930 results match your criteria measuring load-bearing


Versatile GCH Control Software for Correction of Loads Applied to Forearm Crutches During Gait Recovery Through Technological Feedback: Development and Implementation Study.

J Med Internet Res 2021 Sep 22;23(9):e27602. Epub 2021 Sep 22.

Department of Nursing and Physiotherapy, Empowering Health by Physical Activity, Exercise and Nutrition Research Group CTS-1038, University of Cadiz, Cadiz, Spain.

Background: Measuring weight bearing is an essential aspect of clinical care for lower limb injuries such as sprains or meniscopathy surgeries. This care often involves the use of forearm crutches for partial loads progressing to full loads. Therefore, feasible methods of load monitoring for daily clinical use are needed. Read More

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September 2021

Does metatarsus primus elevatus really exist in hallux rigidus? A weightbearing CT case-control study.

Arch Orthop Trauma Surg 2021 Sep 9. Epub 2021 Sep 9.

Department of Orthopaedic and Rehabilitation, University of Iowa, 200 Hawkins Drive John Pappajon Pavilion, Room 01066, Iowa City, IA, 52242, USA.

Background: Elevated first metatarsal, Metatarsus primus elevatus (MPE), has been a topic of controversy. Recent studies have supported a significantly elevated first metatarsal in hallux rigidus on weight-bearing radiographs (WBR). However, conventional radiographs have limitations for accurate measurement. Read More

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September 2021

Comparison between 2D radiographic weight-bearing joint space width and 3D MRI non-weight-bearing cartilage thickness measures in the knee using non-weight-bearing 2D and 3D CT as an intermediary.

Ther Adv Chronic Dis 2021 21;12:20406223211037868. Epub 2021 Aug 21.

Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht, The Netherlands.

Background: In knee osteoarthritis, radiographic joint space width (JSW) is frequently used as a surrogate marker for cartilage thickness; however, longitudinal changes in radiographic JSW have shown poor correlations with those of magnetic resonance imaging (MRI) cartilage thickness. There are fundamental differences between the techniques: radiographic JSW represents two-dimensional (2D), weight-bearing, bone-to-bone distance, while on MRI three-dimensional (3D) non-weight-bearing cartilage thickness is measured. In this exploratory study, computed tomography (CT) was included as a third technique, as it can measure bone-to-bone under non-weight-bearing conditions. Read More

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Urinary neopterin and total neopterin measurements allow monitoring of oxidative stress and inflammation levels of knee and hip arthroplasty patients.

PLoS One 2021 17;16(8):e0256072. Epub 2021 Aug 17.

School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.

Knee and hip arthroplasty are common surgeries within an aging population. Some data has suggested that knee arthroplasty is more traumatic to the body than hip arthroplasty due to the increased complexity and load bearing nature of the joint. Here, we compare the stress of the two surgeries by measuring urinary neopterin and total neopterin as biomarkers of oxidative stress and inflammation. Read More

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Analysis of the uninjured tibiofibular syndesmosis using conventional CT-imaging and axial force in different foot positions.

Foot Ankle Surg 2021 Jul 26. Epub 2021 Jul 26.

Foot Ankle Unit University Hospital Virgen del Rocío, Seville, Spain; University of Seville, Spain. Electronic address:

Background: Syndesmosis measurments and indices have been controversial and showed interindividual variability. The purpose of this study was to analyze, by conventional axial computed tomography images and a simulated load device, the uninjured tibiofibular syndesmosis under axial force and forced foot positions.

Methods: A total of 15 healthy patients (30 ankles) were studied using adjustable simulated load device (ASLD). Read More

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Analysis for bearing performance and construction mechanical behavior of supporting structure for the large cross-section tunnel by half bench CD method.

Authors:
Rui Zhao

PLoS One 2021 6;16(8):e0255511. Epub 2021 Aug 6.

School of Civil Engineering, Weinan Vocational and Technical College, Weinan, Shaanxi, China.

Based on the engineering practice of large cross-section highway tunnel, this paper reveals the space-time coordinated evolution law of the construction mechanical characteristics and deformation distribution of the support structure in the construction by half bench CD method through field test. At the same time, the mechanical response calculation model of the supporting structure in the partial excavation is constructed, and the mechanical characteristics of the support structure in the partial excavation process are analyzed by above mechanical calculation model. Then, the mechanical and deformation distribution of the feet-reinforcement bolt in the steel frame-foot-reinforcement bolt combined support system is analyzed under different levels of surrounding rock load and different structural parameters of the feet-reinforcement bolt. Read More

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Adverse events in the treatment of motorcycle-related isolated limb injuries at a regional hospital in Uganda: a prospective clinical analysis.

Int Orthop 2021 Jul 23. Epub 2021 Jul 23.

Department of Surgery, Mbarara University of Science and Technology, P.O. Box 1410, Mbarara, Uganda.

Purpose: Although motorcycle accidents are a leading cause of limb injury in Uganda, little is known about injury care quality at regional hospitals. This study measured the incidence of clinical adverse events (CAEs) and identified associated treatment barriers surrounding motorcycle-related isolated limb injuries at a regional hospital.

Methods: A prospective descriptive study was conducted among patients with motorcycle-related isolated limb injuries at a Ugandan regional hospital between September 2017 and February 2018. Read More

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Roof arc width: The novel calculation method for calculation of patient specific roof arc width in acetabular fractures.

J Orthop 2021 Jul-Aug;26:29-35. Epub 2021 Jul 9.

Sir HN Reliance Foundation Hospital, Mumbai, Maharashtra, 400004, India.

Purpose: Roof arc angle (RAA) is determined by measuring angle between a vertical line drawn from center of the acetabulum towards the acetabular dome and a second line drawn from center of acetabulum to the fracture through the acetabulum. Joel and Matta demonstrated that when roof arc angle was less than 45° on Pelvic AP and Judet's views, the fracture line is considered to be passing through the weight-bearing dome and require surgical fixation. The main purpose of the study is to calculate patient-specific angle and width for the better evaluation and management of acetabular fractures. Read More

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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy.

J Vis Exp 2021 Jul 2(173). Epub 2021 Jul 2.

Department of Orthopaedics, University of Utah; Scientific Computing and Imaging Institute, University of Utah; Department of Biomedical Engineering, University of Utah; Department of Physical Therapy, University of Utah;

Several hip pathologies have been attributed to abnormal morphology with an underlying assumption of aberrant biomechanics. However, structure-function relationships at the joint level remain challenging to quantify due to difficulties in accurately measuring dynamic joint motion. The soft tissue artifact errors inherent in optical skin marker motion capture are exacerbated by the depth of the hip joint within the body and the large mass of soft tissue surrounding the joint. Read More

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A New Method of Testing the Dynamic Deformation of Metals.

Materials (Basel) 2021 Jun 15;14(12). Epub 2021 Jun 15.

Department of Road Transport, Faculty of Transport and Aviation Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland.

This paper presents the characteristics of a modernized rotary hammer equipped with a new measuring system based on strain gauges for recording short-term signals. The stand makes it possible to carry out dynamic tensile and bending tests in the range of linear speed of the exciting element from 5 to 40 m/s. Initial tests of dynamic deformation and structural studies in the form of fractures carried out on a representative group of metallic materials allowed determining the correlation "strain rate-strain structure". Read More

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Sensor Integrated Load-Bearing Structures: Measuring Axis Extension with DIC-Based Transducers.

Sensors (Basel) 2021 Jun 15;21(12). Epub 2021 Jun 15.

Institute for Production Engineering and Forming Machines, Technical University of Darmstadt, 64287 Darmstadt, Germany.

In this paper we present a novel, cost-effective camera-based multi-axis force/torque sensor concept for integration into metallic load-bearing structures. A two-part pattern consisting of a directly incident and mirrored light beam is projected onto the imaging sensor surface. This allows the capturing of 3D displacements, occurring due to structure deformation under load in a single image. Read More

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Accuracy in the Execution of Pre-operative Plan for Limb Alignment and Implant Positioning in Robotic-arm Assisted Total Knee Arthroplasty and Manual Total Knee Arthroplasty: A Prospective Observational Study.

Indian J Orthop 2021 Aug 4;55(4):953-960. Epub 2021 Jan 4.

Department of Biostatistics, Amrita School of Medicine, Kochi, Kerala India.

Aim: The objective of the study is to compare the accuracy of implant positioning and limb alignment achieved in robotic-arm assisted total knee arthroplasty(RATKA) and manual total knee arthroplasty(MTKA) to their respective preoperative plan.

Patients And Methods: This was a prospective observational study conducted in a tertiary care centre between August 2018 and January 2020. 143 consecutive RATKA(105 patients) and 151 consecutive MTKA(111 patients) performed by two experienced arthroplasty surgeons were included. Read More

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Measuring Orthopedic Plate Strain to Track Bone Healing Using a Fluidic Sensor Read via Plain Radiography.

IEEE Trans Biomed Eng 2021 Jun 28;PP. Epub 2021 Jun 28.

Objective: We describe a fluidic X-ray visualized strain indicator under applied load (X-VISUAL) to quantify orthopedic plate strain and inform rehabilitative care.

Methods: The sensor comprises a polymeric device with a fluidic reservoir filled with a radio-dense fluid (cesium acetate) and an adjoining capillary wherein the liquid level is measured. A stainless-steel lever attaches to the plate and presses upon the acrylic bulb with a displacement proportional to plate bending strain. Read More

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A Robust Multiscale and Multiphasic Structure-Based Modeling Framework for the Intervertebral Disc.

Front Bioeng Biotechnol 2021 7;9:685799. Epub 2021 Jun 7.

Berkeley Biomechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA, United States.

A comprehensive understanding of multiscale and multiphasic intervertebral disc mechanics is crucial for designing advanced tissue engineered structures aiming to recapitulate native tissue behavior. The bovine caudal disc is a commonly used human disc analog due to its availability, large disc height and area, and similarities in biochemical and mechanical properties to the human disc. Because of challenges in directly measuring subtissue-level mechanics, such as fiber mechanics, finite element models have been widely employed in spinal biomechanics research. Read More

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The role of loading in murine models of rotator cuff disease.

J Orthop Res 2021 Jun 3. Epub 2021 Jun 3.

Department of Orthopaedic Surgery, Columbia University Irving Medical Center, New York, New York, USA.

Rotator cuff disease pathogenesis is associated with intrinsic (e.g., age, joint laxity, muscle weakness) and extrinsic (e. Read More

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Foundation Piles-A New Feature for Concrete 3D Printers.

Materials (Basel) 2021 May 13;14(10). Epub 2021 May 13.

Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Piastów 19, 70-310 Szczecin, Poland.

Foundation piles that are made by concrete 3D printers constitute a new alternative way of founding buildings constructed using incremental technology. We are currently observing very rapid development of incremental technology for the construction industry. The systems that are used for 3D printing with the application of construction materials make it possible to form permanent formwork for strip foundations, construct load-bearing walls and partition walls, and prefabricate elements, such as stairs, lintels, and ceilings. Read More

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Investigating the Microchannel Architectures Inside the Subchondral Bone in Relation to Estimated Hip Reaction Forces on the Human Femoral Head.

Calcif Tissue Int 2021 May 22. Epub 2021 May 22.

Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany.

The interplay between articular cartilage (AC) and subchondral bone (SB) plays a pivotal role in cartilage homeostasis and functionality. As direct connective pathways between the two are poorly understood, we examined the location-dependent characteristics of the 3D microchannel network within the SB that connects the basal cartilage layer to the bone marrow (i.e. Read More

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Addressing posterior tilt displacement during surgery to lower failure risk of sub-capital Garden types 1 and 2 femoral fractures.

Arch Orthop Trauma Surg 2021 May 6. Epub 2021 May 6.

Orthopedic Division, Department of Orthopedic Surgery, Affiliated with the Sackler Faculty of Medicine, Tel Aviv Medical Center, Tel Aviv University, 6 Weitzman St., 6423906, Tel Aviv, Israel.

Introduction: Sub-capital femoral fractures (SCFF) are impacted or non-displaced in Garden types 1 and 2, respectively. Non-surgical treatment is protected weight-bearing combined with physiotherapy and radiographic follow-up in selected patients. Traditionally, in situ pinning is the surgical treatment of choice. Read More

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Sphingomyelin liposome bearing whole lysate antigens induce strong Th2 immune response in BALB/c mice.

Iran J Basic Med Sci 2021 Feb;24(2):222-231

Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.

Objectives: Whole lysate antigens (WLL) has been shown to be effective to tackle leishmaniasis in murine models. Although liposomes can be considered as promising vaccines, the activity of phospholipase-A (PLA) in WLL, breeds difficulties to preparing stable liposomal WLL. One strategy to overcome this shortcoming is to use lipids such as sphingomyelin (SM) which is resistant against PLA. Read More

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February 2021

Measuring standing hindfoot alignment: reliability of different approaches in conventional x-ray and cone-beam CT.

Arch Orthop Trauma Surg 2021 Apr 22. Epub 2021 Apr 22.

Department of Orthopedics and Trauma Surgery, Albert-Ludwigs University Freiburg, Hugstetterstr. 55, 79106, Freiburg, Germany.

Introduction: Currently there is no consensus how hindfoot alignment (HA) should be assessed in CBCT scans. The aim of this study is to investigate how the reliability is affected by the anatomical structures chosen for the measurement.

Materials And Methods: Datasets consisting of a Saltzman View (SV) and a CBCT of the same foot were acquired prospectively and independently assessed by five raters regarding HA. Read More

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Estimating the flexural rigidity of Arabidopsis inflorescence stems: Free-vibration test vs. three-point bending test.

Plant Biotechnol (Tokyo) 2020 Dec;37(4):471-474

Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Ikoma, Nara 630-0192, Japan.

The mechanical strength of a plant stem (a load-bearing organ) helps the plant resist drooping, buckling and fracturing. We previously proposed a method for quickly evaluating the stiffness of an inflorescence stem in the model plant based on measuring its natural frequency in a free-vibration test. However, the relationship between the stiffness and flexural rigidity of inflorescence stems was unclear. Read More

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December 2020

Total knee arthroplasty in femoral bowing: does patient specific instrumentation have something to add? A randomized controlled trial.

BMC Musculoskelet Disord 2021 Apr 2;22(1):321. Epub 2021 Apr 2.

Department of Orthopaedic Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-Daero, Seocho-Gu, Seoul, 06591, Republic of Korea.

Background: Patient-specific instrumentation (PSI) proponents have suggested the benefits of improved component alignment and reduced outliers. In this randomized controlled trial, we attempted to assess the advantage of using PSI over conventional intermedullary (IM) guides for primary total knee arthroplasty (TKA) with bilateral severe femoral bowing (> 5°). A parallel trial design was used with 1:1 allocation. Read More

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Implementing fast-track in total hip arthroplasty: rapid mobilization with low need for pain medication and low pain values : Retrospective analysis of 102 consecutive patients.

Z Rheumatol 2021 Mar 11. Epub 2021 Mar 11.

Department of Orthopedics, University Medical Center Regensburg, Asklepios Klinikum Bad Abbach, Kaiser-Karl-V.-Allee 3, 93077, Bad Abbach, Germany.

Introduction: Total hip arthroplasty (THA) is reported to be one of the most painful surgical procedures. Perioperative management and rehabilitation patterns are of great importance for the success of the procedure. The aim of this cohort study was the evaluation of function, mobilization and pain scores during the inpatient stay (6 days postoperatively) and 4 weeks after fast-track THA. Read More

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Not as simple as it seems: Front foot contact kinetics, muscle function and ball release speed in cricket pace bowlers.

J Sports Sci 2021 Aug 9;39(16):1807-1815. Epub 2021 Mar 9.

Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia.

This study investigated the relationship between front foot contact (FFC) ground reaction forces (GRF) during the delivery stride, lower-limb strength, eccentric dexterity and power, and ball release speed (BRS) among pace bowlers. Thirteen high-level male pace bowlers performed double and single leg drop landings; isometric mid-thigh pull; countermovement jump; and pace bowling (two-over bowling spell measuring BRS and FFC GRF). The relationship between assessed variables and BRS was determined via frequentist and Bayesian multiple linear regression. Read More

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Microstructural and mechanical evaluations of region segmentation methods in classifications of osteonecrosis.

J Biomech 2021 04 28;119:110208. Epub 2020 Dec 28.

Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China. Electronic address:

Measuring the location of necrotic lesions is necessary to diagnosis of osteonecrosis. Different region segmentation methods of the femoral head were proposed to quantitatively measure necrotic lesions including Japanese Investigation Committee for Avascular Necrosis (JIC) classification and China-Japan Friendship Hospital (CJFH) classification. Biomechanical methods could bring important information to evaluate the reasonability of these classifications. Read More

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Measuring collagen fibril diameter with differential interference contrast microscopy.

J Struct Biol 2021 03 2;213(1):107697. Epub 2021 Feb 2.

Department of Bioengineering, Northeastern University, Boston, MA 02115, USA. Electronic address:

Collagen fibrils, linear arrangements of collagen monomers, 20-500 nm in diameter, comprising hundreds of molecules in their cross-section, are the fundamental structural unit in a variety of load-bearing tissues such as tendons, ligaments, skin, cornea, and bone. These fibrils often assemble into more complex structures, providing mechanical stability, strength, or toughness to the host tissue. Unfortunately, there is little information available on individual fibril dynamics, mechanics, growth, aggregation and remodeling because they are difficult to image using visible light as a probe. Read More

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Comparative Study of Anti-Gouty Arthritis Effects of Sam-Myo-Whan according to Extraction Solvents.

Plants (Basel) 2021 Feb 1;10(2). Epub 2021 Feb 1.

Herbal Medicine Research Division, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon 34054, Korea.

Sam-Myo-Whan (SMW) has been used in Korean and Chinese traditional medicine to help treat gout, by reducing swelling and inflammation and relieving pain. This study compared the effects of SMW extracted by using different solvents, water (SMWW) and 30% EtOH (SMWE), in the treatment of gouty arthritis. To this end, we analyzed the main components of SMWW and SMWE, using high-performance liquid chromatography (HPLC). Read More

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February 2021

Measuring femoral neck loads in healthy young and older adults during stair ascent and descent.

PLoS One 2021 26;16(1):e0245658. Epub 2021 Jan 26.

Department of Kinesiology, Iowa State University, Ames, IA, United States of America.

Understanding the hip loading environment for daily activities is useful for hip fracture prevention, rehabilitation, and the design of osteogenic exercises. Seventeen older adults (50-70 yrs) and twenty young adults (18-30 yrs) were recruited. A rigid body model combined with a musculoskeletal model was used to estimate lower extremity loading. Read More

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Corrosion and wear behaviour of highly porous Ti-TiB-TiN in situ composites in simulated physiological solution.

Authors:
Fatih Toptan

Turk J Chem 2020 1;44(3):805-816. Epub 2020 Jun 1.

CMEMS-UMinho - Center for Microelectromechanical Systems, University of Minho, Guimarães Portugal.

Highly porous Ti matrix composites can be a solution for some of the major clinical concerns for the load bearing implants such as low tribocorrosion resistance, stress shielding, and lack of biological anchorage. In order to respond to these needs, highly porous Ti-TiB-TiN in-situ composites were synthesized by pressureless sintering using BN as reactant and urea as space holder. Corrosion behaviour was investigated at body temperature, in phosphate buffer saline solution (PBS), by measuring open circuit potential (OCP) and cyclic polarization. Read More

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Effects of Combined Balance and Strength Training on Measures of Balance and Muscle Strength in Older Women With a History of Falls.

Front Physiol 2020 23;11:619016. Epub 2020 Dec 23.

Higher Institute of Sport and Physical Education, Ksar-said, University of Manouba, Manouba, Tunisia.

Objective: We investigated the effects of combined balance and strength training on measures of balance and muscle strength in older women with a history of falls.

Methods: Twenty-seven older women aged 70.4 ± 4. Read More

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December 2020