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muscle elastography

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https://www.readbyqxmd.com/read/29147849/heterogeneity-of-passive-elastic-properties-within-the-quadriceps-femoris-muscle-tendon-unit
#1
Brooke K Coombes, Brandon Ziegenfuss, Michael David, Rohitha Badya, Wolbert van den Hoorn, François Hug, Kylie Tucker
PURPOSE: The purpose of this study was to compare regional elastic properties between anterior and posterior regions of the patellar tendon, and individual quadriceps muscles, over a range of knee flexion angles. METHODS: An isokinetic dynamometer passively positioned the non-dominant knee of 19 young, healthy participants, at 25°, 40°, 55°, 70° and 85° flexion. Shear wave velocity (SWV, an index of tissue elasticity) was measured using ultrasound shear wave elastography in a relaxed (passive) state, confirmed by electromyography...
November 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29139316/association-of-gastrocnemius-muscle-stiffness-with-passive-ankle-joint-stiffness-and-sex-related-difference-in-the-joint-stiffness
#2
Kintaro Chino, Hideyuki Takashi
Passive ankle joint stiffness is affected by all structures located within and over the joint, and is greater in men than in women. Localized muscle stiffness can be assessed by ultrasound shear wave elastography, and muscle architecture such as fascicle length and pennation angle can be measured by B-mode ultrasonography. Thus, we assessed localized muscle stiffness of the medial gastrocnemius (MG) with consideration of individual variability in the muscle architecture, and examined the association of the muscle stiffness with passive ankle joint stiffness and the sex-related difference in the joint stiffness...
November 15, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29137729/the-shear-wave-elastic-modulus-and-the-increased-nuclear-factor-kappa-b-nf-kb-p65-and-cyclooxygenase-2-cox-2-expression-in-the-area-of-myofascial-trigger-points-activated-in-a-rat-model-by-blunt-trauma-to-the-vastus-medialis
#3
Hengyong Lv, Zhen Li, Tiantian Hu, Yuexiang Wang, Jinpeng Wu, Yingxin Li
We aimed to elucidate the increased inflammatory cytokines expression such as nuclear factor kappa B (NF-kB/p65), cyclooxygenase-2 (COX-2), and voltage-gated calcium channels (VGCC) in the area of activated myofascial trigger points (MTrPs) in a rat model by blunt trauma to the vastus medialis and to evaluate the feasibility of a quantitative analysis of muscle elastic modulus using shear wave elastography (SWE). Twelve 7-week-old male SD rats were divided into normal (NM, n = 6) and model groups (MO, n = 6)...
November 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29075525/chest-wall-underappreciated-structure-in-sonography-part-i-examination-methodology-and-ultrasound-anatomy
#4
REVIEW
Andrzej Smereczyński, Katarzyna Kołaczyk, Elżbieta Bernatowicz
Chest wall ultrasound has been awarded little interest in the literature, with chest wall anatomy described only in limited extent. The objective of this study has been to discuss the methodology of chest wall ultrasound and the sonographic anatomy of the region to facilitate professional evaluation of this complex structure. The primarily used transducer is a 7-12 MHz linear one. A 3-5 MHz convex (curvilinear) transducer may also be helpful, especially in obese and very muscular patients. Doppler and panoramic imaging options are essential...
September 2017: Journal of Ultrasonography
https://www.readbyqxmd.com/read/29058612/skeletal-muscle-mechanics-energetics-and-plasticity
#5
REVIEW
Richard L Lieber, Thomas J Roberts, Silvia S Blemker, Sabrina S M Lee, Walter Herzog
The following papers by Richard Lieber (Skeletal Muscle as an Actuator), Thomas Roberts (Elastic Mechanisms and Muscle Function), Silvia Blemker (Skeletal Muscle has a Mind of its Own: a Computational Framework to Model the Complex Process of Muscle Adaptation) and Sabrina Lee (Muscle Properties of Spastic Muscle (Stroke and CP) are summaries of their representative contributions for the session on skeletal muscle mechanics, energetics and plasticity at the 2016 Biomechanics and Neural Control of Movement Conference (BANCOM 2016)...
October 23, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29049250/comparison-of-the-efficacy-of-gd-eob-dtpa-enhanced-magnetic-resonance-imaging-and-magnetic-resonance-elastography-in-the-detection-and-staging-of-hepatic-fibrosis
#6
Wen-Pei Wu, Cheng-In Hoi, Ran-Chou Chen, Ching-Po Lin, Chen-Te Chou
The present study compared the efficacy of gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI) and magnetic resonance elastography (MRE) in the estimation of hepatic fibrosis stages with histopathologic correlation.This retrospective study included 104 patients (87 men and 17 women; mean age, 60.6 ± 10.6 years) with chronic liver disease who underwent both Gd-EOB-DTPA-enhanced MRI and MRE. The relative enhancement (RE) ratio of the liver parenchyma and the contrast enhancement index (CEI) were calculated as (SIpostliver - SIpreliver)/SIpreliver and SIpost/SIpre, respectively, where SIpost and SIpre were the liver-to-muscle signal intensity ratios on the hepatobiliary phase images and noncontrast-enhanced images, respectively...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29044664/a-new-technique-of-surgical-planning-for-anterior-cruciate-ligament-reconstruction-feasibility-assessment-of-shear-wave-elastography-to-tendon-of-semitendinosus-muscle
#7
Yoshiaki Itoigawa, Yuji Takazawa, Yuichiro Maruyama, Keiichi Yoshida, Tatsuo Sakai, Koichiro Ichimura, Kazuo Kaneko
There is currently no method to quantify the quality of the harvested graft before anterior cruciate ligament (ACL) reconstruction. The purpose of the present study was to explore a method for measuring stiffness of the normal tendon of the semitendinosus muscle using shear wave elastography (SWE). Our investigation comprised two steps. First, we determined orientation of the semitendinosus tendon fibers in 20 lower legs of embalmed cadavers. Second, we investigated the feasibility of quantifying stiffness of the normal semitendinosus tendon by SWE in 24 subjects (48 legs: 24 male and 24 female subjects) in vivo...
October 17, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/29032665/does-standoff-material-affect-acoustic-radiation-force-impulse-elastography-a-preclinical-study-of-a-modified-elastography-phantom
#8
Katharina Hollerieth, Bernhard Gaßmann, Stefan Wagenpfeil, Stephan Kemmner, Uwe Heemann, Konrad Friedrich Stock
Purpose: This study was conducted to determine the influence of standoff material on acoustic radiation force impulse (ARFI) measurements in an elasticity phantom by using two different probes. Methods: Using ARFI elastography, 10 observers measured the shear wave velocity (SWV, m/sec) in different lesions of an elasticity phantom with a convex 4C1 probe and a linear 9L4 probe. The experimental setup was expanded by the use of an interposed piece of porcine muscle as standoff material...
July 28, 2017: Ultrasonography
https://www.readbyqxmd.com/read/29032593/association-analysis-of-the-actn3-r577x-polymorphism-with-passive-muscle-stiffness-and-muscle-strain-injury
#9
Naokazu Miyamoto, Eri Miyamoto-Mikami, Kosuke Hirata, Noriko Kimura, Noriyuki Fuku
Passive muscle stiffness is considered to be a major factor affecting joint flexibility and is thought to relate to the occurrence of muscle strain injury. In skinned muscle fiber experiments, the R577X polymorphism of the α-actinin-3 gene (ACTN3) has been associated with passive muscle stiffness. Our primary purpose was to clarify whether the ACTN3 R577X polymorphism influences passive stiffness of human muscle in vivo. We also examined whether the ACTN3 R577X polymorphism is associated with the occurrence of hamstring strain injury...
October 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28990683/the-effect-of-unit-depth-and-probe-load-on-the-reliability-of-muscle-shear-wave-elastography-variables-affecting-reliability-of-swe
#10
Abdulrahman M Alfuraih, Philip O'Connor, Elizabeth Hensor, Ai Lyn Tan, Paul Emery, Richard J Wakefield
PURPOSE: There is currently no standardized method for muscle shear wave elastography (SWE). The objective of this study was to investigate the effect of unit of measurement, depth, and probe load on the reliability of muscle SWE. METHODS: The vastus lateralis, biceps femoris, biceps brachii, and abductor digiti minimi muscles were scanned on 20 healthy participants. The SWE readings were measured in shear wave velocity (m/s) and Young's modulus (kPa). Three acquisitions of varying depths were acquired from vastus lateralis...
October 9, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/28988152/acute-effects-of-static-stretching-on-the-shear-elastic-moduli-of-the-medial-and-lateral-gastrocnemius-muscles-in-young-and-elderly-women
#11
Masatoshi Nakamura, Tome Ikezoe, Satoru Nishishita, Jun Umehara, Misaka Kimura, Noriaki Ichihashi
PURPOSE: Generally, static stretching (SS) is the recommended intervention for a decline in the range of motion among elderly adults. However, no study has investigated the acute effects of SS on the shear elastic modulus in elderly people. The aims of the present study were to investigate the acute effects of SS on the shear elastic moduli of the medial and lateral gastrocnemius muscles and to examine the differences in these acute effects between young and elderly women. METHODS: This study included 15 healthy young women (age: 23...
September 25, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28979212/muscle-shear-moduli-changes-and-frequency-of-alternate-muscle-activity-of-plantar-flexor-synergists-induced-by-prolonged-low-level-contraction
#12
Ryota Akagi, Takahito Fukui, Masato Kubota, Masashi Nakamura, Ryoichi Ema
During prolonged low-level contractions, synergist muscles are activated in an alternating pattern of activity and silence called as alternate muscle activity. Resting muscle stiffness is considered to increase due to muscle fatigue. Thus, we investigated whether the difference in the extent of fatigue of each plantar flexor synergist corresponded to the difference in the frequency of alternate muscle activity between the synergists using muscle shear modulus as an index of muscle stiffness. Nineteen young men voluntarily participated in this study...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28934633/association-of-low-back-pain-with-muscle-stiffness-and-muscle-mass-of-the-lumbar-back-muscles-and-sagittal-spinal-alignment-in-young-and-middle-aged-medical-workers
#13
Mitsuhiro Masaki, Tomoki Aoyama, Takashi Murakami, Ko Yanase, Xiang Ji, Hiroshige Tateuchi, Noriaki Ichihashi
BACKGROUND: Muscle stiffness of the lumbar back muscles in low back pain (LBP) patients has not been clearly elucidated because quantitative assessment of the stiffness of individual muscles was conventionally difficult. This study aimed to examine the association of LBP with muscle stiffness assessed using ultrasonic shear wave elastography (SWE) and muscle mass of the lumbar back muscle, and spinal alignment in young and middle-aged medical workers. METHODS: The study comprised 23 asymptomatic medical workers [control (CTR) group] and 9 medical workers with LBP (LBP group)...
November 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28900767/quantitative-assessment-of-muscular-stiffness-in-children-with-cerebral-palsy-using-acoustic-radiation-force-impulse-arfi-ultrasound-elastography
#14
Meltem Ceyhan Bilgici, Tumay Bekci, Yasemin Ulus, Hamit Ozyurek, Omer Faruk Aydin, Leman Tomak, Mustafa Bekir Selcuk
PURPOSE: To evaluate the feasibility of quantitative analysis of muscle stiffness in the medial gastrocnemius muscle (GCM) by acoustic radiation force impulse (ARFI) ultrasound elastography in children with spastic cerebral palsy (CP). METHODS: Seventeen children with spastic CP and 25 healthy children participated in the study between the years 2016-2017. The medial GCM in the CP group was assessed using the Modified Ashworth Scale (MAS) by a physiatrist. ARFI was used to measure the shear-wave velocities (SWVs) of the medial GCM...
September 12, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28900566/transversus-abdominis-elasticity-during-various-exercises-a-shear-wave-ultrasound-elastography-study
#15
Kuniaki Hirayama, Ryota Akagi, Yuki Moniwa, Junichi Okada, Hideyuki Takahashi
BACKGROUND: Although the transversus abdominis (TrA) is considered to play a significant role in maintaining trunk stability, there is little information regarding the type of exercise that best facilitates the development of tension in the TrA. Muscle elasticity shows a strong association with muscle tension. Shear wave ultrasound elastography provides a means by which the tension of TrA can be noninvasively estimated, by quantifying it's elasticity. PURPOSE: The purpose of this study was to examine the TrA elasticity during several exercises as measured by shear wave ultrasound elastography, and to determine which of the studied exercises demonstrated the greatest tension...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28885211/postoperative-control-of-functional-muscle-flaps-for-facial-palsy-reconstruction-ultrasound-guided-tissue-monitoring-using-contrast-enhanced-ultrasound-ceus-and-ultrasound-elastography
#16
A Kehrer, V Mandlik, C Taeger, S Geis, L Prantl, E M Jung
BACKGROUND AND OBJECTIVES: Facial paralysis causes excruciating impairments including facial asymmetry, limited eye closure, oral incontinence and social dysfunction. Modern plastic surgical reconstructions render favorable results with well-perfused dynamic muscle flaps. Post-operative tissue monitoring is a critical determinant for success. Contrast-enhanced Ultrasound (CEUS) and elastography have proven superior properties to evaluate tissue perfusion in various organs. We evaluated their role for functional muscle flaps positioned at the sub-skin level in facial palsy patients...
September 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28866442/passive-material-properties-of-stroke-impaired-plantarflexor-and-dorsiflexor-muscles
#17
Kristen L Jakubowski, Ada Terman, Ricardo V C Santana, Sabrina S M Lee
BACKGROUND: Following a stroke, intrinsic muscle properties such as stiffness may be altered, which is accompanied by increased spasticity and contractures. Previously, quantification of muscle stiffness has been based off of indirect measurements. Using shear wave ultrasound elastography, direct measurements of muscle material properties can be made. METHODS: Our aim was to evaluate material properties, specifically passive stiffness, using shear wave ultrasound elastography across a range of muscle lengths, in the medial gastrocnemius and the tibialis anterior in chronic stroke survivors...
November 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28841869/measurements-of-the-trapezius-and-erector-spinae-muscles-using-virtual-touch-imaging-quantification-ultrasound-elastography-a-cross-section-study
#18
Anne Heizelmann, Sümeyra Tasdemir, Julian Schmidberger, Tilmann Gräter, Wolfgang Kratzer, Beate Grüner
BACKGROUND: This study uses virtual touch imaging quantification (VTIQ) technology for the first time to conduct measurements of the trapezius and erector spinae muscles in a large study population. The significance of various influencing factors, such as age and sex, are also examined. METHOD: The study population comprised 278 subjects. The Siemens Acuson S3000 and VTIQ technology were used for measurements of the trapezius and erector spinae muscles (Siemens Healthcare, Erlangen, Germany)...
August 25, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28829699/association-between-years-of-competition-and-shoulder-function-in-collegiate-swimmers
#19
Jack D Dischler, Timothy G Baumer, Evan Finkelstein, Daniel S Siegal, Michael J Bey
BACKGROUND: Shoulder injuries are common among competitive swimmers, and the progression of shoulder pathology is not well understood. The objective of this study was to assess the extent to which years of competitive swim training were associated with physical properties of the supraspinatus muscle and tendon, shoulder strength, and self-reported assessments of shoulder pain and function. HYPOTHESIS: Increasing years of competition will be associated with declining physical properties of the supraspinatus muscle/tendon and declining self-reported assessments of pain and function...
August 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28791501/skeletal-muscle-mass-to-visceral-fat-area-ratio-is-an-important-determinant-affecting-hepatic-conditions-of-non-alcoholic-fatty-liver-disease
#20
Takashi Shida, Kentaro Akiyama, Sechang Oh, Akemi Sawai, Tomonori Isobe, Yoshikazu Okamoto, Kazunori Ishige, Yuji Mizokami, Kenji Yamagata, Kojiro Onizawa, Hironori Tanaka, Hiroko Iijima, Junichi Shoda
BACKGROUND: Not only obesity but also sarcopenia is associated with NAFLD. The influence of altered body composition on the pathophysiology of NAFLD has not been fully elucidated. The aim of this study is to determine whether skeletal muscle mass to visceral fat area ratio (SV ratio) affects NAFLD pathophysiology. METHODS: A total of 472 subjects were enrolled. The association between SV ratio and NAFLD pathophysiological factors was assessed in a cross-sectional nature by stratification analysis...
August 8, 2017: Journal of Gastroenterology
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