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Acta of Bioengineering and Biomechanics

Marcin Kotlarz, Rainer Jordan, Erik Wegener, Piotr Dobrzyński, Jörg Neunzehn, Albena Lederer, Cornelia Wolf-Brandstetter, Elżbieta Pamuła, Dieter Scharnweber
their surface properties. A main challenge in this area is the development of processing routes enabling for a simple but efficient surface design of complex shaped geometries. Against this background, this work aimed at the implementation of self-assembly principles for surface functionalization of 3D-printed poly(lactic-co-glycolic acid) (PLGA)-based constructs with macro- and microporous geometries via precision extruding deposition. METHODS: Three-component melts from PLGA, CaCO3 and amphiphilic polymers (poly(2-oxazoline) block copolymer) were printed and their bulk and surface properties were studied...
2018: Acta of Bioengineering and Biomechanics
Noha Mahmoud Youssef, Azza Mohammed Abdelmohsen, Ahmed Atteya Ashour, Naglaa Mohamed Elhafez, Salam Mohamed Elhafez
BACKGROUND: Chronic ankle instability (CAI) is a common sequence of ankle sprain. Conservative treatment of CAI is currently accepted as a primary mean of managing the condition and preventing of recurrence. OBJECTIVES: The purpose of the current study was to evaluate the effect of Weight-bearing Exercise for Better Balance (WEBB) program and unilateral balance training exercises on postural control in females with CAI. METHODS: Thirty-five females with CAI participated in this study...
2018: Acta of Bioengineering and Biomechanics
Qichang Mei, Yaodong Gu, Dong Sun, Justin Fernandez
PURPOSE: Prolonged running has been popularized globally in recent decades. This study was aimed to reveal information about foot morphology, shoe comfort and plantar loading among recreational heel-strike runners. METHODS: Twenty-six runners participated in foot morphology, perceived scores and peak pressure tests after 10- and 20-km track running. The foot morphology was measured using a 3D foot scanner, perceived scores were recorded using a visual analogue scale and plantar pressure was measured via insole plantar pressure measurement system...
2018: Acta of Bioengineering and Biomechanics
Marta Nycz, Ewa Paradowska, Katarzyna Arkusz, Bartosz Kudliński, Elżbieta Krasicka-Cydzik
PURPOSE: The vascular cannulation is associated with a number of complications. The aim of this work was to study the composition and distribution of the film covering the surfaces of Mahurkar Maxid and Palindrome catheters, which were removed from the body of long-term hemodialysis patients. Moreover, the roughness and contact angle of the catheters were evaluated. METHODS: Two brand new (as a reference) and thirty used catheters were the subject of the study. Their implantation period lasted from 4 months to a year and the reason for removal was the production of another vascular access or obstruction...
2018: Acta of Bioengineering and Biomechanics
Shih-Chieh Yang, Pao-Hsin Liu, Yuan-Kun Tu
PURPOSE: The conventional screw is unable to provide enough screw-bone interface strength for osteoporotic cencellous bone, and complications resulting from loosening or failure of the implants remain a significant clinical problem. Hence, the purpose of this study is to investigate pullout strength and energy in three types of the pedicle screws, including conventional solid pedicle screw, cannulated pedicle screw, and cannulated pedicle screw with a central pin, using osteoporotic sawbone test block with different bone cement volumes through pullout force testing...
2018: Acta of Bioengineering and Biomechanics
Robert Walaszek, Wiesław Chwała, Katarzyna Walaszek, Marcin Burdacki
PURPOSE: The purpose of this work was to assess the differences of the values of body posture indices, measured with the Moire's method, between girls and boys aged 13 and the relationships of these values with the results of the Y-Balance Test. METHODS: The study involved a group of healthy volunteers attending junior high schools in Cracow. The group consisted of 20 girls and 35 boys. Basic somatic parameters were measured within this work: body height and weight...
2018: Acta of Bioengineering and Biomechanics
Jacek Wąsik, Dorota Ortenburger, Tomasz Góra, Gongbing Shan, Dariusz Mosler, Piotr Wodarski, Robert A Michnik
PURPOSE: The current study aimed to quantify the main influences and the interactions (joint effects) of gender, leg and type of target on the biomechanics of front kick quality. Through the quantification, we tried to identify the relevant factors related to the kick accuracy and maximum velocity for coaching practice. METHODS: A ten-camera NIR VICON MX40 motion capture system (250 Hz) was used to determine the kicking foot maximum velocity from two well-trained subject groups (8 males and 6 females)...
2018: Acta of Bioengineering and Biomechanics
Carolin Gabler, Susann Gierschner, Thomas Tischer, Rainer Bader
PURPOSE: Tendon injury is an increasing problem in orthopedic and trauma surgery due to aging of the population and increased activity demands. Many rodent animal models are used in order to evaluate tendon reconstruction. Although tendon reruptures are a well- -known clinical problem, the outcomes of tendon repair in animal models are rarely discussed in the literature. The goal of the present experimental study was to compare the primary fixation stability of three suture techniques for repair of Achilles tendon defects in a rat model using a collagen scaffold...
2018: Acta of Bioengineering and Biomechanics
Elżbieta Szczygieł, Katarzyna Kotla, Agata Masłoń, Joanna Golec, Dorota Czechowska, Robert Staszkiewicz, Emilia Krzywda, Edward Golec
PURPOSE: The assessment of hip joint abductor muscle strength is most often carried out using a dynamometric test. However, both in clinical practice and literature, evaluation is performed by means of the single-leg half-squat or the amount of abduction movements performed in the hip joint. In this context, the question arises whether the results of individual tests are convergent. The aim of the study is to evaluate the relationship between strength of the hip abductor muscle measured by dynamometer, the single-leg-squat and the number of repetitions of the movements in time...
2018: Acta of Bioengineering and Biomechanics
Krzysztof Buśko, Michał Górski, Pantelis Theodoros Nikolaidis, Joanna Mazur-Różycka, Patrycja Łach, Zbigniew Staniak, Jan Gajewski
PURPOSE: The main goal of the present study was to examine muscle strength and power of dominant and non-dominant leg, knee extensors and flexors, and their correlations with jumping performances in soccer players. A secondary aim was to evaluate muscle sense. METHODS: 31 male professional strikers (age 20.9 ± 2.3 years, body mass 75.1 ± 6.6 kg, body height 179.5 ± 4.7 cm) participated in the study. The power output of lower extremities and the height of rise of the body mass centre during vertical jumps were measured using a force plate...
2018: Acta of Bioengineering and Biomechanics
Magdalena Wojtków, Klaudia Szkoda-Poliszuk, Sylwia Szotek
Young school-age children are particularly prone to postural defects because they are in a period of development of the spine that is exposed to a number of factors impairing its normal growth. A change in the shape of the spinal column causes a shift in the centre of gravity. Therefore, this study attempted to assess the influence of body posture on distribution of the load transferred by the lower limbs. METHODS: For each of the examined children, this study determined the parameters describing the body posture with the use of the photogrammetric method and the parameters describing plantar force distribution...
2018: Acta of Bioengineering and Biomechanics
Agnieszka Guzik, Mariusz Drużbicki, Grzegorz Przysada, Magdalena Szczepanik, Katarzyna Bazarnik-Mucha, Andrzej Kwolek
PURPOSE: The Gait Variability Index (GVI) summarizes overall gait quality, taking into account spatiotemporal parameters from a 3-dimensional gait analysis. However, there are no studies evaluating changes in gait patterns after stroke, based on the GVI. The study was designed to assess usefulness of the GVI for evaluation of gait pathology in subjects with stroke, compared to healthy individuals. METHODS: Spatiotemporal gait parameters were examined in a group of 50 subjects at a chronic stage post-stroke and in 50 healthy controls...
2018: Acta of Bioengineering and Biomechanics
Jarosław Omorczyk, Przemysław Bujas, Ewa Puszczałowska-Lizis, Leon Biskup
PURPOSE: The aim of this study was to compare and analyse of relationships between stability indices registered in two positions: standing and handstand in athletes practicing gymnastics at various levels of advancement. METHODS: The study included 46 athletes practicing gymnastics. The research tool was posturograph CQ-Stab 2P. RESULTS: In both standing position and handstand in the seniors there were statistically significantly lower values of such indicators as: sway area delimited by the center of pressure ( p = 0...
2018: Acta of Bioengineering and Biomechanics
Katarzyna Gruszka, Edyta Szczuka, Ireneusz Całkosiński, Krzysztof A Sobiech, Agnieszka Chwałczyńska
PURPOSE: Among thermal stimulation treatments that have a beneficial effect on the human body general application of cold and various forms of massage are mentioned which can be assessed by means of thermovision analysis. The aim of the study was to evaluate changes in the distribution of surface body temperature under the influence of whole-body cryostimulation, classical massage and hot stone massage. MATERIALS AND METHODS: The study was conducted on a group of 40 men aged 20-24 years...
2018: Acta of Bioengineering and Biomechanics
Mehtap Demirel, Bunyamin Aksakal
Porous and alternative biografts for possible usages in orthopaedic applications were synthesized by the substitution of gelatin (G), cuttlefish backbone (C), meerschaum sepiolite (S) and hydroxyapatite (H). The effects of different proportions of the Gelatin substitutions on the mechanical properties and structure and cell viability properties of the fabricated biografts were investigated. Throughout the structure and mechanical evaluations, it was found that Gelatin substitution in the fabricated biografts increased the total porosity fraction, particularly for C13G75 and S13G75 biografts...
2018: Acta of Bioengineering and Biomechanics
Peng Su, D A Lu, Shijing Deng, Leiyu Zhang, Yuxin Hao, Yang Yang
PURPOSE: Trephination is one of the basic operations of keratoplasty, and the biomechanical mechanism of the operation can be revealed based on three-dimensional modeling and simulation of trephine cutting cornea. METHODS: Based on the analysis of the physical and biomechanical characteristics of corneal trephination, a three-dimensional numerical model of corneal trephination is built, where the cornea can be simplified to two layers structure including stroma and epithelium, and the trephine cuts the cornea under the vertical motion load and the rotational motion load...
2018: Acta of Bioengineering and Biomechanics
Dongyan Zhong, X I Chen, Wen Zhang, Zong-Ping Luo
PURPOSE: Chondrocyte extracellular matrix type II collagen and proteoglycans ensure an important compression-bearing structure in synovial joint. However, much more type I collagen is generated in osteoarthritis, which implies the presence of abnormal tensile strain in cartilage. We hypothesize that tensile stress influences chondrocyte phenotype at the cellular level, leading to potential osteoarthritis. METHODS: Chondrocytes were stimulated with cyclic excessive tensile (10%) or mild tensile or compressive strain (5%) at 0...
2018: Acta of Bioengineering and Biomechanics
Agnieszka Opala-Berdzik, Magdalena Głowacka, Krzysztof Wilusz, Patrycja Kołacz, Krzysztof Szydło, Grzegorz Juras
PURPOSE: The aim of the study was to determine whether 10- to 13-year-old, national-level, female acrobatic gymnasts present a different quiet standing postural control (with and without visual cues) than untrained female peers. METHODS: The mean velocity of the center of pressure (in anterior-posterior and medial-lateral directions) was computed from 60-s long quiet-standing trials on a stationary force plate in fifteen 10- to 13-year-old female acrobatic gymnasts and thirteen sex- and age-matched non-athletes...
2018: Acta of Bioengineering and Biomechanics
Rafał Rój, Grzegorz Chladek, Magdalena Wyszyńska, Tadeusz Morawiec, Jacek Kasperski
INTRODUCTION: Multifactorial aetiologies of painful temporomandibular disorders (TMD) have an impact on correct diagnosis and consequently prevent proper treatment. AIM OF THE STUDY: The aim of the study was to evaluate the effect of magnetic stimulation on electromyographic activity in temporal muscles and masseters in patients using occlusal splints. MATERIALS AND METHODS: The examined group consisted of 40 edentulous patients with TMD. The patients were examined based on Helkimo Index...
2018: Acta of Bioengineering and Biomechanics
Katarzyna Arkusz, Tomasz Klekiel, Niezgoda Niezgoda, Romuald Będziński
PURPOSE: The aim of this study was to determine the effect of bone mineral density (BMD) on the stress distribution in pelvic-hip complex (PHC) model which included bone structures and soft tissues. Bone mass changes in osteoporosis and osteopenia were considered in this analysis. In addition, the relations between force direction and stress distribution causing PHC fractures were determined. METHODS: This paper presents the development and validation of a detailed 3D finite element model with high anatomical fidelity of the PHC and BMD changes in trabecular and cortical bones, modelled based on CT scans...
2018: Acta of Bioengineering and Biomechanics
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