: Between January 2004 and January 2011, 32 inpatients (18 male, 14 female; age, 38-61 y; mean, 48 y) underwent ACDR for the treatment of ASD after previous ACDF (single-level: n=12; 2-level: n=15; 3-level: n=5)...
June 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28525481/comparison-of-the-clinical-and-radiographic-results-between-cervical-artificial-disk-replacement-and-anterior-cervical-fusion-a-6-year-prospective-nonrandomized-comparative-study
#20
Wei Tian, Kai Yan, Xiao Han, Jie Yu, Peihao Jin, Xiaoguang Han
STUDY DESIGN: Prospective nonrandomized comparative study. OBJECTIVE: To compare the long-term clinical and radiographic results of cervical artificial disk replacement (CADR) and anterior cervical discectomy and fusion (ACDF), and to provide our evidence if CADR could reduce adjacent segment degeneration (ASD). SUMMARY OF BACKGROUND DATA: CADR is widely used in spine surgery today. Despite the short-term results of it having been ascertained, the long-term results are still under observation...
June 2017: Clinical Spine Surgery
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