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https://www.readbyqxmd.com/read/29447180/experimental-research-on-the-structural-instability-mechanism-and-the-effect-of-multi-echelon-support-of-deep-roadways-in-a-kilometre-deep-well
#1
Rui Peng, Xiangrui Meng, Guangming Zhao, Yingming Li, Jianming Zhu
We study the structural instability mechanism and effect of a multi-echelon support in very-deep roadways. We conduct a scale model test for analysing the structural failure mechanism and the effect of multi-echelon support of roadways under high horizontal stress. Mechanical bearing structures are classified according to their secondary stress distribution and the strength degradation of the surrounding rock after roadway excavation. A new method is proposed by partitioning the mechanical bearing structure of the surrounding rock into weak, key and main coupling bearing stratums...
2018: PloS One
https://www.readbyqxmd.com/read/29413786/arch-index-and-running-biomechanics-in-children-aged-10-14-years
#2
Karsten Hollander, Julie Stebbins, Inke Marie Albertsen, Daniel Hamacher, Kornelia Babin, Claudia Hacke, Astrid Zech
BACKGROUND: While altered foot arch characteristics (high or low) are frequently assumed to influence lower limb biomechanics and are suspected to be a contributing factor for injuries, the association between arch characteristics and lower limb running biomechanics in children is unclear. RESEARCH QUESTION: Therefore, the aim of this study was to investigate the relationship between a dynamically measured arch index and running biomechanics in healthy children...
February 1, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29382479/-does-a-physical-education-lesson-affect-the-foot-morphology-in-school-aged-children
#3
Laura Martín-Casado, Christian Barquín
BACKGROUND: To analyze the changes in foot morphology in school-age children, after a Physical Education lesson. METHODS: A total of 10 school-age children (5 girls and 5 boys) were recruited with a mean age of 9.3 ± 0.5 years that voluntary participated in this study. Measurements of both feet were obtained using a 3D foot digitizer model IFU-S-01 (Japan) in two different moments, before and after a physical education lesson (per-exercise and post-exercise), where different activities involving displacements, jumps and landings were performed...
September 2017: Boletín Médico del Hospital Infantil de México
https://www.readbyqxmd.com/read/29381043/foot-and-ankle-conditions-midfoot-and-forefoot-conditions
#4
Katherine M Edenfield
The midfoot and forefoot are the regions of the foot distal to the talus and calcaneus and are critical to weight bearing and movement. They help support the arch of the foot, provide shock absorption, and convert vertically oriented forces into horizontal forward and propulsive movement. A spectrum of acute, subacute, and chronic conditions in these regions can cause pain and decreased function. A thorough history and physical examination should include foot and leg biomechanics, alignment, and posture in addition to palpation of painful areas...
February 2018: FP Essentials
https://www.readbyqxmd.com/read/29381041/foot-and-ankle-conditions-pes-planus
#5
Charlie Michaudet
Pes planus or pes planovalgus (ie, flatfoot) is a common condition among young children and also is encountered in adults. In children, congenital pes planus typically resolves with age as the foot musculature strengthens. Flexible pes planus is defined as a normal arch during non-weight-bearing activity or tiptoeing, with a flattening arch on standing. In rigid pes planus, the arch remains stiff and collapsed with or without weight bearing. Patients with rigid pes planus should be referred for subspecialist treatment...
February 2018: FP Essentials
https://www.readbyqxmd.com/read/29354578/relationships-between-self-awareness-and-clinical-diagnostic-findings-of-abnormal-foot-arch-height-in-koreans
#6
Youngsuk Son, Hyo Jeong Kang, Yun-Mi Song, Ji Hye Hwang
Objective: To see how people think about their own feet, and evaluate whether there are correlations among self-awareness of the participants and clinical examination findings. Methods: Adult twins and their families who participated in the Healthy Twin study from May 2008 to April 2010 were recruited. Participants were asked whether they thought their feet were normal, flat, or cavus. The lateral talometatarsal angles were measured on foot X-rays to determine the foot arch height...
December 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29354574/biomechanical-parameters-in-plantar-fasciitis-measured-by-gait-analysis-system-with-pressure-sensor
#7
Seung Don Yoo, Hee Sang Kim, Jong Ha Lee, Dong Hwan Yun, Dong Hwan Kim, Jinmann Chon, Seung Ah Lee, Yoo Jin Han, Yun Soo Soh, Yong Kim, Seonyoung Han, Woojin Lee, Young Rok Han
Objective: To investigate the differences in biomechanical parameters measured by gait analysis systems between healthy subjects and subjects with plantar fasciitis (PF), and to compare biomechanical parameters between 'normal, barefooted' gait and arch building gait in the participants. Methods: The researchers evaluated 15 subjects (30 feet) with bilateral foot pain and 15 subjects (15 feet) with unilateral foot pain who had a clinical diagnosis of PF. Additionally, 17 subjects (34 feet) who had no heel pain were recruited...
December 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29353999/impact-of-pedal-arch-patency-on-tissue-loss-and-time-to-healing-in-diabetic-patients-with-foot-wounds-undergoing-infrainguinal-endovascular-revascularization
#8
Nicola Troisi, Filippo Turini, Emiliano Chisci, Leonardo Ercolini, Pierfrancesco Frosini, Renzo Lombardi, Francesca Falciani, Cristiana Baggiore, Roberto Anichini, Stefano Michelagnoli
Objective: To retrospectively evaluate the impact of pedal arch quality on tissue loss and time to healing in diabetic patients with foot wounds undergoing infrainguinal endovascular revascularization. Materials and Methods: Between January 2014 and June 2015, 137 consecutive diabetic patients with foot wounds underwent infrainguinal endovascular revascularization (femoro-popliteal or below-the-knee, arteries). Postprocedural angiography of the foot was used to divide the patients into the following three groups according to the pedal arch status: complete pedal arch (CPA), incomplete pedal arch (IPA), and absent pedal arch (APA)...
January 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29327550/-study-on-the-correlative-factors-of-the-pain-under-the-second-metatarsal-in-patients-with-hallux-valgus
#9
Jian-Gang Zuo, Hai-Wei Hu, Zhi-Cheng Sang, Jian-Min Wen, Wei-Dong Sun, Yong-Sheng Sun, Ting Cheng
OBJECTIVE: To analyze the correlation between the hallux valgus angle and arch X-ray parameters change, plantar pressure by measuring the X-ray indexes and foot-pressure indexes in patients with hallux valgus, as well as to study the main cause factors for the pain under the second metatarsal head. METHODS: A retrospective study of 254 patients(477 feet) treated in Wangjing Hospital from January 2012 to June 2013 was performed. The pain under the second metatarsal head and age distribution were recorded...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29284231/assessment-of-the-influence-of-jogging-on-the-shape-of-female-foot-arches
#10
Agata Maslon, Joanna Golec, Elzbieta Szczygiel, Dorota Czechowska, Boguslaw Golec
INTRODUCTION: Both walking and its faster, running, consist of cyclical subsequent phases of swing and support; however, they differ in their time proportions as well as magnitude of acting forces. There is a lack of studies concerning the long-term consequences of repeated jogging cycles on the function of feet and, above all, on their permanent impact on the shape of foot arches. OBJECTIVES: The objective of this study was to answer the question whether regular jogging changes the shape of the transverse and medial longitudinal arches of the feet...
December 23, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/29274694/acute-type-a-aortic-dissection-causing-collapse-of-previous-stent-graft
#11
Ha-Eun Kim, Hyun-Chel Joo
A 69-year old man presented to the emergency department with back pain and paraplegia. Computed tomography showed acute type A aortic dissection with primary tear right below the origin of the left subclavian artery. He had undergone endovascular aneurysm repair (EVAR) 13 months earlier, and the previously inserted EVAR graft totally collapsed. Total arch replacement covering primary entry tear was performed. Femoral pulse was undetected prior to surgery, but was monitored post-surgically after cardiopulmonary bypass weaning...
December 21, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29251168/lateral-collapse-of-the-tarsal-navicular-in-patients-with-rheumatoid-arthritis-implications-for-pes-planovarus-deformity
#12
Takumi Matsumoto, Yuji Maenohara, Song Ho Chang, Jun Hirose, Takuo Juji, Katsumi Ito, Sakae Tanaka
OBJECTIVES: In patients with rheumatoid arthritis (RA), the talonavicular joint is commonly involved and midfoot collapse can lead to progressive flattening of the arch. Despite a general awareness of the important structural role of the talonavicular joint in rheumatoid foot disease, details of its destructive pattern has not been elucidated. METHODS: We cross-sectionally investigated 176 RA patients (342 feet) and classified their feet into the following five groups according to radiographic findings: arthritis; (RA changes with normal navicular shape), Müller-Weiss Disease (MWD); (collapse of the lateral aspect of the tarsal navicular), flat; (flattened navicular), ankylosis; (ankylosis of the talonavicular joint), and normal...
December 18, 2017: Modern Rheumatology
https://www.readbyqxmd.com/read/29249349/fully-automated-determination-of-arch-angle-on-weight-bearing-foot-radiograph
#13
E-Fong Kao, Chiao-Yi Lu, Chi-Yuan Wang, Wei-Chen Yeh, Pang-Kai Hsia
BACKGROUND AND OBJECTIVE: Flatfeet can be evaluated by measuring the calcaneal-fifth metatarsal angle on a weight-bearing lateral foot radiograph. This study aimed to develop an automated method for determining the calcaneal-fifth metatarsal angle on weight-bearing lateral foot radiograph. METHOD: The proposed method comprises four processing steps: (1) identification of the regions including the calcaneus and fifth metatarsal bones in a foot image; (2) delineation of the contours of the calcaneus and the fifth metatarsal; (3) determination of the tangential lines of the two bones from the contours; and (4) determination of the calcaneal-fifth metatarsal angle between the two tangential lines as arch angle...
February 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29247970/comprehensive-biomechanical-characterization-of-feet-in-usma-cadets-comparison-across-race-gender-arch-flexibility-and-foot-types
#14
Jinsup Song, Kersti Choe, Michael Neary, Rebecca A Zifchock, Kenneth L Cameron, Michael Trepa, Marian T Hannan, Howard Hillstrom
Lower extremity musculoskeletal injuries are common, complex, and costly problems. Literature supports associations between static foot structure and dynamic foot function, as well as between overuse injury and demographic characteristics. Previous studies failed to provide a comprehensive biomechanical foot characteristics of at-risk military personnel. In this study, foot structure, function, and arch height flexibility (AHF) were objectively measured in 1090 incoming cadets (16.3% female, mean age of 18...
December 6, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29244535/whether-flexible-flatfoot-needs-the-treatment-an-observation-of-plantar-pressure-effects-on-adults-with-flexible-flatfoot-by-wearing-over-the-counter-insoles-when-walking-on-level-surface-upstairs-and-downstairs
#15
JunNa Zhai, Jue Wang, YuSheng Qiu
BACKGROUND: Orthotic insole is one popular physiotherapy for flatfoot. However, the effects and if flexible flatfoot needs the treatment are not clear and how the plantar pressure change while walking upstairs and downstairs had not been studied. This study observed the plantar pressure of different walking condition to find out the answers. METHODS: Fifteen adults with flexible flatfoot and fifteen adults with normal foot were examined while walking on a level surface, walking up and down 10 cm and 20 cm stairs before treatment...
December 15, 2017: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/29239782/the-morphology-of-foot-soft-tissues-is-associated-with-running-shoe-type-in-healthy-recreational-runners
#16
Xianyi Zhang, Tijs Delabastita, Joselien Lissens, Floor De Beenhouwer, Benedicte Vanwanseele
OBJECTIVES: To determine the differences in the morphology of foot soft tissues between runners using different types of running shoes. DESIGN: Cross-sectional study. METHODS: Thirty-eight recreational runners were divided into four groups based on running shoe type, namely, neutral shoes, motion control shoes, minimalistic shoes and neutral shoes with custom-made insoles. An arch height index and a relative arch deformation index were calculated for each participant...
November 22, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29234565/reliability-of-ankle-foot-morphology-mobility-strength-and-motor-performance-measures
#17
John J Fraser, Rachel M Koldenhoven, Susan A Saliba, Jay Hertel
Background: Assessment of foot posture, morphology, intersegmental mobility, strength and motor control of the ankle-foot complex are commonly used clinically, but measurement properties of many assessments are unclear. Purpose: To determine test-retest and inter-rater reliability, standard error of measurement, and minimal detectable change of morphology, joint excursion and play, strength, and motor control of the ankle-foot complex. Design: Reliability study...
December 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29230404/experimental-gait-analysis-to-study-stress-distribution-of-the-human-foot
#18
Vidya K Nandikolla, Robin Bochen, Steven Meza, Allan Garcia
Researchers and clinicians are increasingly using plantar pressure and force measurement system to evaluate foot functions. This research evaluates the quality and reliability of a Tekscan HR mat to study the plantar pressures and forces acting during walking, running, jumping, and standing of healthy subjects. The following regions of the foot were investigated: heel, mid foot, metatarsophalangeal joint, hallux, and the toes. The arches of both feet of the three healthy subjects in the gait analysis were presented which addresses the balancing issues of the body during locomotion...
2017: Journal of Medical Engineering
https://www.readbyqxmd.com/read/29214919/effect-of-total-contact-orthosis-on-medial-longitudinal-arch-and-lower-extremities-in-flexible-flatfoot-subjects-during-walking
#19
Tulaya Prachgosin, Wipawan Leelasamran, Pruittikorn Smithmaitrie, Surapong Chatpun
BACKGROUND: Total-contact orthosis (TCO) is one kind of foot orthosis (FO) that is used to adjust biomechanics in flexible flatfoot. OBJECTIVE: To determine the effects of a TCO on the MLA moment, MLA deformation angle and lower limb biomechanics. STUDY DESIGN: Cross-sectional study. METHODS: Seven-flatfoot and thirteen-normal foot subjects were recruited by footprint and radiographs. The biomechanics of subjects with normal foot (NF), flatfoot with shoe only (FWOT) and flatfoot with TCO (FWT) were collected in a 3D motion analysis laboratory and force plates...
December 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29213246/the-influence-of-footwear-on-the-modular-organization-of-running
#20
Alessandro Santuz, Antonis Ekizos, Lars Janshen, Vasilios Baltzopoulos, Adamantios Arampatzis
For most of our history, we predominantly ran barefoot or in minimalist shoes. The advent of modern footwear, however, might have introduced alterations in the motor control of running. The present study investigated shod and barefoot running under the perspective of the modular organization of muscle activation, in order to help addressing the neurophysiological factors underlying human locomotion. On a treadmill, 20 young and healthy inexperienced barefoot runners ran shod and barefoot at preferred speed (2...
2017: Frontiers in Physiology
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