Rita M Kiss

Budapest University of Technology and Economics · Department of Mechatronics, Optics and Information Engineering

Recent theory describes the non-contact anterior cruciate ligament injury as a bi-phasic non-contact injury mechanism. Accordingly, the primary proprioceptive nerve ending microinjury could evolve as a result of unaccustomed or strenuous eccentric contractions when the sustainment of these fatiguing contractions induces an acute stress response. Th...

Finite element (FE) analyses contribute to a better understanding of the human lumbar spine’s biomechanics and serve as an effective predictive tool. This study aims to present the development of two L1–L5 FE models using literature-based (LBM) and patient-specific (PSM) bone material assignment approaches. The geometry of the lumbar spine was deve...

We examined the effects of side-dominance on the laterality of standing stability using ground reaction force, motion capture (MoCap), and EMG data in healthy young adults. We recruited participants with strong right (n = 15) and left (n = 9) hand and leg dominance (side-dominance). They stood on one or two legs on a pair of synchronized force plat...

The objective of the present pilot study was to determine the force required to break (a) intact canine tibiae, (b) tibiae following the osteotomy of the tibial tuberosity and (c) tibiae following Tibial Tuberosity Advancement- (TTA-) rapid surgery. Six pairs of tibiae of dogs between 15 and 35 kg body weight were used in a cadaver study. Three gro...

The filtering process for marker displacement data in gait analysis has been unchanged for almost 50 years, despite technological advances in measurement equipment. Most researchers use a second-order zero-lag Butterworth low-pass filter with a cutoff frequency of 6 Hz, which was established based on TV camera recordings digitised at 96 × 96 pixels...

Allografts have become increasingly preferred for anterior cruciate ligament replacement purposes. The risk of infections necessitates thorough sterilization procedures, and the allografts usually need to be stored prior to surgery. Classical mechanical tests have been performed with various types of tendons, however, tibialis anterior and peroneus...

Basketball is one of the most popular team sports in the world. A wide variety of athletic skills can be valuable indicators of a talented player. Testing these skills help trainers and scouts to make the best decisions during both youth and adult player selection of different competitive levels and field positions. However, scientific data regardi...

Background It is important to know the biomechanical properties of an allograft. This is because when looking to do a transplant of a tendon, the tendon must have very similar biomechanical properties to the original tendon. To use tendon allografts, it is critical to properly sterilize the tendon before implantation. In past decades, several steri...

Background It is important to know the biomechanical properties of an allograft. This is because when looking to do a transplant of a tendon, the tendon must have very similar biomechanical properties to the original tendon. To use tendon allografts, it is critical to properly sterilize the tendon before implantation. In past decades, several steri...

In the case of the transplant surgery of ligaments, it is common practice to use tissues from other parts of the body with similar properties. Although they have similarities, there are some distinct properties, some of which may have serious effects on the success of the operation. These properties can be measured and compared to each other so tha...

This study aimed to evaluate the changes in the endurance properties of four types of tendons caused by freezing and gamma irradiation. Four types of grafts were harvested: quadriceps, semitendinosus + gracilis, tibialis anterior, and peroneus longus. These were put into three groups: Group A was the control group, tested without freezing or irradi...

Compression garments have been used in medicine for many years. Because of the external compression the linear velocity of the blood flow increases inducing an improved blood circulation. According to recent researches in the field of compression garments’ efficiency in sport exercises, there are no any conventional consequences. Moreover, during t...

Human hand injuries account for a significant number of accidents of young adults (mostly sports injuries) and elderly people. The most vulnerable part of the hand is the wrist, a construct consisting of numerous bones and ligaments. The hand is a complex structure, the mechanical behavior is hard to describe, and also it is sometimes hard to corre...

A mindennapi és a sportéletben egyaránt fontos a törzsizmok és más testtartásért felelős izmok megerősítése és egyensúlyának biztosítása. A testtartás izmainak tesztelésére jól alkalmazható a plank-teszt, mely a fekvőtámaszhoz hasonló, csak hajlított alkartámaszban kezdődik és ennek a helyzetnek az egy percig történő megtartása. Előnye, hogy könnye...

Purpose: No any research in literature was found to investigate the effect of pes planus on standing balance in school-aged children. Any kind of change in the arches (height, flexibility) may increase the possibility of a change in standing balance. The aim of present study is to determine the influence of pes planus on the standing balance of sch...

Spiking neural networks (SNNs) receive trains of spiking events as inputs. In order to design efficient SNN systems, real-valued signals must be optimally encoded into spike trains so that the task-relevant information is retained. This paper provides a systematic quantitative and qualitative analysis and guidelines for optimal temporal encoding. I...

A typical optical based gait analysis laboratory uses expensive stereophotogrammetric motion capture systems. The study aims to propose and validate an affordable gait analysis method using augmented reality (AR) markers with a single action camera. Image processing software calculates the position and orientation of the AR markers. Anatomical land...

Bland-Altman plots of gait parameters. (PDF)

Anatomical point calibration animation. (GIF)

Gait analysis with AR markers animation. (GIF)

Data manipulation figures. (PDF)

Bland-Altman plots for virtual anatomical points. (PDF)

Gait parameters comparison data. (XLSX)

C# source code snippets for anatomical calibration and anatomical point tracking using homogeneous coordinate transformation. (PDF)

Assessment of balancing abilities require quantification of balancing motion response, typically using a kinematic or dynamic model of the human body. In this proof of concept work, we demonstrate a 4 degrees-of-freedom, two-link double pendulum model of the human body created according to the Denavit-Hartenberg convention and its utility in a sudd...

In the research, a static hiking bench, built after our custom design, with load sensors was used as a boat simulator. The feasibility of the developed instrument and measurement method was tested on a professional Finn dinghy sailor. The body posture in 3D and the exerted forces were recorded during different simulated wind strengths (light, moder...

A key step in gait analysis is the denotation of anatomical landmarks, often called calibration. Before, no standardised framework existed for determining and comparing the accuracy of this procedure. The goal of the present study was to develop suitable standards and utilize these to examine how a set of changes to a calibration protocol affects a...

Dynamic balancing abilities can be assessed with perturbation tests. The present study examined the effectiveness of balancing (damping ratio) and the recovery action (directional ratio) in bipedal and dominant single-leg stance in the young population. Twenty-four healthy young adult participants completed unidirectional lateral perturbations succ...

The oldest and most precise way to determine the curvatures of the spine is two directional X-ray measurement from the sagittal and coronal planes. By using X-ray, patients are exposed to radiation, which limits the repeatability of the measurements even in serious deformities, thus X-ray is not applicable for frequent monitoring. Therefore new alt...

Introduction: Bad posture is a well-known problem in children and adolescents, and it has a negative effect in adulthood. It can be hypothesized that due to bad posture, changes in the body’s position cause changes in standing balance. Objective: The objective of the study is to determine the influence of bad posture on the standing balance of scho...

Background and purpose The most common and gold standard method to diagnose and follow-up on scoliosis treatment is to capture biplanar X-ray images and then use these to determine the sagittal frontal spinal curvature angles by the Cobb method. Reducing exposure to radiation is an important aspect for consideration, especially regarding children....

With the spreading of motion analysis decisions to invest into a new system demand scientific reference applications. The aim of the present systematic review is to reveal the biomechanical scientific applications of OptiTrack motion capture systems and to overview documented usage conditions and purposes. Six major scientific literature databases...

Recent studies have suggested reduced independent and sensitive parameter sets for stabilometry measurements based on correlation and variance analyses. However, the reliability of these recommended parameter sets has not been studied in the literature or not in every stance type used in stabilometry assessments, for example, single leg stances. Th...

Individual measurement data. (XLSX)

Motion capture systems are widely used to measure human kinematics. Nevertheless, users must consider system errors when evaluating their results. Most validation techniques for these systems are based on relative distance and displacement measurements. In contrast, our study aimed to analyse the absolute volume accuracy of optical motion capture s...

The laparoscopic minimally invasive surgical technique is widely employed on a global scale. However, the efficient and ethical teaching of this technique requires equipment for surgical simulation. These educational devices are present on the market in the form of box trainers and virtual reality simulators, or some combination of those. In this a...

Background Static balancing assessment is often complemented with dynamic balancing tasks. Numerous dynamic balancing assessment methods have been developed in recent decades with their corresponding balancing devices and tasks. Objective The aim of this systematic literature review is to identify and categorize existing objective methods of stand...

Tables of all extracted data from articles used in final synthesis. Records are categorized corresponding to the balance device categories presented in the Results section of the paper. (DOCX)

Aims The aim of this study was to examine the effects of gender on the relationship between Functional Movement Screen (FMS) and treadmill-based gait parameters. Methods Twenty elite junior athletes (10 women and 10 men) performed the FMS tests and gait analysis at a fixed speed. Between-gender differences were calculated for the relationship betw...

The assessment of balancing abilities is an integral part of orthopaedic and physiotherapeutic evaluation. A widely used therapeutic and diagnostic method is to apply a sudden unidirectional perturbation. The goal of this study is to evaluate the effect of the medio-lateral (ML) perturbation directions, i.e. lateral and contra-lateral, on balancing...

Bevezetés: Az egyensúlyozó-képesség vizsgálata szerves része az ortopédiai állapotfelmérésnek, elváltozások progressziójának követésében és a beavatkozások utáni felépülés nyomon követésében. A leginkább elterjedt állásstabilitás-vizsgálat (poszturográfia) mellett igény van a nehezebben kivitelezhető mozdulatokra való képesség felmérésére, idős sze...

The present study aims to determine the effect of professional sailing on the balancing ability compared to a control group using ultrasound-based provocation tests on a moving platform. The balancing capacity after sudden unidirectional perturbation is characterized by following parameters: the damping time (T), the Lehr’s damping ratio (D), the o...

Gait analysis gets more accessible, accurate, and simple to use as technology advances. The goal of this paper is to explore the accuracy of an advanced optical motion analysis system, where marker clusters mounted on rigid shapes are used to track the movement of body segments. It aims to examine the magnitude and nature of variation of the angula...

Knee osteoarthritis (OA) is one of the most widespread orthopedic disease that affects the elderly. The present study aims to evaluate the biomechanical effects of bilateral osteoarthritis on elderly patients compared to a control group using stabilometry parameters. The used parameters were center of pressure (CoP) 95% confidence ellipse area, CoP...

The use of a free oscillating platform for balance training is widespread. However, there is a lack of variables used when analyzing these measurement results. The aim of this study was to introduce and evaluate a new variable. The directional ratio is the ratio of total length of oscillation travelled in the direction parallel and perpendicular to...

Knee osteoarthritis is one of the most widespread orthopedic diseases among elderly people. Biomechanical effects of this disorder are widely studied. In case of very intense knee osteoarthritis, typical measurements such as gait analysis are no longer possible. On the other hand stance tests can be performed even in these very severe cases. In our...

3D printing, as a rapid prototyping method is become more common nowadays world widely, including medicine too. The purpose of this article is to reveal the potential of using 3D printing in medicine, especially with a specific example of making a human thorax model from the very beginning of imaging diagnose to the physical model. There will be sh...

Introduction: The goals of our study were to evaluate the biomechanical differences between five tendons and the changes in biomechanical properties caused by irradiation. Methods: Achilles, quadriceps, semitendinosus + gracilis (STG), tibialis anterior (TA) and the peroneus longus (PL) were harvested from 30 donors. Group A contained 50 tendons...

During postural stability evaluation frequency analyses are applied on the motion of the foot center of pressure (CoP). In this study we compared the most widely used frequency type CoP parameters (median frequency, mean power frequency, bandwidth) including some newly defined parameters (frequency range power ratios, spectral power ratio between t...

Stabilometry is the study of human postural stability. It can be used in clinical diagnosis and sport sciences as well. Expensive force distribution plates and force plates are used to these measurements. This paper validates the Nintendo Wii Balance Board for stabilometry measurements as a cheap alternative to the expensive force distribution plat...

The goal of the study was to find a proper technique to fix tendon grafts into an INSTRON loading machine. From 8 human cadavers, 40 grafts were collected. We removed the bone-patella tendon-bone grafts, the semitendinosus and gracilis tendons, the quadriceps tendon-bone grafts, the Achilles tendons, and the peroneus longus tendons from each lower...

During the stabilometry foot center of pressure (COP) was measured on force plates or force distribution plates. From the sampled data several widely used parameters (95% confidence ellipse axes, area and angle, standard deviations of COP, path length and COP ranges) and newly defined parameters 95% confidence ellipse axis ratio, anteroposterior-me...

The aim of the research was to design powder type self-compacting concrete containing high amount of limestone quarry waste as aggregate and fines. The light colour aggregate mixed with white cement resulted in esthetical surfaces of exposed concrete for architectural purposes. Large amount waste originated from the limestone mining process require...

The oldest and most accurate way of determining the shape of the spine is to make X-rays from two different angles, which can be performed once a year even in serious diseases, due to its high radiation exposure. However, in case of a conservative treatment of spinal disorders, continuous monitoring is necessary, thus different in-vivo methods are...

Introduction and objective: Total knee arthroplasty (TKA) affects 1-3% of the entire population. The effectiveness of surgery and rehabilitation are of great significance. The goal of this study was to determine how different surgical methods (i.e., conventional and minimally invasive) influence balancing ability in response to sudden unidirectiona...

In children's posture examinations the question often arises whether an X-ray examination is necessary or appropriate. On screening and in other cases when X-ray is contraindicated, alternative-non-invasive-examinations are available. To measure the shapes of the children's spines beside the Spinal Mouse also the Zebris ultrasound-based spine measu...

The gait parameters, the variability of gait, the balancing ability are influenced by unilateral knee osteoarthritis. The aim of this study is to analyze balancing ability after sudden perturbation characterized Lehr's damping ratio measured by provocation test stance on both and on single limb at patient with bilateral knee osteoarthritis. 20 cont...

The purpose of this study was to work out an objective and sensitive method for the early postoperative period following total knee arthroplasty (TKA) in which analysis of the gait parameters is possible and also to investigate the influence of different surgical approaches for TKA on the gait during stepping in the first three months of the postop...

The Silences of the Archives, the Reknown of the Story. The Martin Guerre affair has been told many times since Jean de Coras and Guillaume Lesueur published their stories in 1561. It is in many ways a perfect intrigue with uncanny resemblance, persuasive deception and a surprizing end when the two Martin stood face to face, memory to memory, befor...

INTRODUCTION, OBJECTIVE: Gait analysis has provided important information about the variability of gait for patients prior to and after total hip arthroplasty (THA). The objective of this research was to clarify how the method of exposure in total hip arthroplasty affects the variability of gait. MATERIALS AND METHOD: Gait analysis was performed at...

In the development of new strategies for different spine fixation methods, new methods must be tested biomechanically under in vitro conditions before clinical trials can be performed. The effect of different conservation mode on the mechanical properties of vertebrae is an important question. The aim of our research was to determine the effects of...

Total knee arthroplasty significantly influenced gait parameters and the variability of gait. The aim of this research was to analyze the effect of total knee arthroplasty (TKA) on balancing ability after sudden perturbation in the early postoperative period. Balancing ability after sudden perturbation was modeled by a provocation test and characte...

Total hip arthroplasty affects 3–5% of the elderly population. Therefore, the effectiveness of surgery and the ensuing rehabilitation is of great significance. This study investigated balancing ability in response to sudden unidirectional perturbation changes during the first 6 months of the postoperative period with respect to different methods of...

Total hip arthroplasty is a surgical procedure that usually results in almost complete pain relief and early improvement in functional capacity. Previous analyses of the gait of total hip arthroplasty patients have ignored the effect of total hip arthroplasty on the motion of other joints in the operated and non-operated limbs and of the pelvis. We...

This study aimed to assess equilibrium ability after sudden perturbation in patients with moderate and severe unilateral knee osteoarthritis (OA), with regard to age, gender, and lateral dominance. Our clinical trial included 45 female and 45 male healthy elderly subjects, 24 female and 24 male patients with moderate OA (mOA), and 24 female and 24...

Gait analysis has provided important information about the variability of gait for patients prior to and after total knee arthroplasty (TKA). The objective of this research was to clarify how the different surgical techniques influence gait variability. Gait analysis was performed at 0.8, 1.0, and 1.2 m/s in three groups of patients (operated on us...

The most attention-deserving spine deformity in childhood is scoliosis which means that it has to be diagnosed properly. The therapy varies from patient to patient according to the symptoms of the disease and it has to be revised from time to time. A full observational treatment consists of not only physical examination but also of applying imaging...

The gender and age of healthy subjects has a considerable impact on gait parameters. The aim of this research is to establish how gait variability is affected by these two parameters. Gait variability was calculated from gait parameters during treadmill walking consisting of more than 400 gait cycles at 40 healthy elderly and 40 healthy young subje...

Medial meniscus tears and medial partial meniscectomies can damage or remove mechanoreceptors in the meniscus; this inevitably affects knee joint proprioception. Few studies have addressed this subject and none has examined balance in response to sudden perturbation, which requires complex coordination. This study investigated changes in balance in...

An unstable oscillatory platform can be used as a simple measuring instrument for modelling balancing capacity. We sought to determine the effects of (1) lateral dominance, (2) the body mass index, (3) age, (4) gender on the Lehr’s damping ratio for characterizing the balancing capacity after sudden perturbation of 137 healthy elderly participants....

The goal of this research was to analyze the effect of total hip arthroplasty (THA) on balancing ability among 20 healthy elderly people and 18 subjects operated on by a conventional direct-lateral approach during the early postoperative period. Balancing ability after sudden perturbation was modeled by the provocation test during double leg and si...