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Acta of Bioengineering and Biomechanics

Ryszard Maroński
PURPOSE: The problem of optimal strategy in cancer chemotherapy is reconsidered. Two incompatible goals should be completed: the number of cancer cells in the patient's body should be reduced and the toxic effect of the therapy should be minimized. Such problem may be formulated in optimal control. The control function is the amount of the drug administered in the time unit. METHODS: The Malthusian model of cell population growth is employed where the rate of increase of the number of cancer cells is proportional to the number of cells in population and an intrinsic rate that usually is assumed to be constant...
2017: Acta of Bioengineering and Biomechanics
Janusz Szewczenko, Wojciech Kajzer, Magdalena Grygiel-Pradelok, Joanna Jaworska, Katarzyna Jelonek, Katarzyna Nowińska, Maria Gawliczek, Marcin Libera, Andrzej Marcinkowski, Janusz Kasperczyk
The aim of the study was to determine the influence of PLGA bioresorbable polymer coating on corrosion resistance of metal biomaterial. Polymer coating deposited by immersion method was applied. Corrosion resistance of metal biomaterials (stainless steel, Ti6Al4V, Ti6Al7Nb) coated with PLGA polymer, after 90 days exposure to Ringer's solution was tested. The amount of metal ions released to the solution was also investigated (inductively coupled plasma-atomic emission spectrometry (ICP-AES) method). The surface of the samples was observed using atomic force microscopy (AFM) and scanning electron microscopy (SEM)...
2017: Acta of Bioengineering and Biomechanics
Joanna Ryniewicz, Wojciech I Ryniewicz, Jolanta E Loster, Aneta Wieczorek, Jolanta Pytko-Polończyk
of this study was to analyze the effects of carbon dioxide (CO2) laser light on the structure and elemental composition of dentine. METHODS: The evaluation was conducted on samples from extracted teeth. The surface of the dentine was exposed to the radiation from a CTL 1401 CO2 laser (Centre of Laser Technology, Poland). The radiation and frequency parameters were as follows: group I with 5 W and 1 Hz, group II with 10 W and 1 Hz, group III with 5 W and 5 Hz, and group IV with 10 W and 5 Hz...
2017: Acta of Bioengineering and Biomechanics
Tomasz Andrzejewski, Piotr Czarnecki, Mikołaj Dąbrowski, Robert Spławski, Piotr Rogala, Leszek Romanowski
PURPOSE: Flexor injuries are most common in the hand and require special attention and experience from the surgeon. Both quality and technique affect the stability of the suture. The selection of the optimum method will influence the process of rehabilitation. The aim of this study was to compare three different suture techniques based on the strength, depending on the method of breakage, i.e., axial or pulley load. METHODS: The study was divided into six sessions...
2017: Acta of Bioengineering and Biomechanics
Krystyna Pethe-Kania, Józef A Opara, Dariusz Kania, Zenon Kidoń, Tomasz Łukaszewicz
PURPOSE: Presentation of the results of clinical study on new supplementary method applied in the physical rehabilitation of patients who underwent total hip arthroplasty. The standard rehabilitation program was supplemented with the lower limb loading symmetry training based on the follow-up posturography with an adaptively modified visual biofeedback, performed on a double plate posturographic platform. METHODS: The research involved 60 randomly selected patients included in prospective and comparative clinical study in the scheme of the parallel groups...
2017: Acta of Bioengineering and Biomechanics
Dominika Gawlak, Katarzyna Mańka-Malara, Elżbieta Mierzwińska-Nastalska, Roman Gieleta, Tomasz Kamiński, Magdalena Łuniewska
PURPOSE: The essential function of mouthguards is protection against the effects of injuries sustained during sports activities. This purpose will be successfully achieved if appropriate materials ensuring sufficient reduction of the injury force are used for mouthguard fabrication. OBJECTIVE: The objective of the study was to investigate the force reduction capability of selected materials as well as to identify which material reduces the impact force to the highest degree...
2017: Acta of Bioengineering and Biomechanics
Katarzyna Barczyk-Pawelec, Wioletta Dziubek, Jerzy R Piechura, Krystyna Rożek
BACKGROUND: Evaluation of body posture and strength of spinal muscles in children during their progressive ontogenesis is significant for the evaluation of their physical health condition and physical fitness. It is also a reference point in a process of control and medical care. PURPOSE: The aim if this study was to evaluate correlation between the selected features of somatic body structure, shape of anteroposterior spinal curves and force-velocity (FV) parameters of trunk muscles in school children...
2017: Acta of Bioengineering and Biomechanics
Mário J Costa, Tiago M Barbosa, Jorge E Morais, Sérgio Miranda, Daniel A Marinho
PURPOSE: The biomechanical adaptations in front crawl and backstroke swimming, as influenced by the implementation of a concurrent teaching programme were analysed. METHODS: Sixteen participants (19.75 ± 1.13 years) underwent a 30 weeks intervention characterized by an increasing complexity to accomplish motor skills in the following order: (i) lower limbs propulsion; (ii) lower limbs propulsion synchronized with breathing cycle; (iii) lower limbs propulsion synchronized with one upper limb action; (iv) lower limbs propulsion synchronized with both breathing cycle and one upper limb action; (v) full swimming stroke; (vi) motor trajectory of the arms stroke...
2017: Acta of Bioengineering and Biomechanics
Jiri Marvan, Zdenek Horak, Miloslav Vilimek, Lukas Horny, David Kachlik, Vaclav Baca
Ankle fractures are complex injuries with variable prognoses that depend upon many factors. The aim of the treatment is to restore the ankle joint biomechanical stability with maximum range of motion. Most ankle fractures are fibular fractures, which have a typical oblique fracture line in the distal fibula located in the area of the tibiofibular syndesmosis. The aim of this study was to simulate numerically several fixation techniques of the distal fibular fractures, evaluate their stability, determine their impact on surrounding tissue load, and correlate the results to clinical treatment experience...
2017: Acta of Bioengineering and Biomechanics
V Phanindra Bogu, Y Ravi Kumar, Asit Kumar Khanara
PURPOSE: This computational study explores modelling and finite element study of the implant under Intracranial pressure (ICP) conditions with normal ICP range (7 mm Hg to 15 mm Hg) or increased ICP (>I5 mm Hg). The implant fixation points allow implant behaviour with respect to intracranial pressure conditions. However, increased fixation points lead to variation in deformation and equivalent stress. Finite element analysis is providing a valuable insight to know the deformation and equivalent stress...
2017: Acta of Bioengineering and Biomechanics
Jikun Wang, Teresa Zielińska
PURPOSE: The aim of this paper is to provide the methods for automatic detection of the difference in gait features depending on a footwear. METHODS: Artificial neural networks were applied in the study. The gait data were recorded during the walk with different footwear for testing and validation of the proposed method. The gait properties were analyzed considering EMG (electromyography) signals and using two types of artificial neural networks: the learning vector quantization (LVQ) classifying network, and the clustering competitive network...
2017: Acta of Bioengineering and Biomechanics
Waqas A Lughmani, Farukh Farukh, Kaddour Bouazza-Marouf, Hassan Ali
PURPOSE: Bone drilling is a major part of orthopaedic surgery performed during the internal fixation of fractured bones. At present, information related to drilling force, drilling torque, rate of drill-bit penetration and drill-bit rotational speed is not available to orthopaedic surgeons, clinicians and researchers as bone drilling is performed manually. METHODS: This study demonstrates that bone drilling force data if recorded in-vivo, during the repair of bone fractures, can provide information about the quality of the bone...
2017: Acta of Bioengineering and Biomechanics
Liliam F Oliveira, Debora Verneque, Luciano L Menegaldo
PURPOSE: Physiological cross-sectional area (PCSA) reduction of the triceps surae (TS) muscles during aging suggests a proportional loss of torque among its components: soleus, medial and lateral gastrocnemii. However, direct measurements of muscle forces in vivo are not feasible. The purpose of this paper was to compare, between older and young women, isometric ankle joint torque sharing patterns among TS muscles and tibialis anterior (TA). METHODS: An EMG-driven model was used for estimating individual muscle torque contributions to the total plantar flexor torque, during sustained contractions of 10% and 40% of maximum voluntary contraction (MVC)...
2017: Acta of Bioengineering and Biomechanics
Thilo Floerkemeier, Stefan Budde, Christof Hurschler, Gabriela Lewinski, Henning Windhagen, Jens Gronewold
PURPOSE: The number of primary total hip arthroplasties (THA) is steadily increasing. Over the last decade numerous so-called short stem hip arthroplasties were introduced on the market. The aim of these implants with a predominantly metaphyseal anchorage is to reduce stress shielding and thereby the risk of aseptic loosening. One of the short stem arthroplasties with predominant metaphyseal fixation is the METHA® short stem (Aesculap, Tuttlingen, Germany). In order to reconstruct the biomechanics the METHA stem is available in different sizes with different centrum-collum-diaphysis-angles (CCD-angle)...
2017: Acta of Bioengineering and Biomechanics
Xiaofei Xiao, Weiya Hao, Xuhong Li, Bingjun Wan, Gongbing Shan
PURPOSE: About 70% injury of gymnasts happened during landing - an interaction between gymnast and landing mat. The most injured joint is the ankle. The current study examined the effect of mechanical properties of landing mat on ankle loading with aims to identify means of decreasing the risk of ankle injury. METHOD: Gymnastic skill - salto backward stretched with 3/2 twist was captured by two high-speed camcorders and digitized by using SIMI-Motion software. A subject-specific, 14-segment rigid-body model and a mechanical landing-mat model were built using BRG...
2017: Acta of Bioengineering and Biomechanics
Carla F Santos, Jorge Belinha, Fernanda Gentil, Marco Parente, Renato N Jorge
PURPOSE: The vestibular system is the part of the inner ear responsible for balance. Vertigo and dizziness are generally caused by vestibular disorders and are very common symptoms in people over 60 years old. One of the most efficient treatments at the moment is vestibular rehabilitation, permitting to improve the symptoms. However, this rehabilitation therapy is a highly empirical process, which needs to be enhanced and better understood. METHODS: This work studies the vestibular system using an alternative computational approach...
2017: Acta of Bioengineering and Biomechanics
Włodzimierz S Erdmann, Vassilis Giovanis, Piotr Aschenbrenner, Vaios Kiriakis, Andrzej Suchanowski
PURPOSE: This paper aims at the description and comparison of methods of topographic analysis of racing courses at all disciplines of alpine skiing sports for the purposes of obtaining: terrain geomorphology (snowless and with snow), course geometry, and competitors' runs. METHODS: The review presents specific methods and instruments according to the order of their historical appearance as follows: (1) azimuth method with the use of a compass, tape and goniometer instruments; (2) optical method with geodetic theodolite, laser and photocells; (3) triangulation method with the aid of a tape and goniometer; (4) image method with the use of video cameras; (5) differential global positioning system and carrier phase global positioning system methods...
2017: Acta of Bioengineering and Biomechanics
Izabela M Barszczewska-Rybarek, Anna Korytkowska-Wałach, Małgorzata Kurcok, Grzegorz Chladek, Jacek Kasperski
PURPOSE: This paper presents the study aimed at the development of crosslinked poly(methyl methacrylate)s (X-PMMA) of varied crosslink density and the investigation of the relationships between the polymer network structure and dynamic mechanical properties. METHODS: A series of model X-PMMA networks were crosslinked by the introduction of: 1, 2, 5, 10 and 20% of triethylene glycol dimethacrylate (TEGDMA). The copolymerizations led to various glass-rubber relaxation properties of the polymer networks, as revealed by dynamic-mechanical analysis (DMA)...
2017: Acta of Bioengineering and Biomechanics
Maria Szymonowicz, Magdalena Kucharska, Maria Wiśniewska-Wrona, Maciej Dobrzyński, Kamila Kołodziejczyk, Zbigniew Rybak
PURPOSE: For many years research has been conducted on the development of resorbable, polymer, haemostatic materials designed to provide first aid and preliminary protection of injuries. The biological properties in vitro of a dressing in powder form called Hemoguard are expected to provide the ability to instantaneously stem bleeding with safe conditions of use. The aim of the study was to evaluate the haemostatic properties of a model of dressing based on micro- and nanofibrids of the chitosan, sodium/calcium alginate and/or carboxymethylcellulose complex...
2017: Acta of Bioengineering and Biomechanics
Krzysztof Wierzcholski, Andrzej Miszczak
PURPOSE: The topic of the present paper concerns the human joint cartilage therapy performed by the magnetic induction field. There is proved the thesis that the applied magnetic field for concrete cartilage illness should depend on the proper relative and concrete values of applied magnetic induction, intensity as well the time of treatment duration. Additionally, very important are frequencies and amplitudes of magnetic field as well as magnetic permeability of the synovial fluid. MATERIAL AND METHODS: The research methods used in this paper include: magnetic induction field produced by a new Polish and German magneto electronic devices for the therapy of human joint cartilage diseases, stationary and movable magnetic applicators, magnetic bandage, ferrofluid injections, author's experience gained in Germany research institutes and practical results after measurements and information from patients...
2017: Acta of Bioengineering and Biomechanics
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