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Andrew Pearle

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https://www.readbyqxmd.com/read/29244223/fixed-bearing-medial-unicompartmental-knee-arthroplasty-restores-neither-the-medial-pivoting-behavior-nor-the-ligament-forces-of-the-intact-knee-in-passive-flexion
#1
Mohammad Kia, Lucian C Warth, Joseph D Lipman, Timothy M Wright, Geoffrey H Westrich, Michael B Cross, David J Mayman, Andrew D Pearle, Carl W Imhauser
Medial unicompartmental knee arthroplasty (UKA) is an accepted treatment for isolated medial osteoarthritis. However, using an improper thickness for the tibial component may contribute to early failure of the prosthesis or disease progression in the unreplaced lateral compartment. Little is known of the effect of insert thickness on both knee kinematics and ligament forces. Therefore, a computational model of the tibiofemoral joint was used to determine how non-conforming, fixed bearing medial UKA affects tibiofemoral kinematics and tension in the medial collateral ligament (MCL) and the anterior cruciate ligament (ACL) during passive knee flexion...
December 15, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29228338/operative-nuances-of-stereotactic-leksell-frame-based-depth-electrode-implantation
#2
Holger Joswig, Carolyn M Benson, Andrew G Parrent, Keith W MacDougall, David A Steven
Background: For intracranial electroencephalographic monitoring, stereotactically implanted depth electrodes are increasingly used at epilepsy centers around the world. Objective: To identify pearls and pitfalls from our experience with stereotactic Leksell (Elekta AB, Stockhom, Sweden) frame-based depth electrode implantation. Methods: An intraoperative video of the implantation technique was recorded. Results: A detailed description and a video on how to implant depth electrodes using the stereotactic Leksell frame is provided...
December 7, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29185005/larger-range-of-motion-and-increased-return-to-activity-but-higher-revision-rates-following-unicompartmental-versus-total-knee-arthroplasty-in-patients-under-65-a-systematic-review
#3
REVIEW
Laura J Kleeblad, Jelle P van der List, Hendrik A Zuiderbaan, Andrew D Pearle
PURPOSE: Due to the lack of comparative studies, a systematic review was conducted to determine revision rates of unicompartmental and total knee arthroplasty (UKA and TKA), and compare functional outcomes, range of motion and activity scores in patients less than 65 years of age. METHODS: A literature search was performed using PubMed, Embase, and Cochrane systems since 2000. 27 UKA and 33 TKA studies were identified and included. Annual revision rate (ARR), functional outcomes, and return to activity were assessed for both types of arthroplasty using independent t tests...
November 28, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29149863/pearls-and-pitfalls-in-comprehensive-critical-care-echocardiography
#4
REVIEW
Sam Orde, Michel Slama, Andrew Hilton, Konstantin Yastrebov, Anthony McLean
Critical care echocardiography is developing rapidly with an increasing number of specialists now performing comprehensive studies using Doppler and other advanced techniques. However, this imaging can be challenging, interpretation is far from simple in the complex critically ill patient and mistakes can be easy to make. We aim to address clinically relevant areas where potential errors may occur and suggest methods to hopefully improve accuracy of imaging and interpretation.
November 17, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29149472/which-commonly-monitored-chemical-contaminant-in-the-bohai-region-yangtze-and-pearl-rivers-of-china-poses-the-greatest-threat-to-aquatic-wildlife
#5
Andrew C Johnson, Monika D Jürgens, Chao Su, Meng Zhang, Yueqing Zhang, Yajuan Shi, Andrew Sweetman, Xiaowei Jin, Yonglong Lu
This study assessed the relative risk of 29 chemical contaminants to aquatic wildlife in the Bohai Region, Yangtze and Pearl Rivers of China. River monitoring data from 2010-2015 for metals, pesticides, plasticisers, surfactants, poly-aromatic hydrocarbons, flame retardants and ammonia were collected. For each chemical, ecotoxicity data were compiled for Chinese relevant aquatic species. The chemicals were ranked by relative risk either by comparing the ratios of the median river concentration divided by the median ecotoxicity concentration or the percentage of river measurements which exceeded the lower 10(th) percentile ecotoxicity value...
November 17, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29131768/from-inguinal-hernias-to-spermatic-cord-lipomas-pearls-pitfalls-and-mimics-of-abdominal-and-pelvic-hernias
#6
Miguel C Cabarrus, Benjamin M Yeh, Andrew S Phelps, Jao J Ou, Spencer C Behr
Abdominal and pelvic hernias may be indolent and detected incidentally, manifest acutely with pain and distress, or cause chronic discomfort. Physical examination findings are often ambiguous and insufficient for optimal triage. Therefore, accurate anatomic delineation and identification of complications are critical for effective treatment planning. Imaging, particularly computed tomography, provides a vital understanding of the hernia's location and size, involved viscera, and severity of associated complications...
November 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29078961/new-parameters-describing-how-knee-ligaments-carry-force-in-situ-predict-interspecimen-variations-in-laxity-during-simulated-clinical-exams
#7
Carl W Imhauser, Robert N Kent, James Boorman-Padgett, Ran Thein, Thomas L Wickiewicz, Andrew D Pearle
Knee laxity, defined as the net translation or rotation of the tibia relative to the femur in a given direction in response to an applied load, is highly variable from person to person. High levels of knee laxity as assessed during routine clinical exams are associated with first-time ligament injury and graft reinjury following reconstruction. During laxity exams, ligaments carry force to resist the applied load; however, relationships between intersubject variations in knee laxity and variations in how ligaments carry force as the knee moves through its passive envelope of motion, which we refer to as ligament engagement, are not well established...
October 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29074321/predicting-the-feasibility-of-correcting-mechanical-axis-in-large-varus-deformities-with-unicompartmental-knee-arthroplasty
#8
Laura J Kleeblad, Jelle P van der List, Andrew D Pearle, Austin T Fragomen, S Robert Rozbruch
BACKGROUND: Due to disappointing historical outcomes of unicompartmental knee arthroplasty (UKA), Kozinn and Scott proposed strict selection criteria, including preoperative varus alignment of ≤15°, to improve the outcomes of UKA. No studies to date, however, have assessed the feasibility of correcting large preoperative varus deformities with UKA surgery. The study goals were therefore to (1) assess to what extent patients with large varus deformities could be corrected and (2) determine radiographic parameters to predict sufficient correction...
October 5, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29054315/cord-topographical-anatomy-and-its-role-in-evaluating-intramedullary-lesions
#9
REVIEW
James Andrew Spain, Scott Cressman, Horia Marin, Suresh C Patel, John J Corrigan, Brent Griffith
Intramedullary spinal lesions present a wide differential diagnosis including infectious, inflammatory, traumatic, ischemic, benign, or malignant neoplastic etiologies. Using knowledge of anatomy and physiology within the spinal cord, many similar appearing entities can be parsed into a prioritized differential. The purpose of this article is to review anatomy and pathophysiology of the spinal cord, with subsequent discussion of how this knowledge can be used to differentiate several similar appearing intramedullary pathologic processes...
September 18, 2017: Current Problems in Diagnostic Radiology
https://www.readbyqxmd.com/read/29049055/oxidized-regenerated-cellulose-collagen-dressings-review-of-evidence-and-recommendations
#10
Stephanie Wu, Andrew J Applewhite, Jeffrey Niezgoda, Robert Snyder, Jayesh Shah, Breda Cullen, Gregory Schultz, Janis Harrison, Rosemary Hill, Melania Howell, Marcus Speyrer, Howard Utra, Jean de Leon, Wayne Lee, Terry Treadwell
OBJECTIVE: Healthcare systems are being challenged to manage increasing numbers of nonhealing wounds. Wound dressings are one of the first lines of defense in wound management, and numerous options exist. The oxidized regenerated cellulose (ORC)/collagen dressing may offer healthcare providers a robust and cost-effective tool for use in a variety of wounds. DESIGN: A multidisciplinary panel meeting was convened to discuss the use of ORC/collagen dressings in wound care and provide practice recommendations...
November 2017: Advances in Skin & Wound Care
https://www.readbyqxmd.com/read/28983215/mid-term-outcomes-of-metal-backed-unicompartmental-knee-arthroplasty-show-superiority-to-all-polyethylene-unicompartmental-and-total-knee-arthroplasty
#11
Jelle P van der List, Laura J Kleeblad, Hendrik A Zuiderbaan, Andrew D Pearle
BACKGROUND: Two commonly used tibial designs for unicompartmental knee arthroplasty (UKA) are all-polyethylene "inlay" and metal-backed "onlay" components. Biomechanical studies showed that the metal baseplate in onlay designs better distributes forces over the tibia but studies failed to show differences in functional outcomes between both designs at mid-term follow-up. Furthermore, no studies have compared both designs with total knee arthroplasty (TKA). QUESTIONS/PURPOSES: The goal of this study was to compare outcomes of inlay UKA and onlay UKA at mid-term follow-up and compare these with TKA outcomes...
October 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28922347/pearl-millet-genome-sequence-provides-a-resource-to-improve-agronomic-traits-in-arid-environments
#12
Rajeev K Varshney, Chengcheng Shi, Mahendar Thudi, Cedric Mariac, Jason Wallace, Peng Qi, He Zhang, Yusheng Zhao, Xiyin Wang, Abhishek Rathore, Rakesh K Srivastava, Annapurna Chitikineni, Guangyi Fan, Prasad Bajaj, Somashekhar Punnuri, S K Gupta, Hao Wang, Yong Jiang, Marie Couderc, Mohan A V S K Katta, Dev R Paudel, K D Mungra, Wenbin Chen, Karen R Harris-Shultz, Vanika Garg, Neetin Desai, Dadakhalandar Doddamani, Ndjido Ardo Kane, Joann A Conner, Arindam Ghatak, Palak Chaturvedi, Sabarinath Subramaniam, Om Parkash Yadav, Cécile Berthouly-Salazar, Falalou Hamidou, Jianping Wang, Xinming Liang, Jérémy Clotault, Hari D Upadhyaya, Philippe Cubry, Bénédicte Rhoné, Mame Codou Gueye, Ramanjulu Sunkar, Christian Dupuy, Francesca Sparvoli, Shifeng Cheng, R S Mahala, Bharat Singh, Rattan S Yadav, Eric Lyons, Swapan K Datta, C Tom Hash, Katrien M Devos, Edward Buckler, Jeffrey L Bennetzen, Andrew H Paterson, Peggy Ozias-Akins, Stefania Grando, Jun Wang, Trilochan Mohapatra, Wolfram Weckwerth, Jochen C Reif, Xin Liu, Yves Vigouroux, Xun Xu
Pearl millet [Cenchrus americanus (L.) Morrone] is a staple food for more than 90 million farmers in arid and semi-arid regions of sub-Saharan Africa, India and South Asia. We report the ∼1.79 Gb draft whole genome sequence of reference genotype Tift 23D2B1-P1-P5, which contains an estimated 38,579 genes. We highlight the substantial enrichment for wax biosynthesis genes, which may contribute to heat and drought tolerance in this crop. We resequenced and analyzed 994 pearl millet lines, enabling insights into population structure, genetic diversity and domestication...
October 2017: Nature Biotechnology
https://www.readbyqxmd.com/read/28697861/regional-femoral-and-tibial-radiolucency-in-cemented-unicompartmental-knee-arthroplasty-and-the-relationship-to-functional-outcomes
#13
Laura J Kleeblad, Jelle P van der List, Hendrik A Zuiderbaan, Andrew D Pearle
BACKGROUND: Femoral and tibial radiolucent lines (RLL) after unicompartmental knee arthroplasty (UKA) can be categorized in physiological and pathological radiolucencies. Although physiological tibial radiolucency is assessed extensively in literature, studies reporting femoral radiolucency are lacking. Therefore, a retrospective study was performed to assess physiological femoral RLL and its relationship to short-term functional outcomes. METHODS: A total of 352 patients were included who underwent robotic-assisted medial UKA surgery and received a fixed-bearing metal-backed cemented medial UKA...
November 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28682711/-i-have-strong-hopes-for-the-future-time-orientations-and-resilience-among-canadian-indigenous-youth
#14
Andrew R Hatala, Tamara Pearl, Kelley Bird-Naytowhow, Andrew Judge, Erynne Sjoblom, Linda Liebenberg
In this article, we demonstrate how concepts of time and the future inform processes of resilience among Indigenous adolescents within an urban Canadian context. This study employed a modified grounded theory methodology by conducting 38 qualitative interviews with 28 Indigenous youth (ages 15-25) over the course of 1 year. The analysis revealed complex processes of and navigations between moments of distress and strategies for resilience. The distressing contexts in which Indigenous youth often find themselves can impact the development of their concepts of time and limit their abilities to conceptualize a future...
July 2017: Qualitative Health Research
https://www.readbyqxmd.com/read/28628728/characterizing-the-detection-threshold-for-optical-imaging-in-surgical-oncology
#15
Andrew C Prince, Aditi Jani, Melissa Korb, Kiranya E Tipirneni, Benjamin B Kasten, Eben L Rosenthal, Jason M Warram
BACKGROUND AND OBJECTIVES: Optical imaging to guide cancer resections is rapidly transitioning into the operating room. However, the sensitivity of this technique to detect subclinical disease is yet characterized. The purpose of this study was to determine the minimum range of cancer cells that can be detected by antibody-based fluorescence imaging. METHODS: 2LMP (breast), COLO-205 (colon), MiaPaca-2 (pancreas), and SCC-1 (head and neck) cells incubated in vitro with cetuximab-IRDye800CW (dose range 8...
June 19, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28601764/maternal-perchlorate-exposure-in-pregnancy-and-altered-birth-outcomes
#16
Rainbow Rubin, Michelle Pearl, Martin Kharrazi, Benjamin C Blount, Mark D Miller, Elizabeth N Pearce, Liza Valentin-Blasini, Gerald DeLorenze, Jane Liaw, Andrew N Hoofnagle, Craig Steinmaus
BACKGROUND: At high medicinal doses perchlorate is known to decrease the production of thyroid hormone, a critical factor for fetal development. In a large and uniquely exposed cohort of pregnant women, we recently identified associations between environmental perchlorate exposures and decreased maternal thyroid hormone during pregnancy. Here, we investigate whether perchlorate might be associated with birthweight or preterm birth in the offspring of these women. METHODS: Maternal urinary perchlorate, serum thyroid hormone concentrations, birthweight, gestational age, and urinary nitrate, thiocyanate, and iodide were collected in 1957 mother-infant pairs from San Diego County during 2000-2003, a period when the county's water supply was contaminated with perchlorate...
October 2017: Environmental Research
https://www.readbyqxmd.com/read/28592667/motorboat-noise-impacts-parental-behaviour-and-offspring-survival-in-a-reef-fish
#17
Sophie L Nedelec, Andrew N Radford, Leanne Pearl, Brendan Nedelec, Mark I McCormick, Mark G Meekan, Stephen D Simpson
Anthropogenic noise is a pollutant of international concern, with mounting evidence of disturbance and impacts on animal behaviour and physiology. However, empirical studies measuring survival consequences are rare. We use a field experiment to investigate how repeated motorboat-noise playback affects parental behaviour and offspring survival in the spiny chromis (Acanthochromis polyacanthus), a brooding coral reef fish. Repeated observations were made for 12 days at 38 natural nests with broods of young. Exposure to motorboat-noise playback compared to ambient-sound playback increased defensive acts, and reduced both feeding and offspring interactions by brood-guarding males...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28523513/erratum-to-high-interspecimen-variability-in-engagement-of-the-anterolateral-ligament-an-in-vitro-cadaveric-study
#18
Robert N Kent, James F Boorman-Padgett, Ran Thein, Jelle P van der List, Danyal H Nawabi, Thomas L Wickiewicz, Carl W Imhauser, Andrew D Pearle
No abstract text is available yet for this article.
October 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28477147/high-interspecimen-variability-in-engagement-of-the-anterolateral-ligament-an-in-vitro-cadaveric-study
#19
Robert N Kent, James F Boorman-Padgett, Ran Thein, Jelle P van der List, Danyal H Nawabi, Thomas L Wickiewicz, Carl W Imhauser, Andrew D Pearle
BACKGROUND: Anterolateral ligament (ALL) reconstruction as an adjunct to anterior cruciate ligament (ACL) reconstruction remains a subject of clinical debate. This uncertainty may be driven in part by a lack of knowledge regarding where, within the range of knee motion, the ALL begins to carry force (engages). QUESTIONS/PURPOSES: (1) Does the ALL engage in the ACL-intact knee; and (2) where within the range of anterior tibial translation occurring in the ACL-sectioned knee does the ALL engage? METHODS: A robotic manipulator was used to measure anterior tibial translation, ACL forces, and ALL forces in 10 fresh-frozen cadaveric knees (10 donors; mean age, 41 ± 16 years; range, 20-64 years; eight male) in response to applied multiplanar torques...
October 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28435507/blog-and-podcast-watch-orthopedic-emergencies
#20
Andrew Grock, Salim Rezaie, Anand Swaminathan, Alice Min, Kaushal H Shah, Michelle Lin
INTRODUCTION: The WestJEM Blog and Podcast Watch presents high quality open-access educational blogs and podcasts in emergency medicine (EM) based on the ongoing ALiEM Approved Instructional Resources (AIR) and AIR-Professional series. Both series critically appraise resources using an objective scoring rubric. This installment of the Blog and Podcast Watch highlights the topic of orthopedic emergencies from the AIR series. METHODS: The AIR series is a continuously building curriculum that follows the Council of Emergency Medicine Residency Directors (CORD) annual testing schedule...
April 2017: Western Journal of Emergency Medicine
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