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Tensomiograficzna charakterystyka wybranych mięśni stabilizujących miednicę w korelacji z kątem pochylenia miednicy u młodych zdrowych kobiet

Fryc Dobrochna, Bibrowicz Karol

Aktualne Problemy Biomechaniki

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2020

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z. 20

37--43

PL

Przodopochylenie miednicy jest powszechnie korelowane w posturologii z osłabieniem i przykurczem wybranych grup mięśniowych. Badanie miało na celu wstępną analizę morfo-funkcjonalną kluczowych mięśni w korelacji z kątem pochylenia miednicy. 30 zdrowych kobiet przebadano przy pomocy tensomiografii oraz duometru. Badanie wykazało istotną korelację kąta pochylenia miednicy z parametrami TMG jedynie w przypadku wybranych parametrów czasowych mięśnia prostownika grzbietu lewego. Zagadnienie wymaga dalszych badań, zwłaszcza z udziałem osób ze zdiagnozowanymi wadami postawy.

EN

Anterior pelvic tilt in posturology is usually correlated with weakened and contracted groups of muscles. Aim of this study was to if those schemas have their overtone in morpho-physiology of muscles. 30 young and healthy women were tested using tensiomyography and duometer. Study revealed statistically significant correlation of pelvic tilt angle with TMG parameters only in some of the time variables of left erector spinae. Further studies are needed, especially those, that will include people with diagnosed posture defects.

2

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

Karpiński R., Jaworski Ł., Zubrzycki J.

Advances in Science and Technology. Research Journal

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2016

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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.

3

The relationship between trunk and pelvis kinematics during pregnancy trimesters

Eldeeb A. M., Hamada H. A., Abdel-Aziem A. A., Youssef A. M.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 4

79--85

EN

Purpose: Pregnancy is characterized by many musculoskeletal changes that affect daily living activities and walking. The purpose of this study was to examine the effect of pregnancy on pelvic and trunk kinematics, and their relationship during the three pregnancy trimesters. Methods: Three-dimensional pelvis and trunk motions were measured using Qualisys Gait Analysis System in the first, second and third trimesters of pregnancy. The maximum anterior pelvic tilt and maximum trunk flexion during stance phase, pelvic tilt, obliquity and rotation, as well as trunk flexion-extension, lateral bending and rotation were measured. Results: Repeated-measures analysis of variance showed a significant increase in the maximum anterior pelvic tilt during stance phase (p=0.005), and a significant decrease in the pelvic obliquity (p=0.011), maximum trunk flexion during stance phase (p=0.0006), trunk lateral bending (p=0.005) and trunk rotation (p=0.004). A significant negative correlation was found between maximum anterior pelvic tilt and maximum trunk flexion in the first (r=-0.72, p=0.008), second (r=-0.61, p=0.03), and third (r=-0.61,p=0.03) trimesters of pregnancy. Also, there was a significant positive correlation found between pelvic obliquity and trunk lateral bending in the first (r=0.76, p=0.04), second (r=0.59, p=0.04), and third (r=0.59, p=0.04) trimesters of pregnancy. Conclusions: The pregnant women walk with an increased maximum anterior pelvic tilt, a decreased maximum trunk flexion, a decreased pelvic obliquity, as well as a decreased trunk lateral bending and rotation. Pregnancy does not affect the relationship between pelvis and trunk motions.

4

Biometrological method of pelvis measurement and anatomical positioning of endoprosthesis of hip joint

Ryniewicz A., Ryniewicz A. M., Madej T., Sładek J., Gąska A.

Metrology and Measurement Systems

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2013

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Vol. 20, nr 1

17-26

EN

This elaboration presents the method of virtual positioning of the construction of an endoprosthesis of hip joint in a patient's pelvis and femoral bone, reconstructed on the basis of imaging obtained from computer tomography. It is based on the matching of an implant to individual anatomical-biomechanical conditions. The method is established on the following procedures: diagnostic, spatial modeling, virtual measuring and targeted biometrological application for the model of bone structures. The final effect of the completed procedures is selection and optimal positioning of the endoprosthesis of hip joint before a planned medical intervention. The determined geometrical parameters of bone structures and settled positioning of the endoprosthesis can create data for the system of computer navigation.

5

Human pelvis loading rig for static and dynamic stress analysis

Zanetti E.M., Bignardi C., Audenino A.L.

Acta of Bioengineering and Biomechanics

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2012

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Vol. 14, no. 2

61-66

EN

This work is aimed at designing and constructing a loading rig for the synthetic hemi-pelvis; this system has been conceived with the goal of applying differently oriented articular forces in order to experimentally test the stress distribution and the stability of surgical reconstructions like, for example, hip arthroplasty or pelvic fixation. This device can be interfaced with a usual loading machine; it preserves the anatomy of the hemi-pelvis; it is simply constrained and it allows the simulation of all physiologic activities. Moreover, the visual accessibility of the peri-acetabular area has been guaranteed and this is imperative in order to be able to perform full-field analyses like a thermoelastic or photoelastic stress analysis. First experimental trials have shown a good repeatability of loading–unloading cycles (<1.2%), a low hysteresis (<2.4%) and a good dynamic behaviour (up to 10 Hz loading frequencies).

6

Geometric model of the human body for static and kinematic analysis

Erdmann W.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 26

99-104

EN

The paper presents geometric model of the human body. With the help of markers and angles body might be oriented both in static and kinetic conditions according to acquired reference system. Basic model consists of 17 parts - five for centroid and three for every extremity. Developed model consists of 30 parts. Pelvis was established as a main part of the body orientation. Special attention was paid to description of shoulder's position.

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Pelvis stress and strain distribution under gravitational and external load

Mrozowski J., Awrejcewicz J.

Vibrations in Physical Systems

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2006

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Vol. 22

285--290

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Wpływ warunków brzegowych na rozkład naprężeń i przemieszczeń w numerycznym modelu kości miednicy człowieka

John A., Dąbrowska-Tkaczyk A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1999

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z. 10

165-170

PL

Numeryczne modelowanie kości miednicy człowieka pozwala określić stan naprężenia i odkształcenia w tkance kostnej w przypadku prawidłowej budowy jak i w przypadku zmian zwyrodnieniowych. W pracy przedstawiono wpływ warunków brzegowych na wyniki obliczeń numerycznych. Analizowano model powłokowy i bryłowy kości miednicy pod działaniem obciążeń typowych, pochodzących od ciężaru ciała i napięć aktonów mięśniowych. Analizę przeprowadzono metodą elementów skończonych.

EN

Numerical modeling of human pelvic bone makes possibilities to determine the stress and strain distribution in bone tissue when the structure is correct or incorrect. Load cases can be typical or atypical. Some simplifications are performed. In the paper the influence between boundary conditions and numerical results is presented. The shell model and solid model of pelvic bone are analyzed. The finite element method is applied.

9

Analiza obciążenia i rozkładów naprężeń w numerycznym modelu powłokowym kości miednicy człowieka podczas quasi-statycznego pochylenia tułowia do przodu

Dąbrowska-Tkaczyk A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1999

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z. 10

59-64

PL

Przedmiotem badań jest model numeryczny kości miednicy człowieka zbudowany z elementów powłokowych [3], obciążony siłą ciężkości oraz siłami napięcia aktonów mięśniowych, oddziałujących na kość w czasie pochylenia tułowia do przodu [6]. Wyznaczono rozkłady naprężeń redukowanych wg hipotezy Burzyńskiego oraz przentieszczenia. Analizie poddano również wartości wypadkowych sił reakcji w stawie biodrowym w kolejnych położeniach tułowia. Obliczenia wykonano metodą elementów skończonych przy wykorzystaniu programu PRO-MES 4.4

EN

The investigations of human pelvic bone loading were done and reduced stress distribution according to Burzyński hypothesis were determined using of finite elements method, shell numerical model, [3] and program PRO- MES 4,4. Gravitate force of the upper part of the body and muscles forces calculated for model of the pelvic bone loading during quasi-static forward rotation of the trunk [6]. There were determined displacements in the bone and also force reactions in the hip joint.