Search results for: Silvia Fantozzi

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article

SIAMOC position paper on gait analysis in clinical practice: General requirements, methods and appropriateness. Results of an Italian consensus conference

Maria Grazia Benedetti, Ettore Beghi, Antonio De Tanti, Aurelio Cappozzo, more

Gait & Posture > 2017 > 58 > C > 252-260

Gait analysis is recognized as a useful assessment tool in the field of human movement research. However, doubts remain on its real effectiveness as a clinical tool, i.e. on its capability to change the diagnostic-therapeutic practice. In particular, the conditions in which evidence of a favorable cost-benefit ratio is found and the methodology for properly conducting and interpreting the exam are...

article

Standardization proposal of soft tissue artefact description for data sharing in human motion measurements

Andrea Cereatti, Tecla Bonci, Massoud Akbarshahi, Kamiar Aminian, more

Journal of Biomechanics > 2017 > 62 > C > 5-13

Soft tissue artefact (STA) represents one of the main obstacles for obtaining accurate and reliable skeletal kinematics from motion capture. Many studies have addressed this issue, yet there is no consensus on the best available bone pose estimator and the expected errors associated with relevant results. Furthermore, results obtained by different authors are difficult to compare due to the high variability...

article

Methodological factors affecting joint moments estimation in clinical gait analysis: a systematic review

Valentina Camomilla, Andrea Cereatti, Andrea Giovanni Cutti, Silvia Fantozzi, more

BioMedical Engineering OnLine > 2017 > 16 > 1 > 1-27

Quantitative gait analysis can provide a description of joint kinematics and dynamics, and it is recognized as a clinically useful tool for functional assessment, diagnosis and intervention planning. Clinically interpretable parameters are estimated from quantitative measures (i.e. ground reaction forces, skin marker trajectories, etc.) through biomechanical modelling. In particular, the estimation...

chapter

Validation of the Interval Deformation Technique for Compensating Soft Tissue Artefact in Human Motion Analysis

Rita Stagni, 2 Silvia Fantozzi, Angelo Cappello, Alberto Leardini

Lecture Notes in Computer Science > Surgery Simulation and Soft Tissue Modeling > Poster Session 2 > 293-301

Soft tissue artefact is the most invalidating source of error in human motion analysis. This error is caused by the erroneous assumption that markers on the skin surface are rigidly connected to the underlying bone. Several methods have been proposed in the literature to compensate for this spurious effect by mathematical modelling of the interposed soft tissues. Validation of these methods has been...

chapter

Comparison of Knee Cruciate Ligaments Models Using In-vivo Step Up-Down Kinematics

Rita Stagni, Silvia Fantozzi, Mario Davinelli, Maurizio Lannocca

Lecture Notes in Computer Science > Medical Simulation > Soft Tissue Properties and Modeling > 84-91

The knee joint is a key structure of the human locomotor system. Any lesion or pathology compromising its mobility and stability alters its function. As direct measurements of the contribution of each anatomical structure to the joint function are not viable, modelling techniques must be applied. The present study is aimed at comparing cruciate ligaments models of different complexity using accurate...

chapter

Biomechanical Modeling from In-Vivo Data

Luigi Bertozzi, Rita Stagni, Silvia Fantozzi, Angelo Cappello

Lecture Notes in Computer Science > Digital Human Modeling > Virtual Humans > 133-160

Biomechanics assists in understanding the living organ functions both in normal conditions and after alterations. It plays an important role in the development of new prostheses, tools and procedures in the diagnostic, surgical and rehabilitative fields. Although experimental approaches produce direct and reliable measurements of the variables of interest, they are invasive and can alter physiological...

chapter

Investigation of the Biomechanic Function of Cruciate Ligaments Using Kinematics and Geometries from a Living Subject During Step Up/Down Motor Task

Luigi Bertozzi, Rita Stagni, Silvia Fantozzi, Angelo Cappello

Lecture Notes in Computer Science > Computational Science – ICCS 2006 > Digital Human Modeling (DHM-6) > 831-838

The modeling approach is the only possible way to estimate the biomechanic function of the different anatomical sub-structures of the knee joint in physiological conditions. Subject-specific geometry and kinematic data were the foundations of the 3D quasi-static model adopted for the present work. A previously validated cruciate ligaments model was implemented taking the anatomical twist of the fibers...

chapter

Comparison of Knee Cruciate Ligaments Models Using Kinematics from a Living Subject during Chair Rising-Sitting

Rita Stagni, Silvia Fantozzi, Mario Davinelli, Maurizio Lannocca

Lecture Notes in Computer Science > Computational Science - ICCS 2004 > Workshop on Computational Modeling and Simulation on Biomechanical Engineering > 1073-1080

article

Characterization of the Performance of Memetic Algorithms for the Automation of Bone Tracking With Fluoroscopy

Luca Tersi, Silvia Fantozzi, Rita Stagni

IEEE Transactions on Evolutionary Computation > 2015 > 19 > 1 > 19 - 30

Reliable knowledge of in vivo joint kinematics is fundamental in clinical medicine. Fluoroscopic motion tracking theoretically permits a millimeter/degree level of accuracy in 3-D joint motion analysis, but the reliability of the local optimization algorithm [Levenberg–Marquardt (LMA)], typically used for the pose estimation, is highly operator dependent. A new memetic algorithm (MA), hybridizing...

article

Planimetric frontal area in the four swimming strokes: Implications for drag, energetics and speed

Giorgio Gatta, Matteo Cortesi, Silvia Fantozzi, Paola Zamparo

Human Movement Science > 2015 > 39 > Complete > 41-54

The purpose of this study was to use the planimetric method to determine frontal area (Ap) throughout the stroke cycle in the four swimming strokes as well as during “streamlined leg kicking”. The minimum Ap values in all strokes are similar to those assessed during “streamlined leg kicking” (about 0.13m ² ). Active drag (Da=1/2ρ C _d Ap v ² ) was then calculated/estimated based...

article

Underwater Gait Analysis: A Markerless Approach

Alberto Rigato, Zimi Sawacha, Silvia Fantozzi, Francesco Pretto, more

Gait & Posture > 2013 > 38 > Supplement 1 > S113

article

In vitro quantification of the performance of model-based mono-planar and bi-planar fluoroscopy for 3D joint kinematics estimation

Luca Tersi, Arnaud Barré, Silvia Fantozzi, Rita Stagni

Medical & Biological Engineering & Computing > 2013 > 51 > 3 > 257-265

Model-based mono-planar and bi-planar 3D fluoroscopy methods can quantify intact joints kinematics with performance/cost trade-off. The aim of this study was to compare the performances of mono- and bi-planar setups to a marker-based gold-standard, during dynamic phantom knee acquisitions. Absolute pose errors for in-plane parameters were lower than 0.6 mm or 0.6° for both mono- and bi-planar setups...

article

Markerless analysis of front crawl swimming

Elena Ceseracciu, Zimi Sawacha, Silvia Fantozzi, Matteo Cortesi, more

Journal of Biomechanics > 2011 > 44 > 12 > 2236-2242

Research on motion analysis of swimmers is commonly based on video recordings of the subject's motion, which are analyzed by manual digitization of feature points by an operator.This procedure has two main drawbacks: it is time-consuming, and it is affected by low repeatability. Therefore, the application of video-based, automatic approaches to motion analysis was investigated. A video-based, markerless...

article

Double calibration vs. global optimisation: Performance and effectiveness for clinical application

Rita Stagni, Silvia Fantozzi, Angelo Cappello

Gait & Posture > 2009 > 29 > 1 > 119-122

For clinical application the quantification of the actual subject-specific kinematics is necessary. Soft tissue artefact (STA) propagation to joint kinematics can nullify the clinical interpretability of stereophotogrammetric analysis. STA was assessed to be strongly subject- and task-specific. The global optimisation, whose performance was assessed only on simulated data, is at the basis of several...

article

Knee model sensitivity to cruciate ligaments parameters: A stability simulation study for a living subject

Luigi Bertozzi, Rita Stagni, Silvia Fantozzi, Angelo Cappello

Journal of Biomechanics > 2007 > 40 > Supplement 1 > S38-S44

If the biomechanic function of the different anatomical sub-structures of the knee joint was needed in physiological conditions, the only possible way is a modelling approach.Subject-specific geometries and kinematic data, acquired from the same living subject, were the foundations of the 3D quasi-static knee model developed. Each cruciate ligament was modelled by means of 25 elastic springs, paying...

article

Double calibration versus global otpimisation: Performance and effectiveness for clinical application

Rita Stagni, Silvia Fantozzi, Angelo Cappello

Gait & Posture > 2006 > 24 > Supplement 2 > S17-S18

article

Propagation of anatomical landmark misplacement to knee kinematics: Performance of single and double calibration

Rita Stagni, Silvia Fantozzi, Angelo Cappello

Gait & Posture > 2006 > 24 > 2 > 137-141

Soft tissue artefact and anatomical landmark misplacement have been recognized as the most critical sources of error in gait analysis. The double calibration method was recently proposed to compensate for soft tissue artefact in knee kinematics. This compensation method resulted very effective in the absence of anatomical landmark misplacement.The purpose of the present work was to assess the effectiveness...

article

Effect of different inertial parameter sets on joint moment calculation during stair ascending and descending

Silvia Fantozzi, Rita Stagni, Angelo Cappello, Alberto Leardini

Medical Engineering and Physics > 2005 > 27 > 6 > 537-541

The reliability of internal joint moment calculation in gait analysis during daily living activities is fundamental for clinical decisions based on joint function. This calculation, obtained by means of the inverse dynamics, depends on several modelling factors, such as assumptions on the segments and on the relevant joints constituting the kinematic chain. In this study, the effect of five different...

article

Quantification of soft tissue artefact in motion analysis by combining 3D fluoroscopy and stereophotogrammetry: a study on two subjects

Rita Stagni, Silvia Fantozzi, Angelo Cappello, Alberto Leardini

Clinical Biomechanics > 2005 > 20 > 3 > 320-329

Background. Soft tissue artefact is the most invalidating source of error in human motion analysis using optoelectronic stereophotogrammetry. It is caused by the erroneous assumption that markers attached to the skin surface are rigidly connected to the underlying bones. The quantification of this artefact in three dimensions and the knowledge of how it propagates to relevant joint angles is necessary...

article

Fluoroscopic and gait analysis of the functional performance in stair ascent of two total knee replacement designs

Silvia Fantozzi, Maria Grazia Benedetti, Alberto Leardini, Scott Arthur Banks, more

Gait & Posture > 2003 > 17 > 3 > 225 - 234

Understanding total knee replacement mechanics and their influence on patient mobility requires accurate analysis of knee joint kinematics and traditional full body kinematics and kinetics. Three-dimensional fluoroscopic and gait analysis techniques were carried out on patients with either mobile bearing or posterior stabilized knee prostheses during stair ascent. Statistically significant correlation...

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