23,629 results match your criteria Stress Fracture

Modulation of soy protein isolate gel properties by a novel "two-step" gelation process: Effects of pre-aggregation with different divalent sulfates.

Food Chem 2022 Jun 16;394:133515. Epub 2022 Jun 16.

College of Biological Science and Engineering, Fuzhou University, Fuzhou, Fujian, China. Electronic address:

A novel pre-aggregation process prior to gelation was applied to modulate the aggregation and gelation pathway of soy protein isolate (SPI). SPI dispersions were pre-aggregated with CaSO, MgSO or ZnSO at 0-15 mM and then gelled by adding CaSO up to a final salt concentration of 35 mM. Compared with the sample without pre-aggregation, the storage modulus of SPI gels pre-aggregated with 10 mM CaSO, 10 mM MgSO, and 2. Read More

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Lower-extremity fatigue fracture detection and grading based on deep learning models of radiographs.

Eur Radiol 2022 Jun 24. Epub 2022 Jun 24.

Department of Diagnostic Radiology, Jinling Hospital, Medical School of Nanjing University, 305 East Zhongshan Rd, Nanjing, 210002, China.

Objectives: To identify the feasibility of deep learning-based diagnostic models for detecting and assessing lower-extremity fatigue fracture severity on plain radiographs.

Methods: This retrospective study enrolled 1151 X-ray images (tibiofibula/foot: 682/469) of fatigue fractures and 2842 X-ray images (tibiofibula/foot: 2000/842) without abnormal presentations from two clinical centers. After labeling the lesions, images in a center (tibiofibula/foot: 2539/1180) were allocated at 7:1:2 for model construction, and the remaining images from another center (tibiofibula/foot: 143/131) for external validation. Read More

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Environmental Stress Cracking of High-Density Polyethylene Applying Linear Elastic Fracture Mechanics.

Polymers (Basel) 2022 Jun 14;14(12). Epub 2022 Jun 14.

Bundesanstalt für Materialforschung und-Prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.

The crack propagation rate of environmental stress cracking was studied on high-density polyethylene compact tension specimens under static loading. Selected environmental liquids are distilled water, 2 wt% aqueous Arkopal N100 solution, and two model liquid mixtures, one based on solvents and one on detergents, representing stress cracking test liquids for commercial crop protection products. The different surface tensions and solubilities, which affect the energetic facilitation of void nucleation and craze development, are studied. Read More

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Dipeptidyl Peptidase 3 Activity as a Promising Biomarker of Bone Fragility in Postmenopausal Women.

Molecules 2022 Jun 19;27(12). Epub 2022 Jun 19.

Unit of Metabolic Bone and Thyroid Disorders, Fondazione Policlinico Universitario Campus Bio-Medico, 00128 Rome, Italy.

The dipeptidyl peptidase 3 () is a ubiquitous zinc-dependent aminopeptidase, participating in the activation or degradation of signaling peptides and in the Keap1-Nrf2 antioxidant pathway. The absence of in the knockout mouse model causes increased osteoclast activity, altered osteogenic function, sustained oxidative stress in the bone tissue, and bone loss. We aimed to assess the association of activity with bone fragility in postmenopausal osteoporosis and the impact of denosumab on enzymatic activity. Read More

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Distribution Law of Corrosion Products in a Marine Chloride Environment.

Materials (Basel) 2022 Jun 19;15(12). Epub 2022 Jun 19.

National Engineering Laboratory for High Speed Railway Construction, 22 Shaoshan Road, Changsha 410004, China.

Steel corrosion is the main cause of reinforced concrete cracking. Conventionally, concrete is considered to crack when the circumferential tensile stress reaches the tensile strength of the concrete. However, few analyses have considered the fracture criteria of the internal cross-section of concrete. Read More

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Structural-Temporal Peculiarities of Dynamic Deformation of Layered Materials.

Materials (Basel) 2022 Jun 16;15(12). Epub 2022 Jun 16.

Mathematical and Mechanical Faculty, Saint Petersburg State University, Universitetskiy Prospect 28, Saint Petersburg 198504, Russia.

The temporal nature of static and dynamic deformation of fibre metal laminates is discussed here. The aim of the study is to verify the proposed innovate model using layered composites. The modified relaxation model is based on the earlier formulated plasticity relaxation model for homogeneous materials. Read More

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Deformation, Failure, and Acoustic Emission Characteristics under Different Lithological Confining Pressures.

Materials (Basel) 2022 Jun 15;15(12). Epub 2022 Jun 15.

College of Finance and Economics, Shandong University of Science and Technology, Tai'an 271000, China.

When a temporary support is used to control new surrounding rock in a deep mining roadway, the new surrounding rock is supported by the working resistance of the temporary support. In this study, the influence of deep well boring roadway deformation and rock failure characteristics under different surrounding pressure was investigated. In this paper, for each confining pressure, we experimentally identified the stress-strain, strength, and acoustic emission characteristics of the rocks. Read More

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Influence of Sample Wetting Method on ESC-Behavior of PMMA under Dynamic Fatigue Crack Propagation.

Materials (Basel) 2022 Jun 9;15(12). Epub 2022 Jun 9.

Department of Polymer Engineering, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany.

Environmental stress cracking (ESC) is one of the most prominent failure mechanisms for polymer components. The high sensitivity of plastics in regard to environmental influences has always meant that plastics as materials have been viewed very critically in outdoor applications. Recently, the massive occurrence of microplastics in the environment means that questions about the long-term stability of plastic parts and the studies of plastic fragmentation are of great scientific interest. Read More

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Fracture Mode Transition during Assembly of TC4 High-Lock Bolt under Tensile Load: A Combined Experimental Study and Finite Element Analysis.

Materials (Basel) 2022 Jun 7;15(12). Epub 2022 Jun 7.

College of Engineering, Huazhong Agricultural University, Wuhan 430070, China.

Fracture during the assembly process is an important failure mode for high-lock bolts used in the aviation industry, which greatly increases the potential of unpredictable accidents during service. In the current study, the underlying reasons for fracture during the assembly of a TC4 high-lock bolt was investigated using a tensile test and finite element analysis (FEA). The microstructure of the as-received bolt consisted of a high proportion of α phase, some β phase, and a small amount of α' phase formed via martensite phase transformation during the rammer process. Read More

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Effects of Tearing Conditions on the Crack Propagation in a Monolayer Graphene Sheet.

Int J Mol Sci 2022 Jun 9;23(12). Epub 2022 Jun 9.

School of Science, Harbin Institute of Technology, Shenzhen 518055, China.

The path of crack propagation in a graphene sheet is significant for graphene patterning via the tearing approach. In this study, we evaluate the fracture properties of pre-cracked graphene during the tearing process, with consideration of the effects of the aspect ratio, loading speed, loading direction, and ambient temperatures on the crack propagation in the monolayer sheet. Some remarkable conclusions are drawn based on the molecular dynamic simulation results, i. Read More

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Focal Mechanism and Source Parameters Analysis of Mining-Induced Earthquakes Based on Relative Moment Tensor Inversion.

Int J Environ Res Public Health 2022 Jun 15;19(12). Epub 2022 Jun 15.

School of Mines, China University of Mining & Technology, Xuzhou 221116, China.

Mining-induced earthquakes (MIEs) in underground coal mines have been a common phenomenon that easily triggers rock bursts, but the mechanism is not understood clearly. This research investigates the laws of focal mechanism and source parameters based on focal mechanism and source parameters analysis of MIEs in three frequent rock burst areas. The relative moment tensor inversion (MTI) method was introduced, and the way to construct the inversion matrix was modified. Read More

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Joint Cartilage in Long-Duration Spaceflight.

Biomedicines 2022 Jun 8;10(6). Epub 2022 Jun 8.

Center of Experimental Orthopaedics, Saarland University Medical Center, 66421 Homburg, Germany.

This review summarizes the current literature available on joint cartilage alterations in long-duration spaceflight. Evidence from spaceflight participants is currently limited to serum biomarker data in only a few astronauts. Findings from analogue model research, such as bed rest studies, as well as data from animal and cell research in real microgravity indicate that unloading and radiation exposure are associated with joint degeneration in terms of cartilage thinning and changes in cartilage composition. Read More

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Aminobisphosphonates: Reconsideration 25 years after their approval for the treatment of osteoporosis.

Med Clin (Barc) 2022 Jun 20. Epub 2022 Jun 20.

Departamento de Medicina y Psiquiatría, Universidad de Cantabria, Santander, Cantabria, España; Servicio de Medicina Interna, Hospital Marqués de Valdecilla, Santander, Cantabria, España.

Aminobisphosphonates are widely used in the treatment of osteoporosis. They have a high affinity for hydroxyapatite, binding primarily to resorbing surfaces, but also to forming surfaces and to some extent to resting surfaces. They inhibit osteoclasts, thereby decreasing remodelling units. Read More

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Biomechanical Analysis of the Use of Stems in Revision Total Knee Arthroplasty.

Bioengineering (Basel) 2022 Jun 19;9(6). Epub 2022 Jun 19.

BEAMS Department, Université Libre de Bruxelles, Av. F. Roosevelt, 50 CP165/56, 1050 Bruxelles, Belgium.

Adequate fixation is fundamental in revision total knee arthroplasty; consequently, surgeons must determine the correct set-up for each patient, choosing from numerous stem solutions. Several designs are currently available on the market, but there are no evidence-based quantitative biomechanical guideline yet. Therefore, several stems were designed and analyzed using a previously-validated finite-element model. Read More

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Cementless femoral stem revision in total hip arthroplasty- the periprosthetic clamshell fracture. A biomechanical investigation.

J Orthop Res 2022 Jun 23. Epub 2022 Jun 23.

Department for Orthopaedics and Traumatology, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstrasse 9, 4020 Linz and Altenberger Strasse 69, 4040, Linz, Austria.

To biomechanically evaluate the stability of a diaphyseal anchored, cementless stem in presence of a proximal periprosthetic femoral medial wall defect compared to the stability of the same stem in an intact femur.

Methods: Twenty-two paired human cadaveric femora were pairwise assigned either to a fracture group, featuring a proximal medial wall defect involving 40% of the stems medial anchorage distance, or a control group with native specimens. The specimens were tested under a monotonically increasing cyclic axial loading protocol. Read More

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Medical and Biomechanical Risk Factors for Incident Bone Stress Injury in Collegiate Runners: Can Plantar Pressure Predict Injury?

Orthop J Sports Med 2022 Jun 15;10(6):23259671221104793. Epub 2022 Jun 15.

Stanford Medical Center, Redwood City, California, USA.

Background: Bone stress injury (BSI) is a common reason for missed practices and competitions in elite track and field runners.

Hypothesis: It was hypothesized that, after accounting for medical risk factors, higher plantar loading during running, walking, and athletic movements would predict the risk of future BSI in elite collegiate runners.

Study Design: Cohort study; Level of evidence, 2. Read More

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Spatial Bridge Locking Fixator versus Traditional Locking Plates in Treating AO/OTA 32-A3.2 Fracture: Finite Element Analysis and Biomechanical Evaluation.

Orthop Surg 2022 Jun 22. Epub 2022 Jun 22.

Department of Orthopaedics, First Medical Center, Chinese PLA General Hospital, National Clinical Research Center for Orthopedics, Sports Medicine & Rehabilitation, Beijing, China.

Objective: To compare the biomechanical behaviors of the spatial bridge locking fixator (SBLF), single locking plate (SP), and double locking plate (DP) for AO/OTA 32-A3.2 fractures using finite element analysis and biomechanical tests.

Methods: Axial loading of 700 N was conducted on the AO/OTA 32-A3. Read More

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Biomechanical Analysis of Tibiofibular Syndesmosis Injury Fixation Methods: A Finite Element Analysis.

J Foot Ankle Surg 2022 May 18. Epub 2022 May 18.

Assistant Professor, Department of Civil Engineering, Necmettin Erbakan University, Konya, Turkey.

The optimal treatment strategy after syndesmotic injuries is still controversial. In our study, we aimed to evaluate ideal fixation method in syndesmotic injury by using finite element analysis method. A 3D SolidWorks model file was created by taking computed tomography (CT) images of the area from the right foot base to the knee joint level of a healthy adult male. Read More

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Implementing mindfulness meditation in hand surgery training: a feasibility study.

Eur J Plast Surg 2022 Jun 10:1-8. Epub 2022 Jun 10.

Plastic Surgery Department, Guy's and St. Thomas' Hospital NHS Foundation Trust, London, SE1 7EH UK.

Background: Surgery can be stressful, requiring decision-making and performance under pressure. The COVID-19 pandemic has further challenged surgeons' well-being and training. Excess stress adversely affects well-being, technical and non-technical performance, and, by extension, patient care. Read More

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The Effects of a Vertical Compressive Cyclic Load on Abutment Screws and the Stability of the Prosthesis in Nonengaging and Partially Engaging Abutments in a Screw-Retained Splinted Fixed Dental Prosthesis.

Int J Oral Maxillofac Implants 2022 May-Jun;37(3):571-578

Purpose: To evaluate the effects of vertical compressive cyclic load on abutment screws and the stability of screw-retained splinted fixed dental prostheses supported by bone-level nonengaging and partially engaging abutments.

Materials And Methods: Ten standardized two-unit prostheses integrated with nonengaging and partially engaging abutments were 3D-printed and cast in nonprecious metal and attached to two implant analogs with conical connections angled 15 degrees toward the vertical axis in a resin bock. The common path of insertion for the prosthesis with partially engaging abutments to angled implant analogs was created by selectively reducing the abutment surface that obstructed the implant housing. Read More

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Fatigue and Stress Distribution Analyses of Ceramic-Reinforced PEEK Abutments Restored with Monolithic Zirconia Crowns as an Alternative to Conventional Esthetic Abutments.

Int J Oral Maxillofac Implants 2022 May-Jun;37(3):533-542

Purpose: To determine the fracture strength and stress distribution of esthetic dental implant abutments.

Materials And Methods: Fifty specimens were prepared. Four hybrid abutment groups with titanium bases (zirconia [Z], lithium disilicate [L], ceramic-reinforced polymer [B] and [BC]) and a custom titanium abutment control group (T) were restored with monolithic zirconia crowns except BC, which was crowned with layered composite. Read More

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Effects of badminton insole design on stress distribution, displacement and bone rotation of ankle joint during single-leg landing: a finite element analysis.

Sports Biomech 2022 Jun 20:1-22. Epub 2022 Jun 20.

Bioinspired Devices and Tissue Engineering (BIOINSPIRA) Research Group, School of Biomedical Engineering and Health Sciences, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia.

Previous research has reported that up to 92% of injuries amongst badminton players consist of lower limb, whereby 35% of foot fractures occurred at the metatarsal bone. In sports, insoles are widely used to increase athletes' performance and prevent many injuries. However, there is still a lack of badminton insole analysis and improvements. Read More

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The Anatomy and Function of the Individual Bands of the Deltoid Ligament-and Implications for Stability Assessment of SER Ankle Fractures.

Foot Ankle Orthop 2022 Apr 14;7(2):24730114221104078. Epub 2022 Jun 14.

Department of Orthopaedic Surgery, Østfold Hospital Trust, Grålum, Norway.

Background: Deltoid ligament injury occurs often with supination-external rotation (SER) ankle trauma. SER fibula fractures with concomitant deltoid ligament injury are considered unstable-requiring operative fixation. Recent studies have questioned this general practice with emphasis on better defining the medial side ankle ligamentous injury. Read More

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Experimental Study on the Spatial-Temporal Failure Characteristics of Red Sandstone with a Cemented Structural Surface under Compression.

ACS Omega 2022 Jun 1;7(23):20250-20258. Epub 2022 Jun 1.

School of Energy and Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, People's Republic of China.

A geological structural surface frequently appears in underground engineering and it significantly affects the stability of engineering structures. To elucidate the spatial-temporal failure characteristics of discontinuities between rocks, red sandstone with a firmly cemented discontinuity was investigated under uniaxial compression. The results revealed that adding a strong binder to rock discontinuities can improve the shear strength and stability of rock mass. Read More

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Analysis of Factors of Productivity of Tight Conglomerate Reservoirs Based on Random Forest Algorithm.

ACS Omega 2022 Jun 3;7(23):20390-20404. Epub 2022 Jun 3.

CNOOC Research Institute Co., Ltd., Beijing 100028, China.

The tight conglomerate reservoir of Baikouquan formation in the MA 131 well block in the Junggar basin abounds with petroleum reserves, yet the vertical wells in this reservoir have achieved a limited development effect. The tight conglomerate reservoirs have become an important target for exploration and exploitation. The high-efficiency development scheme of a small well spacing three-dimensional (3D) staggered well pattern has been determined by a series of field tests on well pattern and well spacing development. Read More

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Does Sectioning and Then Repairing of the Calcaneofibular Ligament at Subtalar Approach Lead to Residual Lateral Ankle Instability?

Arch Bone Jt Surg 2022 Apr;10(4):347-352

Department of Orthopedic and Traumatology, Prof. Dr. Cemil Taşçıoğlu City Hospital, İstanbul, Turkey.

Background: The calcaneofibular ligament is cut to increase vision in surgical field in minimally invasive surgery of displaced intraarticular calcaneus fractures with subtalar incision. We aimed to investigate whether this causes talar tilt instability in ankle stress radiographs due to the calcaneofibular ligament deficiency in postoperative period.

Methods: The files of 38 patients who were operated with the diagnosis of displaced calcaneus fracture between 2013 and 2018 were examined retrospectively. Read More

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Appropriateness and Associated Factors of Stress Ulcer Prophylaxis for Surgical Inpatients of Orthopedics Department in a Tertiary Hospital: A Cross-Sectional Study.

Front Pharmacol 2022 2;13:881063. Epub 2022 Jun 2.

Department of Pharmacy, Xijing Hospital, The Fourth Military Medical University, Xi'an, China.

Stress ulcer prophylaxis (SUP) prescribed in patients admitted to surgical wards with a low risk of stress-related mucosal disease (SRMD) accounted for a considerable proportion of improper use of proton pump inhibitors (PPIs). This study aimed to analyze the appropriateness of SUP prescribing patterns and identify its associated factors in the orthopedics department of a tertiary hospital in the Northwestern China. In this cross-sectional study, information regarding the demographic and clinical characteristics of 1,200 fracture inpatients who underwent surgical operations from January 2020 to August 2021 were collected from medical records. Read More

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Effects of Incontro, Alleanza, Responsabilita, Autonomia Intervention Model Combined with Orem Self-Care Model and the Use of Smart Wearable Devices on Perceived Stress and Self-Efficacy in Patients after Total Hip Arthroplasty.

Comput Intell Neurosci 2022 9;2022:5780084. Epub 2022 Jun 9.

Medical College of Yangzhou University, Yangzhou, Jiangsu Province 225009, China.

Objective: To explore the effects of Incontro, Alleanza, Responsabilita, Autonomia (IARA) combined with Orem self-care model and the use of smart wearable devices on perceived stress and self-efficacy in patients after total hip arthroplasty (THA).

Methods: A total of 60 patients after THA in our hospital were enrolled. Patients were randomly divided into control group (IARA intervention model combined with Orem self-care model) and study group (intelligent wearable device combined conference-IARA and Orem self-care model). Read More

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Computed Tomography-Based Stiffness Measures of Trabecular Bone Microstructure: Cadaveric Validation and In Vivo Application.

JBMR Plus 2022 Jun 5;6(6):e10627. Epub 2022 May 5.

Department of Electrical and Computer Engineering University of Iowa Iowa City IA USA.

Osteoporosis causes bone fragility and elevates fracture risk. Applications of finite element (FE) analysis (FEA) for assessment of trabecular bone (Tb) microstructural strength at whole-body computed tomography (CT) imaging are limited due to challenges with Tb microstructural segmentation. We present a nonlinear FEA method for distal tibia CT scans evading binary segmentation of Tb microstructure, while accounting for bone microstructural distribution. Read More

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Biomechanical evaluation on a novel design of biodegradable embossed locking compression plate for orthopaedic applications using finite element analysis.

Biomech Model Mechanobiol 2022 Jun 18. Epub 2022 Jun 18.

Department of Mechanical Engineering, Maulana Azad National Institute of Technology, Bhopal, 462003, India.

In orthopaedics, conventional implant plates such as locking compression plate (LCP) made from non-biodegradable materials play a vital role in the fixation to support bone fractures, but also create a complication such as stress shielding. These again require a painful surgery to remove/replace after they have healed as it does not degrade into the physiological environment (PE). Currently, there has already been enough discovery of biodegradable materials that, despite being mechanically inefficient compared to non-biodegradable materials, can completely be biodegraded in PE during and after healing to avoid such problems. Read More

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