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Acta of Bioengineering and Biomechanics

Alicja Rapacz-Kmita Rapacz-Kmita, Małgorzata Karolina Pierchała, Anna Tomas-Trybuś, Barbara Szaraniec, Janusz Karwot
The aim of this study was to evaluate the effect of the not activated (unmodified) montmorillonite (MMT) filler on the antibacterial properties of polymer nanocomposites with a biodegradable polylactide (PLA) matrix. The subject of research was selected to verify the reports on the lack of antibacterial properties of unmodified montmorillonite in nanocomposites and to investigate the potential conditions of their manufacturing which are decisive for the resulting properties. Evaluation of antibacterial and mechanical properties of both the starting materials and the obtained nanocomposites filled with layered silicates as well as the wettability of the materials, measured by a sitting drop method was made on samples in the form of a film...
2017: Acta of Bioengineering and Biomechanics
Jacek Jurkojć, Piotr Wodarski, Robert A Michnik, Andrzej Bieniek, Marek Gzik, Arkadiusz Granek
PURPOSE: Indexing methods are very popular in terms of determining the degree of disability associated with motor dysfunctions. Currently, indexing methods dedicated to the upper limbs are not very popular, probably due to difficulties in their interpretation. This work presents the calculation algorithm of new SDDI index and the attempt is made to determine the level of physical dysfunction along with description of its kind, based on the interpretation of the calculation results of SDDI and PULMI indices...
2017: Acta of Bioengineering and Biomechanics
Radosław Stempin, Szymon Łukasz Dragan, Mirosław Kulej, Jarosław Filipiak, Szymon Dragan
Hip resurfacing surgery is a matter of controversy. Some authors present very good late results of 99% survival outcomes. However, national records of implants point to the series of complications connected with biomechanical flaws of the implant. These results implicate the experimental research on biomechanical properties of HRS. The aim of the research was to define the nature of cooperation between the components of hip resurfacing surgery (HRS) and the influence of the deformation of acetabulum, the size of the implant and the nature of the bone surface on the stress distribution in the acetabulum and the femoral component...
2017: Acta of Bioengineering and Biomechanics
Mikolaj Przydacz, Wally Mahfouz, Oleg Loutochin, Chiara E Ghezz, Maude Carmel, Jacques Corcos
PURPOSE: Mid-urethral slings have become the gold standard treatment of stress urinary incontinence in women. Their tensile properties should be evaluated in order to measure how they wear off with time. Our objective was a long-term assessment of the tensile properties of 2 synthetic tapes (TVT-O and I-STOP) after in vivo implantation in rats in terms of elastic modulus. METHODS: Strips from both meshes were implanted in the abdominal wall of 30 rats, which were sacrificed at 5 time intervals...
2017: Acta of Bioengineering and Biomechanics
Robert Michnik, Katarzyna Nowakowska, Jacek Jurkojć, Katarzyna Jochymczyk-Woźniak, Ilona Kopyta
PURPOSE: The aim of the research was to determine the energy changes during the gait cycle for a group of healthy children and a group of patients with cerebral palsy, and to compare the value of energy expenditure (EE) with the determined values of the Gillette Gait Index (GGI) and the Gait Deviation Index (GDI). METHODS: The study group consisted of 56 children with regular gait and 56 patients with diagnosed cerebral palsy (CP). The gait kinematics was determined by BTS Smart System...
2017: Acta of Bioengineering and Biomechanics
Tadeusz Ambroży, Anna Mazur-Rylska, Wiesław Chwała, Dorota Ambroży, Teresa Mucha, Jarosław Omorczyk, Andrzej Ostrowski, Dariusz Mucha
PURPOSE: Maintaining balance in humans involves continuous changes in parameters. The aim of this study was to assess the effect of hippotherapeutic exercises on development of the sense of balance in boys aged 15 to 17 years with mild intellectual disability. METHODS: The study examined 50 randomly chosen boys aged 15 to 17 years with mild intellectual disability from the special education centre in Leżajsk, Poland. The study participants were divided into two groups: experimental group, who participated for 3 months in hippotherapeutic classes and the control group, with boys attending outdoor or indoor physical education classes...
2017: Acta of Bioengineering and Biomechanics
Anita Kajzer, Ola Grzeszczuk, Wojciech Kajzer, Katarzyna Nowińska, Marcin Kaczmarek, Michał Tarnowski, Tadeusz Wierzchoń
PURPOSE: The paper presents the results of physicochemical and mechanical properties of the Ti-6Al-7Nb alloy with surface modified by formation of a diffusive nitrocarburized layer deposited in a low-temperature plasma process. The main aim of the study was to evaluate the influence of steam sterilization and exposure to Ringer's solution on the utility properties of the alloy. METHODS: Based on the study of the microstructure, roughness, wettability, resistance to pitting corrosion, ion infiltration and mechanical properties, the usefulness of the proposed method of surface treatment for clinical application was proven...
2017: Acta of Bioengineering and Biomechanics
Jeanne Bertuit, Clara Leyh, Marcel Rooze, Véronique Feipe
PURPOSE: Physical and hormonal modifications occuring during the pregnancy, can lead to an increase in postural instability and to a higher risk of falls during gait. The first objective was to describe the center of pressure (COP) during late pregnancy at different gait velocity. Comparison of nulliparous women with postpartum women were conducted in order to investigate the effects of pregnancy. The second objective was to analyse COP variability between pregnant and non-pregnant women in order to investigate the effects of pregnancy on gait variability...
2017: Acta of Bioengineering and Biomechanics
Miroslav Janura, Lucia Bizovska, Zdenek Svoboda, Martin Cerny, Erika Zemkova
PURPOSE: The aim of the study was to determine whether it is possible to assess static balance on an unstable surface using center of pressure velocities obtained with a force platform when standing on a wobble board. METHODS: The center of pressure velocities were recorded with a force platform within three days (four trials per day) in thirty young adults in three conditions: standing on a rigid surface, compliant surface, and on a wobble board. Reliability of mean velocities of the center of pressure was examined using intraclass correlation coefficients...
2017: Acta of Bioengineering and Biomechanics
Ghias Kharmanda, Abdallah Shokry, Mohamed Y Kharma
PURPOSE: The objective was to assess the reliability level of mini-plate fixation used in fracture mandibles in order to evaluate the structure stability in both convalescence and healing periods. METHODS: In the convalescence period, the failure scenario is measured by the relative displacement between two fracture surfaces which should not exceed an acceptable value in order to obtain a good stability for rapid bone healing and to limit any trauma. However, in the healing period, it is the objective to obtain an acceptable rigidity...
2017: Acta of Bioengineering and Biomechanics
Gerardo Presbítero, Marco A L Hernandez-Rodríguez, Geo R Contreras-Hernandez, José Félix Vilchez, Orlando Susarrey, David Gutiérrez
PURPOSE: Although significant differences in bone properties have been extensively studied, results vary when bones are exported to gamma radiation of a range usually used for sterilization purposes (25-35 kGy). Hence, the aim of this work was the study of the mechanical properties and microdamage development of human bones used as allografts following gamma-ray exposure, followed by an extensive statistical analysis of microdamage effects in fatigue behaviour. METHODS: Specimens of the cortical region of human femurs were exposed to 15-25 kGy and 26-30 kGy radiation levels, then they were subjected to compression fatigue tests until fracture...
2017: Acta of Bioengineering and Biomechanics
Ertuğrul Bulbul, Bunyamin Aksakal
Laser-treated Ti6Al4V surfaces were coated by the single-layer hydroxyapatite (HA) and double-layer hydroxyapatite reinforced by the reduced nano-graphene oxide (rGO) using the sol-gel method. The effects of rGO reinforcement at different ratios and sintering temperatures on surface morphology and adhesion strength of the single and double layer coatings (rGO/HA) were analysed. As the initial treatment process, a laser texturing was patterned on the alloy and then, prepared samples were coated. The coated laser-modified HA and HA/rGO-coated Ti6Al4V surfaces were characterized by Raman spectroscopy, X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and the adhesion strength between the coat and substrates were determined by the standard adhesion tests...
2017: Acta of Bioengineering and Biomechanics
Jan Novotny, Silvie Rybarova, Dan Zacha, Jan Jr Novotny, Martina Bernacikova, Wael Ramadan
PURPOSE: The information about the workload on individual muscles in the course of a specific physical activity is essential for targeted prevention, early diagnosis and suitable therapy concerning their overloading and injury. The aim of this study is to evaluate temperature changes in particular skin areas in the course of front crawl swimming, caused by muscle work. METHODS: Thermograms were taken of 13 students of Defense University immediately and 15 minutes after swimming 1,000 m focused on 20 regions of the skin over the selected agonists and synergists in upper extremities and body...
2017: Acta of Bioengineering and Biomechanics
Hector E Jaramillo, Jose J Garcia
PURPOSE: A probabilistic finite element (FE) analysis of the L4-L5 and L5-S1 human annulus fibrosus (AF) was conducted to obtain a better understanding of the biomechanics of the AF and to quantify its influence on the range of motion (ROM) of the L4-L5 and L5-S1 segments. METHODS: The FE models were composed of the AF and the upper and lower endplates. The AF was represented as a continuous material composed of a hyperelastic isotropic Yeoh matrix reinforced with two families of fibers described with an exponential energy function...
2017: Acta of Bioengineering and Biomechanics
Magdalena Wojtków, Anna Nikodem
PURPOSE: The aim of this study is to evaluate the influence of the swimming speed during diving on the biomechanical parameters describing the movement of selected measurement points of the lower limb in professional divers. METHODS: The study involved a group of 4 professional divers whose movement was recorded during underwater swimming at slow (approx. 0.4 m·s-1), medium (approx. 0.5 m·s-1), and fast (approx. 0.8 m·s-1) pace. RESULTS: During swimming at medium speed, the divers made a smaller displacement (along the axes Y) of the midpoint of fin than during swimming at fast speed...
2017: Acta of Bioengineering and Biomechanics
Jacek Wilczyński, Agnieszka Pedrycz, Ewa Zieliński, Tadeusz Ambroży, Dariusz Mucha
PURPOSE: The aim of the study was to analyze postural stability in Parkinson's disease patients. A total of 32 subjects were tested, including 26 (81.25%) women and 6 (18.75%) men. These were patients with advanced, idiopathic Parkinson's disease. The disease duration was over 5 years. METHODS: The study was conducted in the Posturology Laboratory at the Department of Medicine and Health Sciences, Jan Kochanowski University in Kielce (Poland). The Biodex Balance System was used for evaluation of postural stability...
2017: Acta of Bioengineering and Biomechanics
Adam M Szulc, Krzysztof Buśko, Elżbieta Sandurska, Michał Kołodziejczyk
PURPOSE: The aim of this study was to examine the differences in body composition, strength and power of lower limbs, height of jump measured for the akimbo counter movement jumps, counter movement jump and spike jumps between deaf and hearing elite female soccer players. METHODS: Twenty deaf (age: 23.7±5.0 years, hearing loss: 96±13.9 dB) and 25 hearing (age: 20.3±3.8 years) participated in the study. Their WHR and BMI were calculated. Body fat was measured using the BIA method...
2017: Acta of Bioengineering and Biomechanics
Thilo Floerkemeier, Fritz Thorey, Mathias Wellmann, Christof Hurschler, Stefan Budde, Henning Windhagen
PURPOSE: One of the problems associated with callus distraction is a long time period needed for consolidation of the newly formed bone. The goal of this study was to determine whether percutaneous injections of rhBMP 2 in αBSM would enhance bone consolidation. METHODS: A unilateral tibial osteotomy combined with external stabilization was performed in 20 adult sheep. After a latency of four days, distraction was conducted for 20 days. Sheep were divided into three groups: group 1 received rhBMP-2/αBSM injections at day 23 and 30, group 2 buffer/αBSM injections at day 23 and 30 and group 3 did not receive any injection...
2017: Acta of Bioengineering and Biomechanics
Axaule Mamaeva, Aidar Kenzhegulov, Piotr Kowalewski, Wojciech Wieleba
A biocompatible hydroxyapatite (HA) coating with a thickness of about 18-20 microns was successfully deposited by radiofrequency (RF) magnetron sputtering on titanium substrates VT1-0. The data obtained for the optimal composition and structure of hydroxyapatite can be used to create coating which will interact with a titanium substrate. Using the methods of optical and SEM, AFM, electron microprobe, FTIR and X-ray analysis, surface morphology, phase and elemental composition, structure of hydroxyapatite (HA) coatings were studied...
2017: Acta of Bioengineering and Biomechanics
Jana Hornová, Aleš Iglič, Veronika Kralj-Iglič, Douglas R Pedersen, Matej Daniel
PURPOSE: Estimation of hip joint loading is fundamental for understanding joint function, injury and disease. To predict patientspecific hip loading, a musculoskeletal model must be adapted to the patient's unique geometry. By far the most common and cost effective clinical images are whole pelvis plain radiographs. This study compared the accuracy of anisotropic and isotropic scaling of musculoskeletal model to hip joint force prediction by taking patient-specific bone geometry from standard anteroposterior radiograms...
2017: Acta of Bioengineering and Biomechanics
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