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https://www.readbyqxmd.com/read/28432448/resistance-to-radial-expansion-limits-muscle-strain-and-work
#1
E Azizi, A R Deslauriers, N C Holt, C E Eaton
The collagenous extracellular matrix (ECM) of skeletal muscle functions to transmit force, protect sensitive structures, and generate passive tension to resist stretch. The mechanical properties of the ECM change with age, atrophy, and neuromuscular pathologies, resulting in an increase in the relative amount of collagen and an increase in stiffness. Although numerous studies have focused on the effect of muscle fibrosis on passive muscle stiffness, few have examined how these structural changes may compromise contractile performance...
April 21, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28426158/a-novel-technique-for-decellularization-of-allogenic-nerves-and-in-vivo-study-of-their-use-for-peripheral-nerve-reconstruction
#2
F Boriani, N Fazio, C Fotia, L Savarino, N Nicoli Aldini, L Martini, N Zini, M Bernardini, N Baldini
Autografts represent the gold standard for peripheral nerve reconstruction but their limited availability, the discrepancy of nerve caliber and long surgical times are drawbacks. Allografts have therefore become a valid alternative option. In particular, acellular nerve allografts (ANAs) rather than fresh allografts do not need immunosuppression and appear to be safe and effective based on recent studies. An innovative method was conceived to obtain ANAs, so as to speed up nerve decellularization, without compromising nerve architecture, and without breaking the asepsis chain...
April 20, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28424850/incidence-and-mri-characterization-of-the-spectrum-of-posterolateral-corner-injuries-occurring-in-association-with-acl-rupture
#3
Eduardo Frois Temponi, Lúcio Honório de Carvalho Júnior, Adnan Saithna, Mathieu Thaunat, Bertrand Sonnery-Cottet
OBJECTIVE: To determine the incidence and MRI characteristics of the spectrum of posterolateral corner (PLC) injuries occurring in association with anterior cruciate ligament (ACL) rupture. MATERIALS AND METHODS: We carried out a level IV, retrospective case series study. All patients clinically diagnosed with an ACL rupture between July 2015 and June 2016 who underwent MRI of the knee were included in the study. In addition to standard MRI knee reporting, emphasis was placed on identifying injury to the PLC and a description of involvement of these structures by two musculoskeletal radiologists...
April 20, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28419543/aging-does-not-alter-tendon-mechanical-properties-during-homeostasis-but-does-impair-flexor-tendon-healing
#4
Jessica E Ackerman, Ibrahima Bah, Jennifer H Jonason, Mark R Buckley, Alayna E Loiselle
Aging is an important factor in disrupted homeostasis of many tissues. While an increased incidence of tendinopathy and tendon rupture are observed with aging, it is unclear whether this is due to progressive changes in tendon cell function and mechanics over time, or an impaired repair reaction from aged tendons in response to insult or injury. In the present study we examined changes in the mechanical properties of Flexor Digitorum Longus (FDL), Flexor Carpi Ulnaris (FCU), and tail fascicles in both male and female C57Bl/6 mice between 3-27 months of age to better understand the effects of sex and age on tendon homeostasis...
April 17, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28407360/the-anterolateral-ligament-a-cadaveric-study-in-foetuses
#5
Ainhoa Nekane Toro-Ibarguen, Juan Pretell-Mazzini, Elena Pérez, Isabel Pedrajas, Juan Miguel Cano-Egea, Jose Ramón Sanudo
INTRODUCTION: The aim of this study was to determine the presence and morphology of the anterolateral ligament (ALL) of the knee in a sample of fetuses. We hypothesized that the ALL is present in sample fetuses and its origin is not related to repetitive stresses throughout life. MATERIAL & METHODS: Forty fresh-frozen knees from cadaveric fetuses were dissected using a standard technique. The ALL and other structures in the anterolateral compartment of the knee were identified...
April 13, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28392769/force-depression-in-plantar-flexors-exists-equally-in-plantar-flexed-and-dorsiflexed-regions
#6
Atsuki Fukutani, Jun Misaki, Tadao Isaka
Isometric muscle force attained during isometric contractions decreases after active shortening compared to that attained during purely isometric contractions. This phenomenon is called residual force depression. The aim of this study was to examine whether residual force depression occurs in human plantar flexors in both plantar flexed and dorsiflexed region. In addition, the magnitude of fascicle shortening was evaluated because not only muscle force but also fascicle shortening during active shortening are considered to affect force depression...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28391718/mixed-lymphangioma-and-cavernous-hemangioma-within-the-ulnar-nerve-a-case-report
#7
Michael Canaan Prater, Brian A Janz
BACKGROUND: Lymphangiomas are benign lymphatic vessel hamartomas typically found in the skin or subcutaneous tissue of the head and neck. Although mostly seen in a congenital context, acquired forms have been reported. By contrast, cavernous hemangiomas are benign hamartomas of endothelial origin. They can arise anywhere in the body, but are typically described as arising from the central nervous system. METHODS: We report the case of a young patient who developed a mixed lymphangioma and cavernous hemangioma within the ulnar nerve...
April 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28388973/why-do-inguinal-hernia-patients-have-pain-histology-points-to-compression-neuropathy
#8
Robert Wright, Donald E Born, Natasha D'Souza, Larissa Hurd, Rachel Gill, Daniel Wright
PURPOSE: The purpose of this study is to describe the known soft tissue neuro-histology factors associated with compression neuropathy in relation to the incidence of preoperative pain in primary inguinal hernia. Enlargement of the ilioinguinal nerve occurs in 63% of patients with primary inguinal hernia; compression neuropathy has similar gross features. METHODS: Patients completed pain questionnaires pertaining to preoperative pain and the quality of pain experienced...
March 22, 2017: American Journal of Surgery
https://www.readbyqxmd.com/read/28386453/both-the-elongation-of-attached-crossbridges-and-residual-force-enhancement-contribute-to-joint-torque-enhancement-by-the-stretch-shortening-cycle
#9
Atsuki Fukutani, Jun Misaki, Tadao Isaka
This study examined the influence of the elongation of attached crossbridges and residual force enhancement on joint torque enhancement by the stretch-shortening cycle (SSC). Electrically evoked submaximal tetanic plantar flexions were adopted. Concentric contractions were evoked in the following three conditions: after 2 s isometric preactivation (ISO condition), after 1 s isometric then 1 s eccentric preactivation (ECC condition), and after 1 s eccentric then 1 s isometric preactivation (TRAN condition)...
February 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28382924/fascicular-nerve-stimulation-and-recording-using-a-novel-double-aisle-regenerative-electrode
#10
Ignacio Delgado-Martínez, Martina Righi, Daniel Santos, Annarita Cutrone, Silvia Bossi, Silvia D'Amico, Jaume Del Valle, Silvestro Micera, Xavier Navarro
OBJECTIVE: As artificial prostheses become more refined, they are most often used as a therapeutic option for hand amputation. Differently from extra- or intraneural interfaces, regenerative nerve electrodes are designed to enable electrical interface with regrowing axonal bundles of injured nerves, aiming to achieve high selectivity for recording and stimulation. However, most of the developed designs pose an obstacle to the regrowth mechanisms due to low transparency and cause an impairment of the nerve regeneration...
April 6, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28372808/differential-effect-of-chronic-undernutrition-on-the-fiber-type-composition-of-fascicles-in-the-extensor-digitorum-longus-muscles-of-the-rat
#11
Enrique Vázquez-Mendoza, Erika Elizabeth Rodríguez-Torres, Kenia López-García, Cindy Xilonen Hinojosa-Rodríguez, Ismael Jiménez-Estrada
Several studies have shown that chronic low food consumption alters the composition and metabolism of the extensor digitorum longus muscle (EDLm) fiber types. EDLm is constituted by four independent fascicles (F2-F5) of different sizes; their constitution and metabolism, however, as well as how chronic undernourishment affects these is virtually unknown. Thus, the aim of this study is to evaluate the relative fiber type composition and metabolism of each independent fascicle in the EDLm, using control and chronically undernourished young male rats by using the alkaline ATPase and NADH-TR histochemical techniques...
March 31, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28369824/medial-gastrocnemius-and-soleus-muscle-tendon-unit-fascicle-and-tendon-interaction-during-walking-in-children-with-cerebral-palsy
#12
Lee Barber, Chris Carty, Luca Modenese, John Walsh, Roslyn Boyd, Glen Lichtwark
AIM: This study investigates the in vivo function of the medial gastrocnemius and soleus muscle-tendon units (MTU), fascicles, and tendons during walking in children with cerebral palsy (CP) and an equinus gait pattern. METHOD: Fourteen children with CP (9 males, 5 females; mean age 10y 6mo, standard deviation [SD] 2y 11mo; GMFCS level I=8, II=6), and 10 typically developing (6 males, 4 females; mean age 10y, SD 2y 1mo) undertook full body 3D gait analysis and simultaneous B-mode ultrasound images of the medial gastrocnemius and soleus fascicles during level walking...
April 1, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28362958/outcomes-of-transferring-a-healthy-motor-fascicle-from-the-radial-nerve-to-a-branch-for-the-triceps-to-recover-elbow-extension-in-partial-brachial-plexus-palsy
#13
Leandro Pretto Flores
BACKGROUND: Triceps reinnervation is an important objective to pursue when repairing the brachial plexus for cases with upper roots injuries, and a number of different techniques have been developed in order to restore elbow extension in such cases. OBJECTIVE: To demonstrate the surgical outcomes associated with the technique of transferring a single healthy motor fascicle from the radial nerve of the affected arm to a branch innervating 1 of the 3 heads of the triceps...
March 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28343319/robotic-resection-of-an-obturator-schwannoma-with-preservation-of-normal-nerve-fascicles-and-function
#14
Hubert Perrin, Philippe Brunner, Jean Claude Ortega, Bertrand Mercier, Nathalie Clement, Christophe Robino, Maurice Chazal
An asymptomatic pelvic tumor was incidentally found in a 27-year-old man. A CT-guided needle biopsy with a pathologic examination confirmed the diagnosis of a benign schwannoma. We describe the complete robotic resection with the conservation of normal fascicles. The postoperative course was uneventful. No neurological deficit occurred, and the electromyogram was normal 6 weeks and 7 months later.
March 25, 2017: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/28341304/the-normal-variants-in-the-left-bundle-branch-system
#15
REVIEW
M V Elizari
This article reviewed the main anatomic and physiopathological aspects of the left bundle branch from its origin in the His bundle and its intraventricular distribution on the left endocardial surface. The results are based on the relevant literature and on personal observations executed on 206 hearts distributed as follows: 67 dogs, 60 humans, 45 sheep, 22 pigs, 10 cows, 2 monkeys, 1 guanaco, and 1 sea lion. The main anatomical features of the His-Purkinje conducting system may be summarized as follows: The bundle of His is composed by two segments: the penetrating and branching portions...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28341183/transfer-of-extensor-digiti-minimi-and-extensor-carpi-ulnaris-nerve-branches-to-the-intrinsic-motor-nerve-branches-a-histological-study-on-cadaver
#16
Hamid Namazi, Shahin HajiVandi
BACKGROUND: In cases of high ulnar and median nerve palsy, result of nerve repair in term of intrinsic muscle recovery is unsatisfactory. Distal nerve transfer can alleviate the regeneration time and improve the results. Transfer of the extensor digiti minimi (EDM) and extensor carpi ulnaris (ECU) nerve branches to the deep branch of ulnar nerve (DBUN)/ recurrent branch of median nerve (RMN) at wrist had been used to restore intrinsic hand function but, incomplete recovery occured. The axon count at the donor nerve has a strong influence on the final results...
March 21, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28331757/inflammatory-myofibroblastic-tumor-of-the-breast-coexisting-with-pseudoangiomatous-stromal-hyperplasia
#17
Canan Kelten Talu, Yasemin Çakır, Ezgi Hacıhasanoğlu, Cem Leblebici, Şefika Aksoy, Mehmet Ali Nazlı
Inflammatory myofibroblastic tumors (IMTs) are uncommon breast lesions that consist of spindle cells accompanied by plasma cell-rich inflammatory infiltration, which may mimic breast cancer clinico-radiologically. A woman aged 38 years with a breast mass was referred to our general surgery clinic. The physical examination revealed a mass with irregular borders in the upper outer quadrant of the left breast. In mammography, the lesion was 15 mm in diameter with a spheric form and high density. Ultrasonographically, the mass was solid, heterogeneous, and hypoechoic with posterior enhancement...
October 2016: Journal of Breast Health (2013)
https://www.readbyqxmd.com/read/28331221/relationship-between-joint-torque-and-muscle-fascicle-shortening-at-various-joint-angles-and-intensities-in-the-plantar-flexors
#18
Atsuki Fukutani, Jun Misaki, Tadao Isaka
Because it is difficult to measure tendon length changes directly in humans, tendon length changes during dynamic movement have been evaluated indirectly from changes in muscle fascicle length and joint angle. The purpose of this study was to examine the validity of the indirect method. Twitch contractions of the ankle plantar flexors were evoked isometrically in eight subjects. Twitch contractions evoked by singlet, doublet, and triplet stimulations were conducted at dorsiflexion 20° (DF20), plantar flexion 0° (PF0), and plantar flexion 20° (PF20)...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28330041/retinal-tractography-influence-of-diffusion-acquisition-ocular-laterality-and-ocular-dominance-in-healthy-subjects
#19
Clément Jean, Arnaud Attyé, Sylvie Grand, Augustin Lecler, Christophe Chiquet, Florent Aptel, Laurent Lamalle, Alexandre Krainik
PURPOSE: Exploration of the human retina has never been described with MRI tractography, supposedly because of ocular movement-related artifacts and imaging distortions with EPI diffusion acquisition. In this work, we used track-weighting imaging to assess retinal fascicles. Diffusion acquisition parameters influence was studied and the relationship between variability and ocular laterality and ocular dominance was explored. MATERIALS AND METHODS: Twenty healthy subjects underwent MRI, with retinal tractography calculated with the constrained spherical deconvolution model...
March 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28329585/report-of-rare-case-of-dermatofibrosarcoma-protuberans-in-the-buccal-mucosa-review-of-diagnostic-histopathological-and-immunohistochemical-criteria
#20
Amanda Katarinny Goes Gonzaga, Angélica Lopes Cordeiro Mandú, Alexandre Oliveira Sales, Ana Miryam Costa Medeiros, Rodrigo Rodrigues Rodrigues, Patrícia Teixeira Oliveira, Adriano Rocha Germano, Éricka Janine Dantas Silveira
Dermatofibrosarcoma protuberans (DFSP) is an uncommon intermediate-grade soft tissue sarcoma. The tumor is found preferentially on the trunk, whereas the head and neck region are affected in only 10% to 15% of cases. We report the case of a 44-year-old woman with a 5-month history of an asymptomatic, firm, yellow nodule in the mucosa of the right cheek measuring 2.5 cm. The clinical diagnosis was lipoma and an excisional biopsy was obtained. Histopathological analysis revealed a proliferation of spindle-shaped mesenchymal cells arranged in interlacing fascicles amidst fibrous stroma...
October 15, 2016: Dermatology Online Journal
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