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https://www.readbyqxmd.com/read/29473877/parameter-estimation-of-the-thermal-network-model-of-a-machine-tool-spindle-by-self-made-bluetooth-temperature-sensor-module
#1
Yuan-Chieh Lo, Yuh-Chung Hu, Pei-Zen Chang
Thermal characteristic analysis is essential for machine tool spindles because sudden failures may occur due to unexpected thermal issue. This article presents a lumped-parameter Thermal Network Model (TNM) and its parameter estimation scheme, including hardware and software, in order to characterize both the steady-state and transient thermal behavior of machine tool spindles. For the hardware, the authors develop a Bluetooth Temperature Sensor Module (BTSM) which accompanying with three types of temperature-sensing probes (magnetic, screw, and probe)...
February 23, 2018: Sensors
https://www.readbyqxmd.com/read/29473011/use-of-3d-navigation-in-subaxial-cervical-spine-lateral-mass-screw-insertion
#2
Abdullah Arab, Fahad Alkherayf, Adam Sachs, Eugene K Wai
Objective  Cervical spine can be stabilized by different techniques. One of the common techniques used is the lateral mass screws (LMSs), which can be inserted either by freehand techniques or three-dimensional (3D) navigation system. The purpose of this study is to evaluate the difference between the 3D navigation system and the freehand technique for cervical spine LMS placement in terms of complications. Including intraoperative complications (vertebral artery injury [VAI], nerve root injury [NRI], spinal cord injury [SCI], lateral mass fracture [LMF]) and postoperative complications (screw malposition, screw complications)...
January 2018: Journal of Neurological Surgery Reports
https://www.readbyqxmd.com/read/29472168/stability-of-locking-plate-and-compression-screws-for-lapidus-arthrodesis-a-biomechanical-comparison-of-plate-position
#3
David Drummond, Travis Motley, Victor Kosmopoulos, Jordan Ernst
Lapidus (first tarsometatarsal joint) arthrodesis is an established and widely used procedure for the management of moderate to severe hallux valgus, especially in cases involving hypermobility of the first tarsometatarsal joint. Multiple fixation methods are available, and several previous investigations have studied the relative strengths of these methods, including dorsomedial and plantar plating comparisons. However, these studies compared plates of varying designs and mechanical properties and used varying modes of compression and interfragmentary screw techniques...
February 19, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29471558/indication-technique-and-long-term-results-after-shoulder-arthrodesis-performed-with-plate-fixation
#4
Ulrich Irlenbusch, Olaf Rott, Lars Irlenbusch
AIM: Arthrodesis of the shoulder joint is a radical event, so it is difficult to explain its significance to patients. It has been the last resort in hopeless cases. Knowledge of long-term results and evaluation of advantages and disadvantages seems to be helpful in this regard. METHODS: Eleven patients with mean age of 45 (31 - 58) years were operated between 2000 and 2013. All patients could be included in the investigation (FU mean 8.5 [3 - 16] years; 8 male and 3 female; right 9, left 2)...
February 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29471156/sliding-hip-screw-versus-cannulated-cancellous-screws-for-fixation-of-femoral-neck-fracture-in-adults-a-systematic-review
#5
REVIEW
Jian-Xiong Ma, Ming-Jie Kuang, Fei Xing, Yun-Long Zhao, Heng-Ting Chen, Lu-Kai Zhang, Zheng-Rui Fan, Chao Han, Xin-Long Ma
OBJECTIVE: Femoral neck fracture is considered a difficult fracture to treat and often gives rise to unsatisfactory treatment results. Cannulated cancellous screws (CCS) or a sliding hip screw (SHS) are the mainstream internal fixations used for osteosynthesis of femoral neck fractures. There is a need to integrate existing data through a meta-analysis to investigate the safety and effectiveness of CCS and SHS in the treatment of femoral neck fractures. METHOD: According to the Cochrane Handbook for Systematic Reviews of Interventions, we screened for the relevant studies by searching Google Scholar, the Cochrane Controlled Trials Register, the Cochrane Library, Web of Science, EMBASE, and PubMed...
February 19, 2018: International Journal of Surgery
https://www.readbyqxmd.com/read/29470278/pullout-strength-of-pedicle-screws-following-redirection-after-lateral-or-medial-wall-breach
#6
Toru Maeda, Kosaku Higashino, Hiroaki Manabe, Kazuta Yamashita, Fumio Hayashi, Yuichiro Goda, Yoshihiro Tsuruo, Koichi Sairyo
STUDY DESIGN: A cadaveric biomechanical study designed to test the pullout strength of pedicle screws. OBJECTIVE: To evaluate the pullout strength of redirected pedicle screws with a larger diameter following lateral wall breach, redirected pedicle screws of the same diameter following medial wall breach, and redirected pedicle screws with a larger diameter following medial wall breach. SUMMARY OF BACKGROUND DATA: Screw malposition is one of the main pitfalls of inserting pedicle screws...
February 21, 2018: Spine
https://www.readbyqxmd.com/read/29470056/dynamics-and-removal-pathway-of-edge-dislocations-in-imperfectly-attached-pbte-nanocrystal-pairs-towards-design-rules-for-oriented-attachment
#7
Justin C Ondry, Matthew R Hauwiller, A Paul Alivisatos
Using in-situ high resolution TEM, we study the structure and dynamics of well-defined edge dislocations in imperfectly attached PbTe nanocrystals. We identify that attachment of PbTe nanocrystals on both {100} and {110} facets give rise to b=a/2<110> edge dislocations. Based on the Burgers vector of individual dislocations, we can identify the glide plane of the dislocations. We observe that defects in particles attached on {100} facets have glide planes that quickly intersect the surface, and HRTEM movies show that the defects follow the glide plane to the surface...
February 22, 2018: ACS Nano
https://www.readbyqxmd.com/read/29468440/incidence-and-clinical-relevance-of-cage-subsidence-in-anterior-cervical-discectomy-and-fusion-a-systematic-review
#8
REVIEW
Iris Noordhoek, Marvyn T Koning, Wilco C H Jacobs, Carmen L A Vleggeert-Lankamp
BACKGROUND: The placement of intervertebral cages in anterior cervical discectomy (ACDF) supposedly maintains foraminal height. The most commonly reported cage-related complication is subsidence, although it is unknown whether a correlation between subsidence and clinical outcome exists. AIM: To assess the incidence and relevance of subsidence. METHODS: Literature searches were performed in PubMed, MEDLINE, Embase, Web of Science, COCHRANE, and CENTRAL...
February 21, 2018: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29466679/a-biomechanical-comparison-of-fifth-metatarsal-jones-fracture-fixation-methods
#9
Neil L Duplantier, Ronald J Mitchell, Steve Zambrano, Aaron C Stone, Domenica A Delgado, Bradley S Lambert, Michael R Moreno, Joshua D Harris, Patrick C McCulloch, David M Lintner, Kevin E Varner
BACKGROUND: Fifth metatarsal base fractures of the metaphyseal-diaphyseal watershed junction (Jones fracture) are commonly treated with surgical fixation in athletes. Intramedullary screw fixation remains the most utilized construct, although plantar-lateral plating is an alternative. Purpose/Hypothesis: The purpose was to compare the mechanical strength of fracture fixation between an intramedullary screw and plantar-lateral plating. The hypothesis was that plantar-lateral plate fixation would allow for more cycles and higher peak loads before failure, as well as less fracture gapping, than would an intramedullary screw in cadaveric foot specimens with simulated Jones fractures exposed to cantilever bending...
February 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29465847/dysphagia-in-the-elderly-following-anterior-cervical-surgery-a-multidisciplinary-approach
#10
C N Osuafor, B Smith, N El-Kininy, C Donegan
Dysphagia is a risk factor for adverse health outcomes like aspiration, recurrent chest infections and malnutrition. Here, we describe a case of an 82-year-old lady who presented with a two-month history of dysphagia after an anterior odontoid screw fixation for a type II odontoid process fracture. This case highlights the importance of a multidisciplinary approach to patient care.
December 18, 2017: Irish Medical Journal
https://www.readbyqxmd.com/read/29465075/-resorbable-vs-nonresorbable-fixation-in-alveolar-bone-grafting-in-unilateral-cleft-lip-and-palate-patients
#11
A L Ivanov, E I Reshetnyak, N V Starikova, N V Udalova, A G Nadtochy
The aim of the study was to evaluate the resorbable vs nonresorbable fixation efficiency in bone grafting for unilateral cleft lip and palate (UCLP) patients. Thirty eight UCLP patients aged from 7 to 17 years (mean 11.5±3.1 years) were divided in two groups with different types of cortical graft fixation: group 1 ─ titanium screws (22 patients), group 2 ─ resorbable pins (16 patients). The Bergland and Chelsea scales were used to evaluate the outcomes 8 months after surgery. Additional authors' original scales were introduced: bone volume scale and pyriform rim restoration scale...
2018: Stomatologii︠a︡
https://www.readbyqxmd.com/read/29464295/-evolution-and-principles-of-intramedullary-locked-nailing
#12
C Hierholzer, J Friederichs, P Augat, A Woltmann, O Trapp, V Bühren, C von Rüden
Key factors for successful osteosynthetic fracture stabilization are anatomical fracture reduction, restoration of axis and torsion alignment as well as tissue-preserving operative techniques. In long bone fractures, the use of intramedullary long bridging nailing offers ideal conditions for bone healing, as axial and rotational stability is provided by canal-filling nails and locking screws. In addition, the tissue in the fracture region is protected as the intramedullary nail insertion is distant from the fracture...
February 20, 2018: Der Unfallchirurg
https://www.readbyqxmd.com/read/29463783/comparison-of-percutaneous-kyphoplasty-and-bone-cement-augmented-short-segment-pedicle-screw-fixation-for-management-of-k%C3%A3-mmell-disease
#13
Yan-Sheng Huang, Ding-Jun Hao, Hang Feng, Hai-Ping Zhang, Si-Min He, Chao-Yuan Ge, Xing-Bang Niu
BACKGROUND The purpose of this study was to compare the efficacy of percutaneous kyphoplasty (PKP) and bone cement-augmented short segmental fixation (BCA+SSF) for treating Kümmell disease. MATERIAL AND METHODS Between June 2013 and December 2015, 60 patients were treated with PKP or BCA+SSF. All patients were followed up for 12-36 months. We retrospectively reviewed outcomes, including Oswestry Disability Index (ODI), visual analogue scale (VAS), and kyphotic Cobb angle. RESULTS VAS, ODI, and Cobb angle, measured postoperatively and at the final follow-up, were lower than those measured preoperatively in both groups (P<0...
February 21, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29463458/surgical-treatment-by-percutaneous-anterior-screw-fixation-of-scaphoid-fractures
#14
A Marzouki, B Soumare, A S Diarra, K Lahrach, F Boutayeb
The aim of this study was to evaluate the results of percutaneous screw fixation of scaphoid waist fractures in our surgery unit by comparing them with recent data from the literature. This was a retrospective, descriptive study conducted between January 2010 and September 2016. Patients operated due to a recent scaphoid fracture and treated by percutaneous anterograde screw fixation with a Herbert screw were included in this study. Our cohort was a sub-set from a scaphoid fracture group; other fracture sites, other treatment techniques and fractures associated with scapholunate ligament lesions were excluded...
February 17, 2018: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/29463278/clinical-and-radiological-effect-of-medialized-cortical-bone-trajectory-for-lumbar-pedicle-screw-fixation-in-patients-with-degenerative-lumbar-spondylolisthesis-study-protocol-for-a-randomized-controlled-trial-mpact
#15
Anja Tschugg, Pujan Kavakebi, Sebastian Hartmann, Sara Lener, Christoph Wipplinger, Wolfgang N Löscher, Sabrina Neururer, Matthias Wildauer, Claudius Thomé
BACKGROUND: Spinal fusion with pedicle screw fixation represents the gold standard for lumbar degenerative disc disease with instability. Although it is an established technique, it is nevertheless an invasive intervention with high complication rates. Therefore, minimally invasive approaches have been developed, the medialized bilateral screw pedicel fixation (mPACT) being one of them. The study objective is to evaluate prospectively the efficacy and safety of the mPACT technique compared with the traditional trajectory for degenerative lumbar spondylolisthesis...
February 20, 2018: Trials
https://www.readbyqxmd.com/read/29462734/divergent-bilateral-plif-with-cortical-screw-fixation-description-of-new-trajectory-for-interbody-technique-from-midline-exposure
#16
Michael A Bohl, Randy J Hlubek, U Kumar Kakarla, Steve W Chang
BACKGROUND: A major drawback to the use of cortical bone trajectory pedicle screws (CBTPS) with traditional posterior lumbar interbody fusion (PLIF) and transforaminal lumbar interbody fusion (TLIF) grafts is that traditional graft insertion trajectories require a wider posterior exposure. This wider exposure, beyond the limits otherwise required for CBTPS placement, negates a primary benefit of CBTPS fixation. OBJECTIVE: To define an alternative surgical technique for interbody graft placement that, when used in conjunction with CBTPS fixation, permits both minimal soft tissue dissection and optimal graft placement...
February 17, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29462730/biomechanical-stability-afforded-by-unilateral-vs-bilateral-pedicle-screw-fixation-with-and-without-interbody-support-using-lateral-lumbar-interbody-fusion
#17
Jakub Godzik, Eduardo Martinez-Del-Campo, Anna G U S Newcomb, Marco T Reis, Luis Perez-Orribo, Alexander C Whiting, Vaneet Singh, Brian P Kelly, Neil R Crawford
OBJECTIVE: To determine the stability of fusion constructs with unilateral pedicle screw (UPS) or bilateral pedicle screw (BPS) fixation with and without an interbody implant using the lateral lumbar interbody (LLIF) approach. METHODS: Standard nondestructive flexibility tests were performed on 13 cadaveric lumbar specimens to assess spinal stability of intact specimens and 5 configurations of posterior and interbody instrumentation. Spinal stability was determined as mean range of motion in flexion-extension, lateral bending, and axial rotation...
February 17, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29462447/radiographic-and-neurological-outcome-after-surgical-treatment-of-traumatic-fractures-of-the-ankylotic-thoracic-spine-a-retrospective-case-series
#18
Alexander B Dru, Paul S Kubilis, Gregory A Murad, Tyler Carney, Daniel J Hoh
BACKGROUND: Spontaneous thoracic ankylosis is a progressive degenerative process that predisposes patients to potentially highly unstable traumatic injuries. Acute hyperextension fractures result in dynamic instability putting the spinal cord at risk. OBJECTIVE: To describe preoperative radiographic characteristics of fractures of the ankylotic thoracic spine and relate findings to early postoperative radiographic and clinical outcomes. METHODS: A single center, retrospective review was performed of 28 surgically treated patients with fractures of the ankylotic thoracic spine...
March 1, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29462070/bisphosphonate-and-teriparatide-use-in-thoracolumbar-spinal-fusion-a-systematic-review-and-meta-analysis-of-comparative-studies
#19
Rafael A Buerba, Akshay Sharma, Chason Ziino, Alexander Arzeno, Remi M Ajiboye
STUDY DESIGN: Systematic review and meta-analysis. OBJECTIVE: To compare the efficacy of the use of either bisphosphonates or teriparatide on radiographic and functional outcomes of patients that had thoracolumbar spinal fusion. SUMMARY OF BACKGROUND DATA: Controversy exists as to whether bisphosphonates interfere with successful spinal arthrodesis. An alternative osteoporosis medication is teriparatide, a synthetic parathyroid hormone that has an anabolic effect on osteoblast function...
February 16, 2018: Spine
https://www.readbyqxmd.com/read/29462065/biomechanical-comparison-of-four-different-atlantoaxial-posterior-fixation-constructs-in-adults-a-finite-element-study
#20
Dong Hyun Chun, Do Heum Yoon, Keung Nyun Kim, Seong Yi, Dong Ah Shin, Yoon Ha
STUDY DESIGN: Finite element analysis. OBJECTIVE: To compare the biomechanical stability imparted to the C1 and C2 vertebrae by the transarticular(TA), C1 lateral mass(LM)-C2 pedicle(PS), C1LM-C2 pars, and C1LM-C2 translaminar screw(TL) fixation techniques. SUMMARY OF BACKGROUND DATA: Cadaveric biomechanical studies of several atlantoaxial posterior fixation techniques have been performed, showing significant heterogeneity in biomechanical properties among the studies...
February 16, 2018: Spine
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