keyword
MENU ▼
Read by QxMD icon Read
search

Artificial disc

keyword
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/29627599/improving-the-practicality-and-safety-of-artificial-corneas-pre-assembly-and-gamma-rays-sterilization-of-the-boston-keratoprosthesis
#2
Miguel Gonzalez-Andrades, Roholah Sharifi, Mohammad-Mirazul Islam, Thibaut Divoux, Michael Haist, Eleftherios Paschalis, Larisa Gelfand, Shamina Mamodaly, Luca Di Cecilia, Andrea Cruzat, Franz-Josef Ulm, James Chodosh, Francois Delori, Claes H Dohlman
PURPOSE: To make the Boston keratoprosthesis (B-KPro), together with its carrier corneal graft, more easily procured, transported and stored, as well as less expensive, easier for the surgeon to implant and safer for the patient, it is proposed that the B-KPro-graft combination be pre-assembled by an expert technician, followed by sterilization with gamma ray irradiation (GI) allowing long-term storage at room temperature. For this to be possible, it must be shown that the B-KPro itself (not only the graft) remains unharmed by the irradiation...
April 5, 2018: Ocular Surface
https://www.readbyqxmd.com/read/29627140/difference-in-the-fusion-rate-and-bone-formation-between-artificial-bone-and-iliac-autograft-inside-an-inter-body-fusion-cage-a-comparison-between-porous-hydroxyapatite-type-1-collagen-composite-and-autologous-iliac-bone
#3
Junichi Kushioka, Takashi Kaito, Takahiro Makino, Hiroyasu Fujiwara, Hiroyuki Tsukazaki, Shota Takenaka, Yusuke Sakai, Hideki Yoshikawa
BACKGROUND: Lateral inter-body fusion (LIF) using cages with a large bone grafting space can lead to a shortage of autologous grafting materials. The use of artificial bone is an option to increase the volume of grafting materials. However, the rate of bony fusion for these materials compared to that of autologous bone is unclear. METHODS: The bone fusion rate for artificial bone (HAp/Col) and autologous iliac bone (IBG) graft among 23 patients who had undergone LIF (total 66 disc levels) combined with multilevel posterior corrective fusion for the treatment of adult spinal deformity was retrospectively evaluated...
April 4, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/29605899/reoperation-and-complications-after-anterior-cervical-discectomy-and-fusion-and-cervical-disc-arthroplasty-a-study-of-52-395-cases
#4
Michael P Kelly, Claire D Eliasberg, Max S Riley, Remi M Ajiboye, Nelson F SooHoo
PURPOSE: The aim of this study was to analyze rates of perioperative complications and subsequent cervical surgeries in patients treated for cervical degenerative disc disease with anterior cervical discectomy and fusion (ACDF) and those treated with artificial cervical disc arthroplasty (ACDA) for up to 5-year follow-up. METHODS: California's Office of Statewide Health Planning and Development discharge database was analyzed for patients aged 18-65 years undergoing single-level ACDF or ACDA between 2003 and 2010...
March 31, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29595628/what-is-the-superior-surgical-strategy-for-bi-level-cervical-spondylosis-anterior-cervical-disc-replacement-or-anterior-cervical-decompression-and-fusion-a-meta-analysis-from-11-studies
#5
He Zhao, Li-Jun Duan, Yu-Shan Gao, Yong-Dong Yang, Xiang-Sheng Tang, Ding-Yan Zhao, Yang Xiong, Zhen-Guo Hu, Chuan-Hong Li, Xing Yu
BACKGROUND: Nowadays, anterior cervical artificial disc replacement (ACDR) has achieved favorable outcomes in treatment for patients with single-level cervical spondylosis. However, It is still controversial that whether or not it will become a potent therapeutic alternation in treating 2 contiguous levels cervical spondylosis compared with anterior cervical decompression and fusion (ACDF). Therefore, we conducted a systematic review and meta-analysis to compare the efficacy and safety of ACDR and ACDF in patients with 2 contiguous levels cervical spondylosis...
March 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29574279/study-on-biocompatibility-tribological-property-and-wear-debris-characterization-of-ultra-low-wear-polyethylene-as-artificial-joint-materials
#6
Yan-Yan Bian, Lei Zhou, Gang Zhou, Zhong-Min Jin, Shi-Xuan Xin, Zi-Kai Hua, Xi-Sheng Weng
Ultra-low-wear polyethylene (ULWPE) is a new type polyethylene made by experts who are from China petrochemical research institute, which is easy to process and implant. Preliminary test showed it was more resistant to wear than that of Ultra-high-molecular weight polyethylene (UHMWPE). The purpose of the research is to study biocompatibility, bio-tribological properties and debris characterization of ULWPE. Cytotoxicity test, hemolysis test, acute/chronic toxicity and muscular implantation test were conducted according to national standard GB/T-16886/ISO-10993 for evaluation requirements of medical surgical implants...
March 10, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29561227/biosynthesis-of-butyric-acid-by-clostridium-tyrobutyricum
#7
Jin Huang, Wan Tang, Shengquan Zhu, Meini Du
Butyric acid (C3 H7 COOH) is an important chemical that is widely used in foodstuffs along with in the chemical and pharmaceutical industries. The bioproduction of butyric acid via large-scale fermentation has the potential to be more economical and efficient than petrochemical synthesis. In this paper, the metabolic pathways involved in the production of butyric acid from Clostridium tyrobutyricum using hexose and pentose as substrates are investigated, and approaches to enhance butyric acid production via genetic modification are discussed...
March 21, 2018: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/29547169/endoscopic-partial-corpectomy-using-anterior-decompression-for-cervical-myelopathy
#8
Yad Ram Yadav, Shailendra Ratre, Vijay Parihar, Amitesh Dubey, Mashoo N Dubey
Symptomatic ventral cervical cord compressions have been treated by anterior discectomy with fusion, anterior corpectomy and fusion, discectomy with an artificial disc, and minimally invasive techniques. There are complications associated with the fusion procedure, especially when a long segment fusion is undertaken. Partial removal of the vertebral body without fusion could help in avoiding fusion and its associated complications. We are describing the detailed surgical technique, indications, limitations, and early results of endoscopic partially corpectomy...
March 2018: Neurology India
https://www.readbyqxmd.com/read/29538457/impact-of-non-thermal-plasma-surface-modification-on-porous-calcium-hydroxyapatite-ceramics-for-bone-regeneration
#9
Yu Moriguchi, Dae-Sung Lee, Ryota Chijimatsu, Khair Thamina, Kazuto Masuda, Dai Itsuki, Hideki Yoshikawa, Satoshi Hamaguchi, Akira Myoui
In the physiochemical sciences, plasma is used to describe an ionized gas. Previous studies have implicated plasma surface treatment in the enhancement of hydrophilicity of implanted musculoskeletal reconstructive materials. Hydroxyapatite (HA) ceramics, widely used in bone tissue regeneration, have made great advancements to skeletal surgery. In the present study, we investigate the impact of low-pressure plasma on the interconnected porous calcium hydroxyapatite (IP-CHA) both in vitro and in vivo. Our results indicate that dielectric barrier discharge (DBD) plasma, when used with oxygen, can augment the hydrophilicity of non-porous HA surfaces and the osteoconductivity of the IP-CHA disc via increased water penetration of inner porous structures, as demonstrated through microfocus computed tomography (μCT) assay...
2018: PloS One
https://www.readbyqxmd.com/read/29530742/reducing-the-risk-of-iatrogenic-cjd-by-improving-the-cleaning-of-neurosurgical-instruments
#10
Andrew Smith, Sandra Winter, David Lappin, Andrea Sherriff, Ian McIvor, Pamela Philp, Nigel Suttner, Sulisti Holmes, Alan Stewart
BACKGROUND: Currently UK vCJD cases total 178, with an estimated maximum 1:2,000 carriage rate based on archived appendix and tonsil tissue, implying infection maybe rare but carriage relatively common. Previous workers have identified that maintenance of surgical instruments in a humid atmosphere after use and prior to cleaning assists cleaning efficacy. Relatively recently the Department of Health/Advisory Committee on Dangerous Pathogens UK have recommended a surgical instrument cleanliness threshold post cleaning of <5μg protein per instrument side...
March 9, 2018: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29527778/translucency-of-zirconia-ceramics-before-and-after-artificial-aging
#11
Katarzyna Walczak, Heike Meißner, Ursula Range, Andreas Sakkas, Klaus Boening, Mieszko Wieckiewicz, Ioannis Konstantinidis
PURPOSE: The aging of zirconia ceramics (Y-TZP) is associated with tetragonal to monoclinic phase transformation. This change in microstructure may affect the optical properties of the ceramic. This study examines the effect of aging on the translucency of different zirconia materials. MATERIALS AND METHODS: 120 disc-shaped specimens were fabricated from four zirconia materials: Cercon ht white, BruxZir Solid Zirconia, Zenostar T0, Lava Plus (n = 30 per group). Accelerated aging was performed in a steam autoclave (134°C, 0...
March 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29462729/the-influence-of-artificial-cervical-disc-prosthesis-height-on-the-cervical-biomechanics-a-finite-element-study
#12
Wei Yuan, Haiping Zhang, Xiaoshu Zhou, Weidong Wu, Yue Zhu
OBJECTIVE: Artificial cervical disc replacement is expected to maintain normal cervical biomechanics. The effect of Prestige LP prosthesis height on cervical biomechanics has not been thoroughly studied yet. This finite element (FE) study of the cervical biomechanics aims to predict how the parameters like range of motion (ROM), adjacent intradiscal pressure, facet joint force and bone-implant interface stress are affected by different Prestige LP prosthesis heights. METHODS: The FE model of intact cervical spine (C3-C7) was obtained from our previous study, and the model was altered to implant Prestige LP prostheses at the C5-C6 level...
February 17, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29457442/-development-and-application-of-artificial-vertebral-body
#13
REVIEW
Jian-Tao Liu, Feng Zhang, Zheng-Chao Gao, Bin-Bin Niu, Yu-Huan Li, Xi-Jing He
Artificial vertebral body has achieved good results in treating spinal tumors, tuberculosis, fracture and other diseases. Currently, artificial vertebral body with variety of kinds and pros and cons, is generally divided into two types: fusion type and movable type. The former according to whether the height could be adjusted and strength of self-stability is divided into three types: support-fixed type, adjust-fixed type and self-fixed type. Whether the height of self-fixed type could be adjusted is dependent on structure of collar thread rotation...
December 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29456709/anterior-spinal-instrumentation-combining-a-prosthetic-disc-nucleus-with-a-flexible-stabilization-device-manufacture-and-use-in-intervertebral-disc-repair
#14
Da Bao, Dawei Li
Artificial disc replacement alone is unable to completely cure cervical degenerative diseases; thus, a stabilization device markedly improves patient recovery. In order to meet this requirement, an anterior spinal instrumentation combining a prosthetic disc nucleus with a flexible stabilization device (ASI combining PDN/FD) was developed. An artificial disc was designed and manufactured using polyvinyl alcohol hydrogel (PVA-H) with a repeated freeze-melting technique, and subsequently the dehydration and swelling properties of the PVA-H were investigated...
March 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29408574/clinical-and-radiological-features-of-three-reconstructive-procedures-for-the-surgical-management-of-patients-with-bi-level-cervical-degenerative-disc-disease-at-a-minimum-follow-up-period-of-five-years-a-comparative-study
#15
Kai-Feng Wang, Shuo Duan, Zhen-Qi Zhu, Hai-Ying Liu, Chen-Jun Liu, Shuai Xu
OBJECTIVE: To assess the mid-long-term follow-up of the safety and efficacy of anterior cervical discectomy and fusion (ACDF), cervical artificial disc replacement (CADR) and hybrid surgery (HS) for bi-level cervical degenerative disc disease (cDDD). METHODS: 77 patients who underwent ACDF, HS and CADR were retrospectively reviewed. Clinical effects were evaluated based on NDI, VAS and JOA scores, and the Odom criteria. Radiographic outcomes were evaluated, including cervical range of motion(ROM), operative and adjacent segments ROM, incidence of adjacent segments degeneration(ASD) and heterotopic ossification(HO)...
January 30, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29398208/histo-morphologic-characteristics-of-intra-osseous-implants-of-we43-mg-alloys-with-and-without-heat-treatment-in-an-in%C3%A2-vivo-cranial-bone-sheep-model
#16
Andrea Torroni, Chongchen Xiang, Lukasz Witek, Eduardo D Rodriguez, Roberto L Flores, Nikhil Gupta, Paulo G Coelho
WE43 Mg alloy, composed of Mg, Yttrium, Rare Earth elements, and Zirconium, has proved to be a suitable candidate for production of resorbable osteosynthesis implants in both clinical and experimental settings. In a previous study we tested biocompatibility and degradation properties of untreated (as-cast) and artificially aged (T-5) WE43 Mg-alloys as subperiosteal implants on a maxillofacial sheep model. Both the alloy compositions showed excellent biocompatibility, however, with respect to degradation rate, the as-cast form showed increased degradability compared with the T-5...
January 4, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29394530/breeding-system-and-bumblebee-drone-pollination-of-an-explosive-pollen-releasing-plant-meliosma-tenuis-sabiaceae
#17
Akira A Wong Sato, Makoto Kato
Explosive pollen release is a mechanism by some angiosperms that serves to attach pollen to a pollinator's body. It is usually adopted by species with zygomorphic tubular flowers and pollinated by birds and bees. The tree genus Meliosma (Sabiaceae, Proteales) has unique disc-like flowers that are externally actinomorphic, but internally zygomorphic, and release pollen explosively. To elucidate the adaptive significance of explosive pollen release, we observed flowering behavior, the breeding system, and pollinator visits to flowers of the Japanese species Meliosma tenuis in a temperate forest...
February 2, 2018: Plant Biology
https://www.readbyqxmd.com/read/29393833/myelopathy-after-cervical-disc-arthroplasty-due-to-progression-of-spondylosis-at-the-index-level-case-report
#18
Anita Bhansali, Michael Musacchio, Noam Stadlan
Cervical disc arthroplasty (CDA) has emerged as a popular alternative to anterior cervical discectomy and fusion (ACDF) for the surgical treatment of cervical degenerative disc disease. CDA has been well studied, with efficacy reported to be equivalent to or better than that seen with ACDF, and it is associated with a consistently low incidence of adverse events. The development or progression of myelopathy after CDA is a particularly rare occurrence. In this report, the authors describe the first known case of recurrence of myelopathy at the index level of surgery after CDA implantation due the continuation of the spondylitic process after placement of the artificial disc...
February 2, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29390319/the-influence-of-artificial-nucleus-pulposus-replacement-on-stress-distribution-in-the-cartilaginous-endplate-in-a-3-dimensional-finite-element-model-of-the-lumbar-intervertebral-disc
#19
Yu Wang, Xiao-Dong Yi, Chun-De Li
OBJECTIVE: This study aimed to investigate the effects involved with the artificial nucleus pulposus (NP) replacement on stress distribution of the cartilaginous endplate (CEP) in a 3-dimensional lumbar intervertebral disc (IVD) model using a finite element (FE) analysis. METHODS: A healthy male volunteer was recruited for the purposes of the study and a spiral computed tomography scan was subsequently conducted to obtain the data information in relation to the L4/5 motion segment...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29390151/high-co2-hypoxia-responsive-transcription-factor-network-involved-in-persimmon-fruit-deastringency
#20
Qing-Gang Zhu, Zi-Yuan Gong, Miao-Miao Wang, Xian Li, Donald Grierson, Xue-Ren Yin, Kun-Song Chen
Plant responses to anaerobic environments are regulated by ethylene response factors (ERFs) in both vegetative and productive organs, but the roles of other transcription factors (TFs) in hypoxia responses are poorly understood. Here, eight TFs (DkbHLH1, DkMYB9/10/11, DkRH2-1, DkGT3-1, DkAN1-1, DkHSF1) were shown to be strongly up-regulated by AHCA (artificial high CO2 atmosphere, 1 % O2 and 95 % CO2). Dual-luciferase assay indicated some TFs were activators of previously characterized DkERFs, including DkMYB10 for the DkERF9 promoter, DkERF18/19 and DkMYB6 for the DkERF19 promoter, DkERF21/22 for the DkERF10 promoter...
January 30, 2018: Journal of Experimental Botany
keyword
keyword
23799
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"