Wyniki wyszukiwania - Biblioteka Nauki

1

BIomechanical aspects of artificial joint implantation in a lower limb

100%

Będziński R. , Bernakiewicz M. , Ścigała K.

Journal of Theoretical and Applied Mechanics

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1999

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tom nr 3

455-479

EN

One of the most important trends in engineering biomechanics is experimental and numerical analysis of the stress and strain state existing in organs subject to a heavy load; e.g., the knee and hip joints. Clinical tests experimental and numerical studies on design of implants replacing damaged organs are also of crucial importance in development of biomechanics. The research is focused on determination of loads, experimental techniques as well as on simplifications assumed in measurements and applied models. The conducted investigations were concerned with estimation of mechanical behaviour of hip and knee implants after arthoplasty. The experimental tests on both the real objects and models were performed. Numerical simulation was made by using the finite element method. The tests have proved that from the biomechanical point of view proper selection of endoprothesis is of crucial importance for achieving positive long-term results of alloplasty.

PL

Jednym z najważniejszych kierunków badań w dziedzinie biomechaniki inżynierskiej jest doświadczalna i numeryczna analiza stanu odkształceń i naprężeń w organach ludzkich poddanych znacznym obciążeniom, jak chociażby staw biodrowy i kolanowy. Badania kliniczne, doświadczalne i numeryczne poświęcone konstrukcji elementów zastępujących uszkodzone elementy ciała ludzkiego stanowią jeden z najważniejszych kierunków biomechaniki. Dyskusje na tym tle skoncentrowane są na problemach beterminacji występującego stanu obciążenia, stosowanych technik pomiarowych oraz uproszczeń warunków pomiaru i przyjmowanych modeli. Przeprowadzone badania poświęcone zostały ocenie mechanicznej współpracy sztucznych elementów stawu biodrowego i kolanowego w warunkach modelowych, jak i metodą symulacji numerycznej, metodą elementów skończonych. Badania udowodniły duże znaczenie prawidłowej selekcji endoprotez z punktu widzenia biomechaniki układu na długoterminowe powodzenie alloplastyk.

2

Analytical Description of the Biomechanics of the Hip Joint in the Process of Standing on One Leg with Regard to Human Anthropometric Features

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Zaczyk M. , Jasińska-Choromańska D. , Bagiński K.

Machine Dynamics Research

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2014

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tom Vol. 38, No. 4

79-87

EN

The paper describes the biomechanics of the hip joint in the process of loa ing one limb under static conditions. The paper refers to data related to anthropometric features of men and women qualified to the 50th percentile [Skubiszak L., 2009, Trzaskoma Z., 2003]. Kinematics of the hip joint is analyzed, and an attempt is made to determine an influence of variations of the body weight on the forces that occur in the hip joint of a chosen geometry. This information is very important while selecting implants for patients qualified for surgical intervention of implanting the hip joint.

3

Description of the Kinematics of the Implant-Thigh-Bone System while Statically Loaded with the Human Weight

100%

Zaczyk M. , Jasinska-Choromanska D. , Baginski K.

Machine Dynamics Research

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2012

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tom Vol. 36, No. 2

111-117

EN

The paper presents an analytic way of determining loads that occur in the hip joint, with regard for the kinematics of the joint as well as human anthropometric features. The loads were determined considering the system as static, accepting that they result mainly from the weight of the relevant body members contributing to the loads in the joint. The presented analytical description was compared with results obtained by means of numerical techniques, and it was proved that changes of the man’s weight influence local loads at a chosen fragment of the human motor system. Knowledge on the extent of this influence in particular joints, makes it possible to select in an appropriate way a form of the treatment for particular diseases of the human motor system.

4

Non stationary lubricant flow of synovial fluid in a human hip joint

100%

Wierzcholski K.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2002

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tom nr 18

439-444

EN

This paper shows analytical formulae for velocity components and pressure for synovial fluid unsymmetrical flow in hip joint time dependent variable gap lubricated in unsteady motion.

PL

Niniejsza praca wyprowadza formuły analityczne dla składowych prędkości i dla ciśnienia w niesymetrycznym przepływie cieczy synowialnej w zmiennej, zależnej od czasu szczelinie stawu biodrowego smarowanego ruchem niestacjonarnym.

5

Compupational modelling of the hip joint in reference to clinical requirements

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Vaverka M. , Vrbka M. , Navrat T. , Florian Z.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2003

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tom nr 21

201-206

EN

A lot of disorders of the hip, especially in young patients, can be treated with a suitable osteotomy, which is based on the improvement of mechanical conditions in the hip joint. The surface replacement has also been developed as an alternative to a total hip replacement for young and more active people. Two finite element (FE) models are presented in this paper. The first one offers solutions to the strain-stress analysis of the physiological hip joint. The second one enables us to investigate strain and stress parameters in the hip joint with applied surface replacement.

6

Weryfikacja doświadczalna modeli numerycznych kości miednicy człowieka

100%

John A. , Pilarski W.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2002

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tom nr 18

177-182

PL

W pracy poszukiwano optymalnych sposobów modelowania -ŚWarwików fizjologicznych stawu biodrowego, uwzględniając również skutki Jcorekcji chirurgicznych, czy rekonstrukcji uszkodzonego stawu. Podstawą przeprowadzonej analizy była ocena stanu odkształceń w symulowanych gatunkach, ze szczególnym uwzględnieniem rejonu panewki. Do badań Wykorzystano modele fizyczne i numeryczne. W modelach numerycznych giwjlędniono uproszczone warunki obciążeniowe. Weryfikacji doświadczalnej w!

EN

The way of optimal modeling is found. Results of surgical intervention and reconstruction of damaged join are taken into account, too. Here, experimental testing and numerical analysis are performed. In numerical models, simple boundary conditions are assumed. On the ground of strain estimation, for given boundary conditions, comparison of obtained results is done. Experimental verification is done using Electronic Speckle Pattern Interferometry -ESPI

7

Development of new design of the acetabular component for total hip replacement

100%

Sykora J. , Konvickova S. , Daniel M.

Inżynieria Biomateriałów

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2005

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tom R. 8, nr 47-53

19--20

8

Lamé coefficients for ellipsoidal surfaces in lubrication problem of human hip joint

100%

Czajkowski A. A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2001

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tom z. 17

25-30

EN

Analyse of the human joints, in clinical orthopaedic observations aspect, refers to the various geometry of the co-operating bone surfaces. This fact means using the curvilinear orthogonal co-ordinate systems in order to describe the hydrodynamic lubrication problem of the human joints. The estimation of Lame coefficients in the elliptical co-ordinate system, described in order to form the analytical model showing the working parameters of human hip joint, is presented in the paper.

PL

Analiza pracy stawów człowieka w aspekcie obserwacji klinicznych odnosi się do rozpatrywania różnych geometrii współpracujących powierzchni kostnych. Ten fakt oznacza stosowanie krzywoliniowych ortogonalnych układów współrzędnych w celu opisania problemu hydrodynamicznego smarowania stawów. Praca przestawia wyprowadzenie współczynników Lamego we współrzędnych eliptycznych w celu sformułowania analitycznego modelu opisującego parametry pracy stawu biodrowego człowieka.

9

The influence of three different test positions and thigh asymmetry on measurements of isometric hip flexion strength in men and women

100%

Mańka J. , Bobowik P. , Jaskulski K. , Wiszomirska I. , Kaczmarczyk K.

Acta of Bioengineering and Biomechanics

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2022

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tom Vol. 24, no. 4

49--56

EN

The aim of this study was to compare muscle strength at 90° hip and knee flexion as measured in three different positions and to investigate whether an internal or external deficit in the range of rotation in the hip joint affects flexor muscle strength. Methods: We measured the peak muscle torque of rotation in the hip joint, using isometric torquemeter, and hip ROM in healthy participants N = 40, aged 21.6 ± 1.9, in three different measurement positions. We tested for differences between the positions, and for the potential influence of participant’s sex and ROM asymmetry. Results: The measured peak muscle torque was affected not only by sex and the value of hip flexion affect, but also by the position in which it is measured. Subjects with restricted external rotation of the hip joint (CERD) had significantly higher flexor peak muscle torque compared to subjects with restricted internal rotation (CIRD), in all but the supine position. For CERD, the results were: Supine (SuP) 1.02 ± 0.26; Sitting (StP) 1.32 ± 0.58; Standing (SP) 1.53 ± 0.47; and for CIRD, the results were: Supine (SuP) 1.05 ± 0.17; Sitting (StP) 1.05 ± 0.40; Standing (SP) 1.47 ± 0.53. Conclusions: Overall, measurement position and passive ROM significantly influence the peak muscle torque in isometric conditions. Moreover, an imbalance in thigh rotation movement significantly determines the magnitude of muscle torque of the hip flexion movement. Individuals with increased internal-toexternal rotation achieved significantly higher values for flexor muscle torque force moments. Overall, these findings are of importance for interpreting or comparing any reported values for muscle torque force moments.

10

Structural analysis of articular cartilage of the hip joint using finite element method

88%

Karpiński R. , Jaworski Ł. , Zubrzycki J.

Advances in Science and Technology. Research Journal

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2016

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tom Vol. 10, nr 31

240--246

EN

The paper presents the results of a preliminary study on the structural analysis of the hip joint, taking into account changes in the mechanical properties of the articular cartilage of the joint. Studies have been made due to the need to determine the tension distribution occurring in the cartilage of the human hip. These distribution are the starting point for designing custom made human hip prosthesis. Basic anatomy, biomechanical analysis of the hip joint and articular cartilage are introduced. The mechanical analysis of the hip joint model is conducted. Final results of analysis are presented. Main conclusions of the study are: the capability of absorbing loads by articular cartilage of the hip joint is preliminary determined as decreasing with increasing degenerations of the cartilage and with age of a patient. Without further information on changes of cartilage’s mechanical parameters in time it is hard to determine the nature of relation between mentioned capability and these parameters.

11

Hip joint mobility in relation to measurement position, gender and limb dominance

88%

Bobowik P. Ż. , Mańka J. , Jaskulski K. , Kaczmarczyk K.

Acta of Bioengineering and Biomechanics

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2022

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tom Vol. 24, no. 2

65--73

EN

The purpose of this study was to determine whether three different measurement position yield divergent results in ROM using a goniometer, and how is it affected by anthropometrical factors. Methods: We measured the range of rotation in the hip joint in healthy participants aged 21.6 ± 1.88, seeking to determine how the distribution of internal vs. external rotation (RI) within the total range of mobility (TR) was influenced by the measurement position used, the gender of the participant, and the dominant lower limb. Results: We found that not only gender and limb dominance, but also the body position in which hip joint’s range of motion is measured significantly affects the values of TR and RI. We found that TR achieves the highest values in the prone position – PrP (males: 95.35 ± 12.44 and 93.15 ± 12.49; females: 103.75 ± 14.87 and 106.25 ± 15.56) and the lowest values in supine position – SuP (male: 62.65 ± 8.51 and 57.85 ± 9.60; female: 59.5 ± 12.27 and 55.85 ± 8.54). The analysis shows that CERD occurs <0.42 RI in females (PrP) and <0.88 RI in men (PrP and sitting position – StP), and CIRD >1.72 RI in women (StP), and >2.08 RI in men (PrP). Conclusions: Due to the similarities between asymmetry of internal/external rotation in the hip joint and asymmetry in the rotation of the shoulder found in Glenohumeral Internal Rotation Deficit (GIRD), we propose the concepts of Coxal Internal Rotation Deficit (CIRD) and Coxal External Rotation Deficit (CERD) as tools to indicate the possibility for injury to the hip joint, and propose threshold rotation index values serving as indicators of these deficits.

12

Association Analysis of GDF5 and Contributing Factors in Developmental Dysplasia of the Hip in Infants

88%

Harsanyi S. , Zamborsky R. , Krajciova L. , Bohmer D. , Kokavec M. , Danisovic L.

Ortopedia Traumatologia Rehabilitacja

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2021

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tom 23(5)

335-339

EN

Background. Developmental dysplasia of the hip (DDH) is a developmental disorder which is reported to be associated with hip instability. When untreated, it can lead to irreversible joint damage. DDH is known to be a multifactorial disease involving genetic, mechanical and environmental factors. The greatest causative potential is attributed to the genetic component. Growth Differentiation Factor 5 (GDF5) is among the most studied genes associated with processes of regeneration and maintenance of joints. The aim of this work was to analyse the association of SNP rs143383 in the GDF5 gene and the occurrence of DDH, along with association with various contributing factors in the Caucasian population. Material and methods. A total of 118 samples were analysed for the presence of the mutation. DNA was isolated from all individuals from peripheral blood. SNP rs143383 in the GDF5 gene was genotyped using the TaqMan assay. A standard chi-square test was used to compare allele and genotype distributions in patients and healthy controls. Results. The association analysis of genotypes of DDH and rs143383 revealed a significant association. Also, the association of GDF5 and selected contributing factors was statistically significant in female gender (p=0.002), family history (p<0.001), count of pregnancy (p=0.009), laterality of hip involvement and initial US examination. Conclusions. 1. The results indicate an important effect of rs143383 polymorphism in the GDF5 gene on DDH development. 2. However, our results also suggest that rs143383 is not the only contributing factor in the genetic component of DDH.

13

Assessment of the effects of Proprioceptive Neuromuscular Facilitation therapy on the improvement of motor function in a patient after total hip replacement – a case study

88%

Agnieszka Guzik A. , Anna Szpitman ( , Mariusz Drużbicki M. , Justyna Wyszyńska J. , Andżelina Wolan-Nieroda A.

European Journal of Clinical and Experimental Medicine

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2017

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nr 3

287–294

EN

Hip osteoarthritis is a serious clinical and social problem. The number of patients who suffer from degenerative changes in the hip joints and require endoprosthesis-plasty is constantly increasing. This paper presents physiotherapeutic activities based on Proprioceptive Neuromuscular Facilitation (PNF) which optimize a patient’s mobilization using the reserves in their body fully to make improvements in movement and to regain lost functions for achieving beneficial therapeutic effects. The aim of the study was to evaluate the influence of PNF therapy on changes in muscle strength, mobility, and gait pattern in patients after Total Hip Arthroplasty. The case described here regards a 63-year-old woman diagnosed with left hip osteoarthritis who had Total Hip Arthroplasty. The patient was examined twice before and after PNF therapy. The range of mobility of hip joints, level of pain, muscular strength and gait were assessed. Applied PNF therapy, including dynamic (eccentric, concentric) and static muscle training, post-isometric relaxation, stabilization and control in the stance phase, resulted in improved hip joint mobility, muscle strength, gait pattern and pain reduction in the patient. The case study demonstrates that a short (two-week) but intensive (over two hours per day) PNF therapy positively influenced selected motor functions after Total Hip Arthroplasty.

14

Application of statistical analysis and functional assessment tests in patients after trochanteric fractures treated surgically in an individual rehabilitation programme

88%

Skowronek R. , Zawora J. , Kwiatkowski K. , Skalski K.

Acta Mechanica et Automatica

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2021

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tom Vol. 15, no. 3

132--142

EN

Physiotherapeutic procedures after surgical treatment of trochanteric fractures of femurs are a very important element of a post-operative management because they have a significant influence on the final result of physiotherapy. This is due to the nature of the frac-ture and the frequency of its occurrence. The aim of the work is, in particular, to determine the relationship between functional assessment scales in patients after trochanteric fractures treated surgically using extended statistical analysis including regression equations. Statistical analysis included a group of patients, which participated in a specialized programme of a post-operative procedure, called the ‘Individual’ Group. The matrix of research results, calculations of basic statistical measures, such as position, variability, interdependence, asymmetry and concentration were presented for this group. Regression equations representing the relationships between the considered variables, in particular concerning the applied scales and post-operative tests, were presented. Their purpose, mathematical interpretation, results of calculations and statistical tests were discussed. Attention was paid to the high correlation between the Parker and Mobility tests. The extended statistical analysis makes it possible to create an own system for assessing the treatment results of patients after trochanter-ic fractures are treated surgically.

15

The determination of abrasion resistance of selected biomaterials for the friction pairs in the hip joint endoprosthesis

88%

Zasińska K. , Seramak T. , Łubiński J.

Advances in Materials Science

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2014

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tom Vol. 14, nr 3(41)

53--63

EN

The key requirement for the modern endoprosthesis is high durability of the friction components, which results in long and trouble-free operation in the human body. The durability of currently used endoprosthesis is often limited by tribological wear processes of friction components (e.g. between the head and the acetabular component in a hip joint endoprosthesis) [8, 19, 23, 24]. In order to compare the tribological wear, tribological tests were carried out by means of tribometer on friction pairs of the following composition: implantation steel 316 LVM/PE-UHMW and titanium alloy Ti13Nb13Zr/PE-UHMW. Determining of the friction coefficient, measured profiles of surface roughness and microscopic observation allowed to evaluate the abrasive wear of the tested biomaterials.

16

Strenghth analysis of hip joint replacement revision implant

88%

Skowronek P. , Twardoch K. , Skawiński P. , Żołnierz M.

Journal of Theoretical and Applied Mechanics

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2019

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tom Vol. 57 nr 1

235--248

EN

The subject of the article is the evaluation of the strength of revision implants made of titanium or tantalum alloy, used during bone reconstruction of a hip joint while potentially using additional stabilizing screws, necessary due to significant bone loss. The article provides a preliminary strength analysis of implants, indispensable for further evaluation of strength limitations due to the risk of implant damage depending on the structure and number of additional screw holes. In the human locomotor system, the hip joint is the joint with the most load, hence the main problem is to establish an adequate load model which ought to be assumed for the needs of implant strength analysis. It is found necessary to perform a short, analytical review of the existing hip joint load models from the point of view of choosing the proper one, considering evaluation of implant strength by means of numerical studies using FEM. Differences in the implant load distribution depending on the used material are shown.

17

In vitro history to evaluate the effects of daily activities on cemented hip implants

75%

Cristofolini L. , Savigni P. , Teutonico A. S. , Viceconti M.

Acta of Bioengineering and Biomechanics

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2003

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tom Vol. 5, nr 2

77-87

EN

The loads acting on the hip joint during daily activities contribute to the failure of the fixation of cemented hip stems. An in vitro analysis of newly designed prostheses is necessary prior to in vivo clinical trials. In vitro pre-clinical testing procedures up to now have consisted in simulating only one or two conditions. The goal of this work was to define a procedure to assess the long-term effect of the most stressing activities on the integrity of the cement mantle. Thus, a cyclic load of constant amplitude is not acceptable. All activities inducing high loads need to be included, so as to replicate the most critical scenario from a fatigue point of view. The following activities were included in the load history: stair climbing and descending, car entry and exit, bathtub entry and exit, and stumbling. Load values and direction were assigned to each activity, based on the literature. A typical week was defined for a patient, based on statistics from the literature. An in vitro simulation running for 2 weeks was able to replicate the load peaks occurring in 24 years of patient activity. Stem-cement elastic micromotion and permanent migration arc continuously recorded at 5 locations. The cement mantle is inspected by means of dye penetrants after test completion to quantify the fatigue damage in the cement mantle. The load history was successfully applied to two different designs and is therefore ready for future applications to evaluate the long-term performance of the new prostheses and the effects of daily activities on implant outcomes.

18

The effect of corrective exercises on the range of motion of the hip joints and the result obtained in the Deep Squat of FMS Test

75%

Oleksiak J. , Sobianek A. , Janiszewski M.

Central European Journal of Sport Sciences and Medicine

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2019

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tom 26

|

nr 2

19

Historia endoprotez stawu biodrowego do roku 1962

75%

Ciećkiewicz A. , Cwanek J.

Problemy Nauk Stosowanych

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2014

|

tom T. 2

131--142

PL

Wstęp i cel: Niezadowalające wyniki leczenia zmian zwyrodnieniowych stawu biodrowego metodami nieoperacyjnymi (zachowawczymi) w XIX wieku, zmusiły lekarzy do poszukiwania chirurgicznych metod leczenia choroby. Przyczyniło się to do skonstruowania endoprotez stawu biodrowego. Materiał i metody: W oparciu o dane z piśmiennictwa, w pracy przedstawiono rozwój endoprotezoplastyki stawu biodrowego od końca XIX wieku do 1962 roku, kiedy Charnley wszczepił pierwszy „niskotarciowy” sztuczny staw biodrowy. Mimo wprowadzenia licznych zmian konstrukcyjnych po 1962 r., zasady budowy endoprotez biodra nie zmieniły się. Wyniki: Wszczepienie w 1962 r. pierwszej „niskotarciowej” endoprotezy, pozwoliło na powszechne stosowanie endoprotezoplastyki biodra w procesie leczenia zmian zwyrodnieniowych stawu biodrowego. Wniosek: Pomimo wielu wad endoprotezoplastyki biodra, jest to najskuteczniejsza metoda leczenia zaawansowanych artroz biodra.

EN

Introduction and aim: Unsatisfactory results of treatment of degenerative changes in the hip joint methods unresectable (conservative) in the nineteenth century, doctors forced to seek surgical treatments for the disease. This contributed to the construction of hip replacements. Material and methods: Based on data from the literature, the paper presents the development of hip replacement since the late nineteenth century until 1962, when implanted Charnley first “lowfrictional” artificial hip joint. Despite the introduction of numerous design changes to the 1962 rules for the construction of replacement hip has not changed. Results: Implantation in 1962, the first “low-friction” prosthesis, led to widespread use of hip arthroplasty in the treatment of degenerative changes in the hip joint. Conclusion: Despite the many flaws hip arthroplasty is the most effective method of treatment of advanced arthritis hip.

20

Ocena niepewności pomiarów parametrów stawów biodrowych u dzieci

75%

Gilewska G.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2017

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tom Nr 54

67--69

PL

W artykule przedstawiono aspekty oceny niepewności pomiarów parametrów anatomicznych na obrazach radiologicznych. Oceny dokonano na podstawie pomiarów realizowanych z wykorzystaniem obrazów radiologicznych wykonanych w standaryzowanych projekcjach. Pomiary przeprowadzono za pomocą programu opracowanego do wyznaczania wybranych parametrów i wskaźników radiologicznych umożliwiających ocenę budowy stawu biodrowego u dzieci. Wykonano kilka serii pomiarowych dla pacjentów w różnym wieku. Dokonano oceny niepewności wyników pomiarów parametrów anatomicznych, takich jak kąt Wiberga (WB), kąt nachylenia panewki Sharpa (NP), kąt centrowania szyjki kości udowej (CS).

EN

The paper presents aspects of the evaluation of measurement uncertainty of anatomical parameters on radiological images. Measurements carried out on the basis of radiological images taken in standardized projections were evaluated. Measurements were made in a specially designed measurement program for selected radiographic parameters and indicators to assess the hip joint structure in children. Several measurement series have been made for patients of different ages. Factors influencing the uncertainty of anatomical parameters such as patient age, bone marrow pathology, and operator skills have been evaluated.