Virtual Model and Simulation of the Normal and Affected Human Hip Joint

Călin, Daniel Cosmin; Tarniţă, Daniela; Popa, Dragoș Laurențiu; Calafeteanu, Dan

doi:10.4028/www.scientific.net/amm.823.167

Cited by 6 publications

(10 citation statements)

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“…For this purpose, the surfaces of the ribs, vertebrae, the two portions of the femur, and other elements that were not of interest for our study were removed. Surface decimation methods were also used as well as “finishing” operations, which are described in more detail in other papers [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

“…After running the simulation, we obtained results maps [ 31 , 55 , 56 ]. Figure 46 shows the displacement map, Figure 47 the strain map, and Figure 48 the stress maps.…”

Section: Resultsmentioning

confidence: 99%

“…The following simplifying assumptions were used in the analyses of the three orthopaedic systems: Knowing that orthopaedic cement, used in these orthopaedic prostheses, provides stability and fixation of the components, it was not geometrically modelled, and its behaviour was replaced with the use of bonded elements that practically provide cohesion of the elements between themselves [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]; It is known that, during the human gait, the variation of the force occurring in the hip joint varies between values of 0 N and about 2300 N. We have considered that it is sufficient to use an equivalent force that has a linear variation between the values of 800 N (characteristic of the orthostatic position) and 2300 N (maximum value of the force during normal human gait [ 26 , 27 , 28 , 29 , 30 , 31 , 39 , 42 ]); For revision prostheses using a morcellated bone graft, the study was considered to be performed after complete osseointegration of the graft, when it acquires the appearance and properties of the trabecular bone [ 26 , 27 , 28 , 39 ]. …”

Section: Methodsmentioning

confidence: 99%

“…Knowing that orthopaedic cement, used in these orthopaedic prostheses, provides stability and fixation of the components, it was not geometrically modelled, and its behaviour was replaced with the use of bonded elements that practically provide cohesion of the elements between themselves [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ];…”

Section: Methodsmentioning

confidence: 99%

“…It is known that, during the human gait, the variation of the force occurring in the hip joint varies between values of 0 N and about 2300 N. We have considered that it is sufficient to use an equivalent force that has a linear variation between the values of 800 N (characteristic of the orthostatic position) and 2300 N (maximum value of the force during normal human gait [ 26 , 27 , 28 , 29 , 30 , 31 , 39 , 42 ]);…”

Section: Methodsmentioning

confidence: 99%

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An Experimental and Virtual Approach to Hip Revision Prostheses

et al. 2022

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(1) Introduction: The changes in the joint morphology inevitably lead to prosthesis, but the hip pathology is complex. The hip arthroplasty is a therapeutic solution and can be caused, most frequently, by primary and secondary coxarthrosis due to or followed by traumatic conditions. The main aim of this study was to find the method of revision hip prosthesis that preserves as much bone material as possible and has sufficiently good mechanical strength. (2) Materials and Methods: In this study, in a first step, the two revision prostheses were performed on bone components taken from an animal (cow), and then, they were tested on a mechanical testing machine until the prostheses physically failed, and the force causing their failure was determined. (3) Results: These prostheses were then modelled in a virtual environment and tested using the finite element method (FEM) in order to determine their behaviour under loading from normal human gait. Displacement, strain, and stress maps were obtained. (4) Discussion: Discussions on hip revision prostheses, method, and theory analysis are presented at the end of the paper. (5) Conclusions: Important conclusions are drawn based on comparative analyses. The main conclusion shows that the both orthopaedic prostheses provide a very good resistance.

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Section: Resultsmentioning

confidence: 99%

“…After running the simulation, we obtained results maps [ 31 , 55 , 56 ]. Figure 46 shows the displacement map, Figure 47 the strain map, and Figure 48 the stress maps.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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An Experimental and Virtual Approach to Hip Revision Prostheses

et al. 2022

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Novel IMU-Based Adaptive Estimator of the Center of Rotation of Joints for Movement Analysis

Villa

Martín

Domínguez

2021

IEEE Trans. Instrum. Meas.

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The location of the center of rotation (COR) of joints is a key parameter in multiple applications of human motion analysis. The aim of this work was to propose a novel realtime estimator of the center of fixed joints using an inertial measurement unit (IMU). Since the distance to this center commonly varies during the joint motion due to soft tissue artifacts (STA), our approach is aimed at adapting to these small variations when the COR is fixed. Our proposal, called ArVE d , to the best of our knowledge, is the first real-time estimator of the IMU-joint center vector based on one IMU. Previous works are off-line and require a complete measurement batch to be solved and most of them are not tested on the real scenario. The algorithm is based on an Extended Kalman Filter (EKF) that provides an adaptive vector to STA motion variations at each time instant, without requiring a pre-processing stage to reduce the level of noise. ArVE d has been tested through different experiments, including synthetic and real data. The synthetic data are obtained from a simulated spherical pendulum whose COR is fixed, considering both a constant and a variable IMU-joint vector, that simulates translational IMU motions due to STA. The results prove that ArVE d is adapted to obtain a vector per sample with an accuracy of 6.8 ± 3.9 mm on the synthetic data, that means an error lower than 3.5 % of the simulated IMU-joint vector. Its accuracy is also tested on the real scenario estimating the COR of the hip of 5 volunteers using as reference the results from an optical system. In this case, ArVE d gets an average error of 9.5 % of the real vector value. In all the experiments, ArVE d outperforms the published results of the reference algorithms.

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A Personalized Three-Dimensional Model of a Patient Using CT Images

Popa¹,

Duță²,

Buciu³

et al. 2023

Proceedings of the International Conference on Mechanical Engineering (ICOME 2022)

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In order to obtain a personalized three-dimensional model of a patient based on CT images, the InVesalius program was initially used, which performs the initial conversion of the analyzed tissues into a specific engineering file composed of the so-called "point cloud". This "point cloud" was imported into the Geomagic program, in which, using reverse engineering techniques, the "point cloud" was initially transformed into elementary triangular surfaces. These primary geometric structures have been edited, transformed, adapted so that, in the end, perfectly closed surfaces are obtained. It was done in this way, both for the bone structure of the head, but also for the dental structure. These complex geometries were loaded into SolidWorks, where they were originally transformed into virtual solids. These geometric structures were loaded and assembled into SolidWorks and interference solids were removed. Finally, a customized three-dimensional model was obtained on which different normal or pathological situations can be analyzed using kinematic simulations or using the finite element method.

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Virtual Model and Simulation of the Normal and Affected Human Hip Joint

Cited by 6 publications

References 0 publications

An Experimental and Virtual Approach to Hip Revision Prostheses

An Experimental and Virtual Approach to Hip Revision Prostheses

Novel IMU-Based Adaptive Estimator of the Center of Rotation of Joints for Movement Analysis

A Personalized Three-Dimensional Model of a Patient Using CT Images

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