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https://www.readbyqxmd.com/read/28734190/two-dimensional-modeling-of-elastic-wave-propagation-in-solids-containing-cracks-with-rough-surfaces-and-friction-part-ii-numerical-implementation
#1
Steven Delrue, Vladislav Aleshin, Kevin Truyaert, Olivier Bou Matar, Koen Van Den Abeele
Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code consists of two entities: the contact model and the solid mechanics module. Part I of the paper concerns an in-depth description of a constitutive model for realistic contacts or cracks that takes into account the roughness of the contact faces and the associated effects of friction and hysteresis...
July 13, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28721044/stimulated-phase-shift-acoustic-nanodroplets-enhance-vancomycin-efficacy-against-methicillin-resistant-staphylococcus-aureus-biofilms
#2
Hao Guo, Ziming Wang, Quanyin Du, Pan Li, Zhigang Wang, Aimin Wang
PURPOSE: Bacterial biofilms on the surface of prostheses are becoming a rising concern in managing prosthetic joint infections. The inherent resistant features of biofilms render traditional antimicrobial therapy unproductive and revision surgery outcomes uncertain. This situation has prompted the exploration of novel antimicrobial strategies. The synergy of ultrasound microbubbles and vancomycin has been proposed as an efficient alternative for biofilm eradication. The purpose of this study was to evaluate the anti-biofilm effect of stimulated phase-shift acoustic nanodroplets (NDs) combined with vancomycin...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28719993/comparison-of-treatment-results-for-mallet-finger-fractures-in-children-between-low-intensity-pulsed-ultrasound-stimulation-and-ishiguro-s-method
#3
Tsuyoshi Ota, Soichiro Itoh, Yoshihiko Matsuyama
BACKGROUND: We compared the treatment results for displaced mallet finger fractures in children between low-intensity pulsed ultrasound (LIPUS) stimulation and Ishiguro's method, which involves extension block and arthrodesis of the distal interphalangeal (DIP) joint with pinning. METHODS: Eleven cases (5 females and 6 males; average age, 13.5 years) of mallet finger were operated with Ishiguro's method, and 8 cases (3 females and 5 males; average age, 13.0 years) were treated with LIPUS stimulation...
March 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28719974/the-accuracy-of-common-hand-injections-with-and-without-ultrasound-an-anatomical-study
#4
Philip To, Kaylan N McClary, Micah K Sinclair, Brittany A Stout, Mohab Foad, Shannon Hiratzka, Peter J Stern
BACKGROUND: The aim of the study is to determine the accuracy of hand injections with and without the aid of ultrasound (U/S) into the carpal tunnel, thumb carpometacarpal (CMC) joint, first dorsal compartment (DC) and the radiocarpal (RC) joint. METHODS: Four participants of various level of experience injected the carpal tunnel, thumb CMC, first DC, and RC joint into 40 fresh frozen cadaver specimens with blue dye and radiographic contrast. Participants 1 and 2 were injected without U/S guidance, and participants 3 and 4 were injected with U/S guidance...
February 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28718441/is-intra-articular-steroid-injection-to-the-temporomandibular-joint-for-juvenile-idiopathic-arthritis-more-effective-and-efficient-when-performed-with-image-guidance
#5
Cory M Resnick, Pouya M Vakilian, Leonard B Kaban, Zachary S Peacock
PURPOSE: To compare short-term outcomes and procedure times for intra-articular steroid injection (IASI) to the temporomandibular joint (TMJ) with and without the use of intraoperative image guidance for patients with juvenile idiopathic arthritis (JIA). MATERIALS AND METHODS: This is a retrospective study of children with JIA who underwent TMJ IASI at Boston Children's Hospital (Boston, MA). Patients were divided into groups according to IASI technique: 1) "landmark" group if performed by an oral and maxillofacial surgeon using an anatomic landmark technique with no intraoperative image guidance or 2) "image-guided" group if performed by an interventional radiologist using intraoperative ultrasound and computed tomography...
April 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28717193/adhesive-capsulitis-of-the-shoulder-evaluation-with-us-arthrography-using-a-sonographic-contrast-agent
#6
Xueqing Cheng, Zhenqi Zhang, Guo Xuanyan, Tingting Li, Juan Li, Longlin Yin, Man Lu
Adhesive capsulitis (AC) is a painful and disabling disorder, which caused restricted motion and chronic pain of shoulder. Intracavitary contrast-enhanced ultrasound has been recently applied to assess obstructive bile duct diseases, tubal patency, vesicoureteric reflux and so on. The aim of this study was to detect the value of US-arthrography by injecting the contrast agent SonoVue into glenohumeral joint compared with US in diagnosing AC. Utrasound (US) and US-arthrography images of 45 patients with AC were compared with that of 45 control subjects without AC with MRI as a gold standard...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28706837/intraosseous-infiltration-of-platelet-rich-plasma-for-severe-hip-osteoarthritis
#7
Nicolás Fiz, Juan Carlos Pérez, Jorge Guadilla, Ane Garate, Pello Sánchez, Sabino Padilla, Diego Delgado, Mikel Sánchez
This work describes a technique of platelet-rich plasma (PRP) infiltration for the treatment of severe hip osteoarthritis (OA). Although the results achieved with intra-articular infiltrations of PRP are promising, they may be insufficient in the long-term for severe hip OA. The technique consists of a combined intra-articular and intraosseous infiltration of PRP to reach all joint tissues, especially the subchondral bone, and hence facilitate a greater distribution of PRP. Diagnosis is based on clinical and radiographic findings, and patients with grade III OA according to the Tönnis scale, as well as patients who have not responded to conventional treatment, are considered candidates for this technique...
June 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28693000/a-new-active-contours-approach-for-finger-extensor-tendon-segmentation-in-ultrasound-images-using-prior-knowledge-and-phase-symmetry
#8
Nelson Martins, Saad Sultan, Diana Veiga, Manuel Ferreira, Filipa Teixeira, Miguel Coimbra
This work proposes a new approach for the segmentation of the extensor tendon in ultrasound images of the second metacarpophalangeal joint (MCPJ). The MCPJ is known to be frequently involved in early stages of rheumatic diseases like rheumatoid arthritis. The early detection and follow up of these diseases is important to start and adapt the treatments properly and, in that way, preventing irreversible damage of the joints. This work relies on an active contours framework, preceded by a phase symmetry preprocessing and with prior knowledge energies, to automatically identify the extensor tendon...
July 5, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28692451/the-value-of-musculoskeletal-ultrasound-in-geriatric-care-and-rehabilitation
#9
Büşra Can, Murat Kara, Özgür Kara, Zekeriya Ülger, Walter Frontera, Levent Özçakar
The WHO reports that one of the major chronic conditions affecting the elderly worldwide is musculoskeletal disorders that are associated with long-term pain and disability. Considering the healthcare needs of the elderly (i.e. comprehensive, accessible, efficient) and the advantages of ultrasound (US) use (patient-friendly, convenient, cost-effective, and does not require exposure to radiation or magnetic fields), there seems to be a 'gap' in the actual clinical practice. In this paper, we aimed to highlight the potential value of US imaging in the management of the elderly with a wide spectrum of musculoskeletal conditions (degenerative/rheumatic joint diseases, falls/trauma, nursing care, peripheral nerve problems, sarcopenia, and interventions)...
July 7, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28690121/assessment-of-factors-that-could-affect-the-success-of-us-guided-contrast-injection-for-hip-mr-arthrography
#10
Yi-Chih Hsu, Yu-Cheng Wu, Kai-Hsiung Ko, Hsian-He Hsu, Guo-Shu Huang
BACKGROUND: To retrospectively evaluate the association between possible influencing factors and failed first attempts to inject a contrast agent intra-articularly under ultrasound (US)-guidance for direct magnetic resonance (MR) arthrography of the hip joint. METHODS: Ninety consecutive patients (38 women and 52 men; mean age, 42 years) undergoing US-guided hip MR arthrography (3 bilaterally) were retrospectively included in this study. The potential influencing factors were sex, age, body mass index (BMI), side of injection, target site, trajectory of the needle, additional use of needle tip rotation, failed first-attempt, and capsule elongation at the site of needle insertion...
July 6, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28685724/role-of-contrast-enhanced-ultrasound-in-the-evaluation-of-inflammatory-arthritis
#11
REVIEW
Chen-Yang Zhao, Yu-Xin Jiang, Jian-Chu Li, Zhong-Hui Xu, Qing Zhang, Na Su, Meng Yang
OBJECTIVE: Contrast-enhanced ultrasound (CEUS) is a well-established imaging modality which has been put into clinical use in recent years with the development of second-generation contrast agent and imaging devices, and its applications in the assessment of inflammatory arthritis, such as rheumatoid arthritis, psoriatic arthritis, and ankylosing spondylitis, have provoked abundant discussion and researches among radiologists and rheumatologists. To summarize the achievements of clinical studies on CEUS in the application of arthritis, and to keep up with the latest progresses of the imaging technique, we reviewed the literature in recent years, hoping to establish the role of CEUS in joint diseases...
July 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28681656/detection-of-synovial-inflammation-in-rheumatic-diseases-using-superb-microvascular-imaging-comparison-with-conventional-power-doppler-imaging
#12
Kazuhiro Yokota, Takuma Tsuzuki Wada, Yuji Akiyama, Toshihide Mimura
AIM: Superb microvascular imaging (SMI), a novel ultrasonography, is based on the sensitivity of Doppler technology. This study evaluated power Doppler (PD) ultrasound signals in patients with rheumatic disease using SMI and conventional PD imaging (cPDI) and compared the correlations of these signals to clinical assessments. METHODS: Thirty-nine patients with rheumatic disease (27 rheumatoid arthritis [RA] and 12 non-RA) were enrolled. We investigated SMI and cPDI signals in 26 joints using an Aplio 300...
July 6, 2017: Modern Rheumatology
https://www.readbyqxmd.com/read/28680900/semitendinosus-tendon-for-acl-reconstruction-regrowth-and-mechanical-property-recovery
#13
Stephen M Suydam, Daniel H Cortes, Michael J Axe, Lynn Snyder-Mackler, Thomas S Buchanan
BACKGROUND: Semitendinosus/gracilis (STG) tendon autograft has been used effectively for restoring knee stability after anterior cruciate ligament (ACL) rupture. Though ACL reconstruction with STG autograft is an effective surgical technique for return to sports, short-term hamstring strength asymmetries exist after surgery. Although imaging evidence has demonstrated regrowth and reorganization of the semitendinosus (ST) tendon, no studies show whether the regrowth is associated with residual muscle function...
June 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28670285/muscle-and-tendon-adaptation-in-adolescence-elite-volleyball-athletes-compared-to-untrained-boys-and-girls
#14
Falk Mersmann, Georgios Charcharis, Sebastian Bohm, Adamantios Arampatzis
Though the plasticity of human tendons is well explored in adults, it is still unknown how superimposed mechanical loading by means of athletic training affects the properties of tendons during maturation. Due to the increased responsiveness of muscle to mechanical loading, adolescence is an important phase to investigate the effects of training on the mechanical properties of tendons. Hence, in the present study we compared vastus lateralis (VL) architecture, muscle strength of the knee extensor muscles and patellar tendon mechanical properties of male and female adolescent elite athletes to untrained boys and girls...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28669429/hybrid-photoacoustic-ultrasound-tomograph-for-real-time-finger-imaging
#15
Milan Oeri, Wolfgang Bost, Nicolas Sénégond, Steffen Tretbar, Marc Fournelle
We report a target-enclosing, hybrid tomograph with a total of 768 elements based on capacitive micromachined ultrasound transducer technology and providing fast, high-resolution 2-D/3-D photoacoustic and ultrasound tomography tailored to finger imaging. A freely programmable ultrasound beamforming platform sampling data at 80 MHz was developed to realize plane wave transmission under multiple angles. A multiplexing unit enables the connection and control of a large number of elements. Fast image reconstruction is provided by GPU processing...
June 29, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28666051/multimodality-approach-to-a-stener-lesion-radiographic-ultrasound-magnetic-resonance-imaging-and-surgical-correlation
#16
Jonathan Tresley, Adam D Singer, Elizabeth A Ouellette, Jason Blaichman, Paul D Clifford
The ulnar collateral ligament (UCL) of the thumb metacarpophalangeal joint is a static stabilizer that may rupture from a hyperabduction injury. Although some UCL tears may heal with immobilization, outcomes are worse for Stener lesions, in which the proximal ligament stump slips out from beneath the adductor pollicis aponeurosis and is entrapped proximal and superficial to the aponeurosis, preventing primary healing. We report the case of a patient with a Stener lesion with radiographic, ultrasound, and magnetic resonance imaging correlation, subsequently confirmed with intraoperative photographs...
May 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28664186/highly-articulated-robotic-needle-achieves-distributed-ablation-of-liver-tissue
#17
Giada Gerboni, Joseph D Greer, Paul F Laeseke, Gloria L Hwang, Allison M Okamura
Robotic needle steering will improve percutaneous radio-frequency ablation (RFA) in the liver by performing distributed ablations without requiring multiple punctures of the liver capsule, thus enabling the treatment of large or multifocal tumors. However, state-of-the-art asymmetric-tip robotic needle steering systems do not yet achieve clinically relevant curvature. This work presents the design and development of a highly articulated needle that enables distributed RFA in liver tissue under ultrasound (US) image guidance...
July 2017: IEEE Robotics and Automation Letters
https://www.readbyqxmd.com/read/28661935/musculoskeletal-manifestations-of-systemic-lupus-erythmatosus
#18
Khaled Mahmoud, Ahmed Zayat, Edward M Vital
PURPOSE OF REVIEW: Imaging studies suggest potential changes to the classification and assessment of inflammatory musculoskeletal lupus. This is important because of the burden of disease but the potential for new targeted therapies. RECENT FINDINGS: Using our current classification and treatment, musculoskeletal symptoms continue to impact significantly on quality of life and work disability. Ultrasound and MRI studies suggested that new approaches to the diagnosis, classification, and evaluation of these symptoms are needed...
June 28, 2017: Current Opinion in Rheumatology
https://www.readbyqxmd.com/read/28660438/lower-material-stiffness-in-rupture-repaired-achilles-tendon-during-walking-transmission-mode-ultrasound-for-post-surgical-tendon-evaluation
#19
Mathias Wulf, Mihir Shanker, Michael Schuetz, Michael Lutz, Christian M Langton, Sue L Hooper, James E Smeathers, Torsten Brauner, Scott C Wearing
PURPOSE: This cross-sectional study used transmission-mode ultrasound to evaluate dynamic tendon properties during walking in surgically repaired and contralateral Achilles tendon (AT), with a median (range) post-operative period of 22 (4-58) months. It was hypothesised that the axial transmission speed of ultrasound (TSOU) during walking would be slower, indicating lower material stiffness in repaired compared with contralateral AT. METHODS: Ten patients [median (range) age 47 (37-69) years; height 180 (170-189) cm; weight 93 (62-119) kg], who had undergone open surgical repair of the AT and were clinically recovered according to their treating clinicians, walked barefoot on a treadmill at self-selected speed (1...
June 28, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28657932/the-influence-of-external-load-on-quadriceps-muscle-and-tendon-dynamics-during-jumping
#20
Jacob E Earp, Robert U Newton, Prue Cormie, Anthony J Blazevich
Tendons possess both viscous (rate-dependent) and elastic (rate-independent) properties that determine tendon function. During high-speed movements external loading increases both the magnitude (FT) and rate (RFDT) of tendon loading. PURPOSE: The influence of external loading on muscle and tendon dynamics during maximal vertical jumping was explored. METHODS: Ten resistance-trained men performed parallel-depth, countermovement vertical jumps with and without additional load (0%, 30%, 60% and 90% of maximum squat lift strength), while joint kinetics and kinematics, quadriceps tendon length (LT) and patellar tendon FT and RFDT were estimated using integrated ultrasound, motion analysis and force platform data and muscle-tendon modelling...
June 27, 2017: Medicine and Science in Sports and Exercise
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