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Karim Sabeh, Milad Alam, Samuel Rosas, Shahrose Hussain, Michaela Schneiderbauer
INTRODUCTION: The growing trends of total knee arthroplasty (TKA) foreshadow an inevitable increase in the financial burden on healthcare expenditure estimated to almost nine billion dollars annually. This study aims to demonstrate the potential savings when using all-polyethylene (AP) compared to metal-backed (MB) tibial components and describes the cost variability amongst three major commercially available implants. MATERIALS AND METHODS: The cost of AP versus MB implants was analyzed using a large nationwide database, Emergency Care Research Institute (ECRI)...
March 12, 2018: Surgical Technology International
Y L Rodrigues, M T Mathew, L G Mercuri, J S P da Silva, B Henriques, J C M Souza
The aim of this study was to perform a literature review on the use of finite element modeling (FEM) for the evaluation of the biomechanical behavior of temporomandibular joint replacement (TMJR) devices. An electronic search of online medical and scientific literature database was conducted using selected search terms. The search identified 307 studies, of which 19 were considered relevant to this study. Of the 19 selected studies, 10 (52.6%) investigated the influence of geometry and fixation methods, while two (10...
March 8, 2018: International Journal of Oral and Maxillofacial Surgery
A V Benjamin, K Wailes-Newson, A Ma-Wyatt, D H Baker, A R Wade
Most of our knowledge about vision comes from experiments in which stimuli are presented to immobile human subjects or animals. In the case of human subjects, movement during psychophysical, electrophysiological or neuroimaging experiments is considered to be a source of noise to be eliminated. Animals used in visual neuroscience experiments are typically restrained and, in many cases, anaesthetized.In reality however, vision is often used to guide the motion of awake, ambulating organisms. Recent work in mice has shown that locomotion elevates visual neuronal response amplitudes (Erisken et al...
February 20, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Michael F Winchell, Naresh Pai, Benjamin H Brayden, Chris Stone, Paul Whatling, John P Hanzas, Jody J Stryker
The estimation of pesticide concentrations in surface water bodies is a critical component of the environmental risk assessment process required by regulatory agencies in North America, the European Union, and elsewhere. Pesticide transport to surface waters via deposition from off-field spray drift can be an important route of potential contamination. The spatial orientation of treated fields relative to receiving water bodies make prediction of off-target pesticide spray drift deposition and resulting aquatic estimated environmental concentrations (EECs) challenging at the watershed scale...
January 2018: Journal of Environmental Quality
Kellen Worhacz, Marc C Jacofsky, David J Jacofsky, Sarim Ahmed
Obesity is associated with increased surgical complications that may lead to suboptimal total knee arthroplasty (TKA) outcomes. Additionally, females exhibit increased rates of severe, clinical osteoarthritis OA, along with increased ligamentous laxity. Therefore, obese females present a particularly challenging case for TKA with increased joint loads coupled with a propensity for instability. This study retrospectively analyzed knee range of motion and stability of one TKA designs with two different degrees of polyethylene conformity in the obese female population...
January 22, 2018: Journal of Knee Surgery
Hila Otremski, Oleg Dolkart, Franck Atlan, Dan Hutt, Elad Segev, Tamir Pritsch, Yishai Rosenblatt
OBJECTIVES: Intraoperative hairline longitudinal fractures were recently reported in association with distal radius volar plating. Our aim was to further analyze this newly described complication. METHODS: A retrospective radiographic and chart review was performed on 225 patients who underwent distal radius plating between June 2013 and June 2015. The Acu-Loc/Acu-Loc2© plating system (Acumed, Hillsboro, OR, USA) was used in 208 cases, and the VariAx© plating system (Stryker, Kalamazoo, MI, USA) was used in 17 cases...
January 22, 2018: Skeletal Radiology
Hani M Rayess, Peter Svider, Curtis Hanba, Vivek Sagar Patel, Michael Carron, Giancarlo Zuliani
Importance: Facial implants represent an important strategy for providing instant and long-lasting volume enhancement to address both aging and posttraumatic defects. Objective: To better understand risks of facial implants by examining national resources encompassing adverse events and considerations facilitating associated litigation. Design, Setting, and Participants: A cross-sectional study reviewed complications following facial implants...
January 18, 2018: JAMA Facial Plastic Surgery
Fiachra E Rowan, Amanda Wach, Timothy M Wright, Douglas E Padgett
Mechanically assisted crevice corrosion (MACC) is a mechanism for trunnion damage in total hip arthroplasties (THAs). Retrieval studies have shown reduced MACC-related damage for ceramic heads compared with cobalt-chromium (CoCr) heads. We propose that ceramic heads demonstrate fretting at higher cyclic compressive loads than CoCr heads on titanium alloy trunnions in a simulated corrosion model. A closed electrochemical chamber was used to measure fretting current onset loads for two modern titanium alloy trunnions (Zimmer 12/14 and Stryker V-40) in which trunnion failure has been reported...
January 10, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Hazem A H Hosny, Ahmed El-Bakoury, Helmy Fekry, Jonathan Keenan
BACKGROUND: Several techniques have been described for management of severe acetabular bone defects during revision hip surgery including reconstructive cages. The purpose of this study is to analyze the survival and the mid-term clinical and radiological outcome using the Graft Augmentation Prosthesis (GAP II cage) (Stryker Orthopaedics, Mahwah, NJ) in addition to impaction grafting for acetabular defects in revision hip surgery. METHODS: This is a retrospective review of all patients who underwent acetabular revision hip replacement using GAP II cage and impaction bone grafting between 2009 and 2013 at our institution...
December 8, 2017: Journal of Arthroplasty
Benjamin G Domb, Sivashankar Chandrasekaran, Chengcheng Gui, Leslie C Yuen, Parth Lodhia, Carlos Suarez
The purpose of this study is to investigate whether robotic guidance in total hip arthroplasty (THA) can consistently correct native femoral version. One hundred seventy-five consecutive patients who underwent MAKO® (Stryker, Kalamazoo, Michigan) robotic-guidance THA were included in the study. The study population had a mean age of 57.9 years and a mean body mass index (BMI) of 30.41. Forty-eight percent of the population was male and 74% of the procedures were performed through an anterior approach. Robotic guidance in THA was effective in correcting native femoral version toward a target of 15°...
December 22, 2017: Surgical Technology International
Matthew A Butler, Aakash Chauhan, Gregory A Merrell, Jeffrey A Greenberg
Background: The present study aimed to determine anatomic references for the placement of five proximal humerus locking plates. Methods: Five proximal humerus locking-plate systems were placed on six human shoulder cadavers. Plates were positioned by fluoroscopic confirmation so that the inferior oblique screw was within 5 mm of the inferomedial cortex. Plate position was measured using the superior border of the pectoralis major tendon (PMT) to the bottom of the first slotted or nonlocking hole and top of the plate to the top of the greater tuberosity...
January 2018: Shoulder & Elbow
Adam J Miller, Jeffrey D Stimac, Langan S Smith, Anthony W Feher, Madhusudhan R Yakkanti, Arthur L Malkani
BACKGROUND: Although cemented total knee arthroplasty (TKA) continues to be the gold standard, there are patient populations with higher failure rates with cemented TKAs such as the obese, morbidly obese, and younger active males. Cementless TKA usage continues to increase because of the potential benefits of long-term biologic fixation similar to the rise in cementless total hip arthroplasty. The purpose of this study was to evaluate the clinical and radiographic results of cementless TKA using a novel highly porous cementless tibial baseplate...
December 2, 2017: Journal of Arthroplasty
Nathaniel T Kenton, Daniel Adu-Ampratwum, Antony A Okumu, Zhigao Zhang, Yong Chen, Son Nguyen, Jianyan Xu, Yue Ding, Pearse McCarron, Jane Kilcoyne, Frode Rise, Alistair L Wilkins, Christopher O Miles, Craig J Forsyth
A convergent and stereoselective total synthesis of the previously assigned structure of azaspiracid-3 has been achieved by a late-stage Nozaki-Hiyama-Kishi coupling to form the C21-C22 bond with the C20 configuration unambiguously established from l-(+)-tartaric acid. Postcoupling steps involved oxidation to an ynone, modified Stryker reduction of the alkyne, global deprotection, and oxidation of the resulting C1 primary alcohol to the carboxylic acid. The synthetic product matched naturally occurring azaspiracid-3 by mass spectrometry, but differed both chromatographically and spectroscopically...
January 15, 2018: Angewandte Chemie
Jorge López-Subías, Juan J Panisello, Jesús M Mateo-Agudo, Marina Lillo-Adán, Antonio Herrera
To establish the pattern of bone remodeling caused by a cementless, anatomic implant, we intend to evaluate the changes in bone mineral density observed after surgery in the Gruen zones. A controlled, prospective study was carried out, in which a group of 37 patients with primary coxarthrosis were densitrometrically analyzed over the 1 year period following the implant of an ANATO stem (Stryker). The patient's healthy hip was taken as the control. Any differences in the remodeling pattern were compared according to age, body mass index, and implant size...
September 28, 2017: Journal of Clinical Densitometry
E Bonicoli, N Piolanti, M Giuntoli, S Polloni, G Ciapini, P D Parchi, M Scaglione
A successful Total Knee Arthroplasty (TKA) requires stability, but rarely in primary TKA, a prosthesis with more constraint than a posterior-stabilizer (PS) is necessary. In patients with severe varus/valgus deformities with incompetent collateral ligaments or in knees that cannot be adequately balanced after ligaments release, a total-stabilizer (TS) prosthesis may be required. The purpose of our retrospective study is to evaluate clinical and radiographic outcomes at short mid-term follow-up in patients treated with a TS TKA...
October 2017: Journal of Biological Regulators and Homeostatic Agents
Huagang Yan, Fanqing Guo, Dengsong Zhu, Stefan Stryker, Sharron Trumpore, Kenneth Roberts, Susan Higgins, Ravinder Nath, Zhe Chen, Wu Liu
Special attention is required in planning and administering radiation therapy to patients with cardiac implantable electronic devices (CIEDs), such as pacemaker and defibrillator. The range of dose to CIEDs that can induce malfunction is large among CIEDs. Clinically significant defects have been reported at dose as low as 0.15 Gy. Therefore, accurate estimation of dose to CIED and dose reduction are both important even if the dose is expected to be less than the often-used 2-Gy limit. We investigated the use of bolus in in vivo dosimetry for CIEDs...
November 20, 2017: Journal of Applied Clinical Medical Physics
Leandro Jun Aihara, Rafael Augusto Nanni, Marina Sousa Carvalho, Caio Zamboni, Jorge R Durigan, José S Hungria Neto, Marcelo T Mercadante, Ralph W Christian, José O S Hungria
INTRODUCTION: This study measured the tip-apex distance (TAD) values in the immediate postoperative period and following weight-bearing and fracture impaction in patients undergoing osteosynthesis with dynamic hip screw and cephalomedullary nail. OBJECTIVE: To correlate the Baumgaertner index in the immediate postoperative period with values obtained after impaction of the fracture with the accommodation of the cephalic implant in the femoral head. PATIENTS AND METHODS: Radiographic TAD measurements were taken with AGFA-VIEW® of 82 patients with a mean age of 72 years with pertrochanteric fractures who were operated on and the fracture fixed with DHS- Synthes® , TFN-Synthes® , or Gamma Nail III-Stryker® in the immediate postoperative period, and following weight-bearing and fracture impaction (mean 3-8 weeks after surgery)...
October 2017: Injury
Mark Ruddy, David P FitzPatrick, Kenneth T Stanton
Impaction bone grafting is a method of restoring bone stock to patients who have suffered significant bone loss due to revision total hip surgery. The procedure requires morsellised cancellous bone (MCB) to be impacted into the site of bone loss in order to stabilise the prosthesis with the aim of long term resorption and reintegration of the impacted bone graft. Due to financial cost and the potential to transmit disease, the use of supplementary material, known as an extender, is frequently used to increase the graft material volume...
November 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Raul G Nogueira, Ashutosh P Jadhav, Diogo C Haussen, Alain Bonafe, Ronald F Budzik, Parita Bhuva, Dileep R Yavagal, Marc Ribo, Christophe Cognard, Ricardo A Hanel, Cathy A Sila, Ameer E Hassan, Monica Millan, Elad I Levy, Peter Mitchell, Michael Chen, Joey D English, Qaisar A Shah, Frank L Silver, Vitor M Pereira, Brijesh P Mehta, Blaise W Baxter, Michael G Abraham, Pedro Cardona, Erol Veznedaroglu, Frank R Hellinger, Lei Feng, Jawad F Kirmani, Demetrius K Lopes, Brian T Jankowitz, Michael R Frankel, Vincent Costalat, Nirav A Vora, Albert J Yoo, Amer M Malik, Anthony J Furlan, Marta Rubiera, Amin Aghaebrahim, Jean-Marc Olivot, Wondwossen G Tekle, Ryan Shields, Todd Graves, Roger J Lewis, Wade S Smith, David S Liebeskind, Jeffrey L Saver, Tudor G Jovin
Background The effect of endovascular thrombectomy that is performed more than 6 hours after the onset of ischemic stroke is uncertain. Patients with a clinical deficit that is disproportionately severe relative to the infarct volume may benefit from late thrombectomy. Methods We enrolled patients with occlusion of the intracranial internal carotid artery or proximal middle cerebral artery who had last been known to be well 6 to 24 hours earlier and who had a mismatch between the severity of the clinical deficit and the infarct volume, with mismatch criteria defined according to age (<80 years or ≥80 years)...
November 11, 2017: New England Journal of Medicine
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