Previous Webcasts
 

Previous webcasts that has been recorded are available here for download. Notice that you must have a Webuser login to access the files.

Biomechanical Outcome of Total Hip Replacements using a Patient-Specific Musculoskeletal Model (Tim Weber, OTH Regensburg, 30. September, 2014)
Presentation (4Mb), Playback (68Mb), YouTube
In this Webcast Tim Weber from the Laboratory for Biomechanics at the OTH Regensburg will present a study that compares different surgical procedures and the biomechanical outcome after total hip replacements. We investigated the biomechanics of walking after THR using patient-specific musculoskeletal models of human gait. These models were facilitated to compare two surgical techniques for THR. We retrieved patient-specific musculoskeletal model using the AnyGait Model (AnyBodyModelingSystem, AMMRV 1.6). This study was conducted in cooperation of the Laboratory of Biomechanics, OTH Regensburg (Tim Weber, Sebastian Dendorfer), the Department of Orthopedic Surgery, University Medical Center Regensburg (Tobias Renkawitz, Tim Weber, and Joachim Grifka), the University of Groningen (Bart Verkerke, Sjoerd Bulstra), The Netherlands and the University of Twente, the Netherlands (Bart Verkerke).

Patient-specific Musculoskeletal Modelling of Total Knee Arthroplasty using Force-dependent Kinematics (Michael Skipper Andersen, Aalborg University, 09. September, 2014)
Presentation (2Mb), Playback (85Mb), YouTube
In this webcast Michael Skipper Andersen will present a patient specific model to predict knee contact forces for Total Knee Arthroplasty. The bone geometry of tibia, femur and patella was based on CT images to scale muscle attachments nodes nonlinearly. An optimisation procedure in AnyBody linearly scaled the remaining model segments based on surface marker locations. A detailed tibiofemoral and patellofemoral joint model, including contact and ligaments, allowed estimation of both muscle, ligament and contact forces, and knee joint kinematics using Force-dependent Kinematics (FDK). By employing quasi-static force-equilibrium, FDK extends inverse dynamics to allow computation of small movements stabilized by soft tissue within joints. In this study, FDK was employed to compute all tibiofemoral and patellofemoral movements except knee flexion/extension, which was prescribed. The muscle strengths were systematically reduced for both knee flexors and extensors as reported for total knee arthroplasty patients, and a strong dependence of the knee contact forces on this strength was observed. The predicted tibio-femoral contact forces showed a very good correlation to the in-vivo measured data. Medial and lateral forced matched for standard gait and a measured right turn.

Musculoskeletal forces in the human body during Tokyo’s daily life of commuting (Julien Groud, Application Engineer, Terrabyte, Japan, 13. May, 2014)
Presentation (2Mb), Playback (52Mb), YouTube
The human body is exposed to various forces during daily activities of commuting. Julien Groud from Terrabyte will give a presentation about musculoskeletal loads in the human body during typical forms of daily commuting through Tokyo.

Spine Parameter: The influence of vertebral geometrical parameters on lumbar spine loading (M.Sc. Michael Putzer, Prof. Sebastian Dendorfer, Laboratory for Biomechanics, Ostbayerische Technische Hochschule Regensburg, Germany, 08. April, 2014)
Presentation (3Mb), Playback (220Mb), YouTube
Musculoskeletal simulations are frequently used to determine the internal loads of the human body. However, the accuracy of the anatomical dataset and actually often the lack of data lead to some uncertainty of the underlying models. In this study we investigated the influence of vertebral geometrical parameter on lumbar spine loads. Therefore, an lumbar spine model has been derived and the effect of altered geometrical parameters has been analyzed.

Exoskeletons: Reducing joint and muscle loads while performing difficult tasks (Senior Consultant Amir Al-Munajjed, PhD, AnyBody Technology, 25. February, 2014)
Presentation (2Mb), Playback (49Mb), YouTube
Exoskeletons can be used in various industrial, medical and military applications to assist and improve the human body's function. In this webinar, we will illustrate how the AnyBody Modeling System can be used in the development process of exoskeletons and give a summary of selected user cases: Optimization of exoskeleton kinematics, Simulation of human body-exoskeleton interface forces, Compute reduction of joint and muscle loads, while performing difficult tasks

Estimating edge-loading risk in patients with metal-on-metal hip resurfacing (Stephen Mellon, University of Oxford, and Michael Skipper Andersen, Aalborg University, 12. November, 2013)
Presentation (3Mb), Playback (30Mb), YouTube
This webcast details the method employed to investigate the contribution of patient-specific motion patterns to edge-loading risk in patients with metal-on-metal hip resurfacing arthroplasty. Fifteen subjects were recruited for motion analysis. The musculoskeletal model used a three-stage procedure. First, the patient specific joint kinematics were estimated based on a stick-figure model constructed from the standing reference frame and the estimated hip joint centres The Twente lower extremity model (TLEM) was nonlinearly morphed using radial basis functions to match the segment lengths and joint parameters of the stick-figure model. Inverse dynamic analysis was performed for the morphed TLEM model with the measured ground reaction forces as external loads and polynomial muscle recruitment criterion of power 3 to estimate muscle and joint contact forces. The distance of the hip contact force from the edge of the acetabular component during gait and sit-to-stand was used to estimate the edge-loading risk.

The new release of the AnyBody Modeling System. Version 6.0 (Michael Damsgaard, 15. July, 2013)
Presentation (1Mb), Playback (13Mb), YouTube
A short introduction to the most important new features in the AnyBody Modeling System (AMS), v.6.0, and the included version 1.6 of the AnyBody Managed Model Respository (AMMR).

TLEMsafe: An integrated system to improve predictability of functional recovery of patients requiring musculoskeletal surgery (Prof. dr. Nico Verdonschot, 05. March, 2013)
Presentation (5Mb), Playback (55Mb)
Started in 2010 TLEMsafe aims to create a patient-specific surgical navigation system, based on innovative ICT tools, for training, pre-operative planning and execution of complex musculo-skeletal surgery. The project utilizes and further develops the Twente Lower Extremity Model (TLEM), a recently developed musculo-skeletal computer model, to represent the patient-specific situation. The next step is to allow the surgeon to virtually operate on the patient-specific model, after which the model can predict the functional effect of this intervention. In this way, the surgeon can test various surgical scenarios before actually operating. Once the optimal surgical plan is selected, the plan is fed into a computer assisted navigation system that allows the surgeon to reproduce the selected surgical plan for his patient during the actual surgery.

Orthopedic AnyBody Applications for the Spine (Tony Petrella, 07. November, 2012)
Presentation (3Mb), Playback (28Mb), YouTube
Many AnyBody users are using musculoskeletal modeling to gain insight and solve spine related problems. This webinar will give you an overview of this body of work and discuss some of the results.

The new SolidWorks2AnyBody translator add-in (Moonki Jung, 17. October, 2012)
Presentation (4Mb), Playback (47Mb), YouTube
This webcast demonstrates SolidWorks2AnyBody. A new powerful SolidWorks add-in application to translate your CAD models into The AnyBody Modeling System.

The new Glasgow-Maastricht AnyBody foot model (Sylvain Carbes, 20. September, 2012)
Presentation (2Mb), Playback (36Mb), YouTube
This webcast presents a detailed AnyBody musculoskeletal foot model which includes all bones and joints of a real foot. Developed in collaboration with Glasgow Caledonian University and University Hospital Maastricht and referred to as the "Glasgow-Maastricht foot model" this model can be driven by motion capture data and uses combined force plate/pressure plate for accurate loading of the different joints. Built-in scaling allows the user to reproduce principal foot deformities such as flat foot and hallux valgus. The high detail level of the model and a built-in scaling protocol allows the user to investigate a wide range of parameters like joints motion and load, muscles activation, both in healthy and pathologic feet.

Orthopedic AnyBody Applications for the Hip (Tony Petrella, 05. September, 2012)
Presentation (3Mb), Playback (49Mb)
Many AnyBody users are using musculoskeletal modeling to gain insight and solve hip and THR related problems. This webinar will give you an overview of this body of work and discuss some of the results.

The New Release of the AnyBody Modeling System, version 5.2 (Amir A. Al-Munajjed, 28. June, 2012)
Presentation (4Mb), Playback (51Mb), YouTube
This webcast will highlight the new features of the latest AnyBody release utilizing model examples from product design optimization, ergonomic analysis, creating physiological finite element loads, and pre-op orthopedic surgery planning.

AnyGait: A powerful gait lab application to process motion capture trials (Amir A. Al-Munajjed, 31. May, 2012)
Presentation (3Mb), Playback (52Mb), YouTube
This webinar will walk you through AnyGait, a gait analysis application targeting users who have a need for repetitive processing of trial data. Running inside the AnyBody Modeling System AnyGait uses motion capture including ground reaction forces as input in the form of C3D files. AnyGait is pre-setup with a specific marker protocol, however, a number of standard setups are available for use with different MoCap systems such as Vicon, Qualysis, and SIMI, and the system can easily be customized to other protocols. AnyGait exports the most important results in a condensed and easy-to-read form. Currently, this standard output contains joint angles of ankle, knee, and hip, joint reaction forces of ankle, knee, and hip, and muscle activity of major muscle branches, but it is customizable to meet the needs and requirements of a given laboratory, application, and patient group.

Modeling and analysis of non-conforming joints in AnyBody II (John Rasmussen, 29. September, 2011)
Presentation (1.1Mb), Playback (12Mb), Get WebEx Player, YouTube
In this webcast we continue the September 8 presentation of non-conforming joint modeling. This presentation primarily takes the form of a bottom-up demo session of how the new facilities are actually used in a modeling process. We use simple examples to demonstrate the definition of contact conditions and force-dependent kinematics analyses.

Modeling and analysis of non-conforming joints in AnyBody I (John Rasmussen, 8. September, 2011)
Presentation (0.4Mb), Playback (19Mb), Get WebEx Player, YouTube
In this webcast we take a top-down look at what can be accomplished with the new capabilities for modeling and analysis of non-conforming joints. One of the inventors of the AnyBody Modeling System, Prof. John Rasmussen, will demonstrate the new features using the example of a knee prosthesis. We will be looking into force-dependent kinematics, which allows the system to determine local deformations in joints caused by the combination of external forces, muscle forces and reactions from ligaments and other passive structures. We also review the new surface contact measures in the AnyBody Modeling System. Together, these facilities provide exciting new possibilities for analysis of the mechanics of complex joints, such as knees, shoulders, mandibular joints and spinal disks. Notice there will be a follow-up event to this webcast on Sep. 29.

Preview of The AnyBody Modeling System version 5.1 (Michael Damsgaard, 22. June, 2011)
Presentation (2.3Mb), Playback (14Mb), Get WebEx Player, YouTube
In this presentation we will be taking a look at the upcoming AnyBody Modeling System version 5.1 which is planned for release in August. One of the key new features is for analysis of non-conforming joints using the Force-Dependent Kinematics solver in combination with a surface contact model. But we also take a look at other new features of the AMS and the work we are doing on the modeling side.

Analyzing non-conforming anatomical and prosthetic joints in the AnyBody Modeling System (Michael Skipper Andersen, 5. April, 2011)
Presentation (2.0Mb), Playback (23Mb), Get WebEx Player, YouTube
Most musculoskeletal models presume idealized joints, such as a revolute joint for the knee and a spherical joint for the hips. However, several anatomical and prosthetic joints are non-conforming to such an extent that the forces significantly influence the detailed joint kinematics and the joint-s internal force equilibrium. This is the case for joints such as spinal disks, knees and many shoulders. For instance, in the knee, the internal motions are governed by a complex interaction between the muscle actions, cartilage contact mechanics, ligament forces and soft tissue deformations. Capturing all these effects in a realistic model using only kinematic constraints is very difficult, if not impossible. In this webcast, we demonstrate a novel method called Force-dependent Kinematics (FDK) implemented in the AnyBody Modeling System version 5.0. This method allows motions in user-defined degree-of-freedom to be resolved through force equilibrium, rather than by kinematic constraints, while still enabling computation of the muscle and reaction forces. We take a hands-on approach and perform a live demonstration of how to use FDK for model development.

Patient-specific morphing of musculoskeletal models (John Rasmussen, 1. March, 2011)
Presentation (2.1Mb), Playback (11Mb), Get WebEx Player, YouTube
In this webcast, John Rasmussen demonstrates the implementation of this technology into the AnyBody Modeling System and we look at the opportunities the technology opens for patient-specific surgical planning and implant design.

Streamlining gait analysis with the AnyBody Modeling System v.5 (Soeren Toerholm, 26. January, 2011)
Presentation (2.3Mb), Playback (31Mb), Get WebEx Player
This webcast demonstrates a gait analysis workflow including definition of marker protocol, import of motion data, optimized individualization of the model, and musculoskeletal analysis in the new AnyBody Modeling System version 5. A few sample results of the analysis will wrap up the live demo. In addition, the full scope of results available from musculoskeletal analysis is described using an overview of the underlying state-of-the art anatomical model and the experimental validation supporting it.

A lumbar spine model with facets joints and a dynamic stabilization device (Sebastian Dendorfer, 21. December, 2010)
Presentation (3.5Mb), Playback (11Mb), Get WebEx Player, YouTube
This presentation will bring an insight to recently added features and methods available in Anybody Modelling System using a lumbar spine example. First, we will shown a computational prediction of spine curvature and show the effect of the muscles on human posture. Secondly, this approach will be employed to highlight the effect of different designs of spinal fixation devices. Moreover, an overview of how to apply this modelling strategy in conjunction with two different formulations of the facet joints will be given.

Pressure ulcer research from seated posture to buttock tissue strain (Christian Gammelgaard Olesen, 1. December, 2010)
Presentation (4.0Mb), Playback (10Mb), Get WebEx Player, YouTube
Pressure ulcers are a frequent complication to spinal cord injury (SCI) patients. It is well acknowledged that sustained mechanical loading of the soft tissues causes pressure ulcers. When sitting on a chair, support forces are acting between the buttocks and the chair. Posture changes cause changes in these forces and thereby to the loads transferred through the soft tissue and into the bony prominences. The soft tissue is strained by the loading, which causes ulceration and, when the load is sustained, a pressure ulcer. This webcast will demonstrate how an AnyBody model can predict the influence of posture on the support forces and consequently contribute to prevention of pressure ulcers.

Modeling techniques in AnyBody (John Rasmussen, 28. October, 2010)
Presentation (0.7Mb), Playback (45Mb), Get WebEx Player, YouTube
Nothing describes software better than watching it being used. In this webcast, one of the inventors of the AnyBody Modeling System, Prof. John Rasmussen, demonstrates the interactive modeling techniques on the system by live development of a model. The webcast is a great introduction for new or prospective users, and even if you are an experienced AnyBuddy, chances are that you will see a useful trick or two that you did not know about.

Functional outcome analyses of navigated minimally invasive total hip endoprosthesis using musculoskeletal modeling (Tim Weber, 19. October, 2010)
Presentation (3.3Mb), Playback (20Mb), Get WebEx Player, YouTube
The purpose of the prospective part of this study was to investigate a novel approach in order to evaluate the functional outcome of minimally invasive navigated hip surgery by combining clinical gait analysis with musculoskeletal modeling and clinical outcome scores. The retrospective part draws its focus on the accuracy of medical imaging (Ct vs. XRay). The aim of this part was to examine the potential of x-ray imaging for biomechanical operational planning of total hip replacement by means of musculoskeletal modeling.

Musculoskeletal Loads within the Rats Hind Limb (Tim Wehner, 21. September, 2010)
Presentation (1.4Mb), Playback (7Mb), Get WebEx Player, YouTube
The rat is of increasing importance for experimental studies on fracture healing. The healing outcome of long bone fractures is strongly influenced by mechanical factors, such as the interfragmentary movement. This movement depends on the stability of the fracture fixation and the musculoskeletal loads. The fixation stability can be easily determined through in vitro tests, however little is known about the loads in rats. This webcast will present the development of an inverse-dynamic model of the rats hindlimb using AnyBody to be able to estimate the internal loads inside the rats femur during gait.

New features in version 4.2 of the AnyBody Modeling System (Soeren Toerholm, 2. June, 2010)
Presentation (2.4Mb), Playback (34Mb), Get WebEx Player, YouTube
The AnyBody Modeling System version 4.2 and the associated version 1.2 of the model repository have just been released. They contain important and long-awaited improvements of capabilities and models. This presentation introduces the most important updated features, and a few of the features of special interest are demonstrated, namely: New functionality to view and work with C3D files for motion analysis. New facilities for viewing the model. Easier editing and setting of model parameters. How to add weights on soft kinematic constraints to handle occluded markers from motion capture data. How to model pathological co-contraction of muscles by adding auxiliary constraints in the muscle recruitment.

Osteoarthritic knee kinematics and kinetics (Peter R. Worsley, 18. May, 2010)
Presentation (2.0Mb), Playback (20Mb), Get WebEx Player, YouTube
It has long been established that individuals who suffer from osteoarthritis present with altered kinematics and kinetics during gait. Inverse dynamic analysis through AnyBody gives the opportunity to estimate the magnitude of changes that occur in the movement patterns of patients suffering from osteoarthritis during activities of daily living. This webcast will detail the process of converting motion capture to MS models for the healthy and osteoarthritis patients, and ways in which the data can be verified and compared to that of healthy individuals.

Workplace Ergonomics - Stilt Walking (John Z. Wu, 7. April, 2010)
Presentation (1.8Mb), Playback (22Mb), Get WebEx Player, YouTube
Stilts are commonly used at construction sites to raise the workers to a higher level above ground to increase the efficiency for many tasks. Some epidemiological studies indicate that the use of stilts may place workers at increased risk for knee injuries or may increase the likelihood of trips and falls. However, no biomechanical analysis has been performed to examine the effects of the stilts walking on the musculoskeletal loading. The study presented in this webcast hypothesizes that the use of stilts in walking will increase the musculoskeletal loadings in the lower limbs. This is investigated in the AnyBody Modeling System.

Physiological responses to bicycle design (Ernst Albin Hansen, 25. March, 2010)
Presentation (1.1Mb), Playback (21Mb), Get WebEx Player
An expert on bicycle biomechanics presents his recent investigation where AnyBody was used to explain remarkable experimental findings that the Biopace chain wheel significantly reduces the blood lactate concentration. Bicycle design is an obvious area for biomechanical simulation and the chain wheel shape is just one of many possible design parameters that can be investigated.

AnyGait: Getting quickly from mocap to individualized musculoskeletal analysis (John Rasmussen, 15. December, 2009)
Presentation (0.4Mb), Playback (56Mb), Get WebEx Player
This event will follow up on the previous webcast on motion capture data in the AnyBody Modeling System by demonstrating the use of two novel models that make import of motion data from a typical gait lab and individualization of the model to the test subject in question a matter of a few minutes.

New in Version 4.1 - Easy use of Motion Capture Data (John Rasmussen, 3. December, 2009)
Presentation (0.4Mb), Playback (36Mb), Get WebEx Player
Version 4.1 of the AnyBody Modeling System contains ground-breaking new technology for handling redundant kinematic constraints. This simplifies the driving of models by motion capture data significantly and improves accuracy. This webcast demonstrates how C3D data is imported and attached to the model and how we can take advantage of their richness to identify unknown parameters in the model.

A Multi-segment Musculoskeletal Foot Model for Clinical Gait Analysis (Prabhav Saraswat, 28. October, 2009)
Presentation (1.3Mb), Playback (28Mb), Get WebEx Player, YouTube
Several full body musculoskeletal models have been developed for research applications and these models may potentially be developed into useful clinical tools to assess gait pathologies. Existing full-body musculoskeletal models treat the foot as a single segment and ignore the motions of the intrinsic joints of the foot. This assumption limits the use of such models in clinical cases with significant foot deformities. Therefore, a three-segment musculoskeletal model of the foot was developed in the AnyBody Modeling System to match the segmentation of a recently developed multi-segment kinematic foot model.

Influence of clavicle midshaft fracture pattern on the superior plate stabilization (Carsten Englert and Sebastian Dendorfer, 2. July, 2009)
Presentation (8Mb), Playback (10Mb), Get WebEx Player, YouTube
From the clinical point of view, superior plate fixation of clavicular midshaft fracture is easy in comparison to the anterior plate position on the clavicular. However, in multiple fragment fractures or in cases with a diagonal fracture line in the mid region of the clavicle failures of superior plate stabilization have been reported. Mostly screw pull-outs staring from medial have been observed. That raises the question, if the superior plate position for clavicle midshaft fractures shall only be used for simple (right angle) fracture types. Both clinical as well as biomechanical aspects will be discussed in this talk. The loading conditions on the bone-implant construct are evaluated during activities of daily living using the AnyBody Modeling System. Following this, a CT based Finite Element Model is loaded with a complex load case including all muscle forces acting on the clavicle and the influence of the different fracture types is investigated. The implications on clinical praxis will be discussed.

Features of muscle recruitment algorithms (John Rasmussen, 25. June, 2009)
Presentation (1.2Mb), Playback (30Mb), Get WebEx Player, YouTube
Recruitment in redundant muscle systems is an issue that tends to spark heated discussions between biomechanists. In this webcast we review the fundamental features of different algorithms for muscle recruitment. We look at the different opportunities for defining the optimization problem and show how they lead to qualitatively different solutions to the problem. We also introduce the new muscle recruitment algorithms in the AnyBody Modeling System ver. 4.0 and show how the user can control the problem definition.

Seated Human Model Validation (Christian Gammelgaard Olesen, 19. May, 2009)
Presentation (2.6Mb), Playback (23Mb), Get WebEx Player, YouTube
The seated model available in the AnyBody repository calculates reaction forces between the human body and the chair. The model can be used for various applications, e.g. design of wheelchairs, office chairs, and automotive chairs. To be sure that a model give the right output, it has to be validated. In order to validate the seated AnyBody model an instrumented chair was built and experiments were carried out. The experiments included different seated postures, varying seat and backrest angle, and foot and backrest height. The experimental postures were modeled and the results were compared.

AnyBody Model Library updates (Soeren Toerholm, 22. April, 2009)
Presentation (1.7Mb), Playback (46Mb), Get WebEx Player, YouTube
This webcast gives an overview of the new, updated AnyScript Model Repository, which offers enhanced user friendliness. We will explain the structuring of the models, the available body parts, and the different sample applications. The new model structure which is supported by new AnyScript language features makes it much easier to create and maintain any updated body part and muscle configuration combinations which the user may want to define.

Anthropometrical Scaling of Musculoskeletal Models (John Rasmussen, 19. March, 2009)
Presentation (0.5Mb), Playback (28Mb), Get WebEx Player, YouTube
This webcast presents ongoing work on reliable scaling of models to represent individual subjects or percentiles of the population. The scaling is in terms of body dimensions as well as strength, and new results and features are presented in terms of scaling to bony landmarks and scaling based on motion capture data.

Joint Forces within The Ankle During Level Walking (Mike Arakilo, 10. December, 2008)
Presentation (2Mb), Playback (23Mb), Get WebEx Player
Total Ankle Replacement (TAR) has been shown to lack the long term reliability of other implants. Many efforts have been made to improve the design. These have included simply exploiting more anatomically shaped prosthesis; however understanding the fundamental mechanics of the joint based upon robust experimental data is perhaps a more promising approach. Current data describing ankle joint forces have been calculated based on questionable assumptions from a very limited number of investigations dating back to the 1970s. The purpose of this study is to develop a more sophisticated computer simulation of the ankle joint to provide more reliable data than currently exist.

Implementation of facet joints in a lumbar spine model (Mark de Zee, 25. September, 2008)
Presentation (3Mb), Playback (10Mb), Get WebEx Player
This work presents a new methodology for implementation of facet joints in the lumbar spine model developed by De Zee et al. (2007: J Biomech. 40, 1219-1227). It enables the facet joint forces to become part of a redundant system of equilibrium equations for the entire system including the muscles. This redundant system is subsequently solved uniquely thereby making it possible to analyze the effect of whole body movements and loads on facet joint loading for the whole lumbar spine together with its muscles.

TLEM: A new detailed lower extremity model (Sebastian Dendorfer, PhD, 20. August, 2008)
Presentation (2Mb), Playback (8Mb), Model (11Mb), Get WebEx Player, YouTube
The new Twente Lower Extremity Model (TLEM) is based on a recently published morphological dataset on muscle and joint parameters by Martijn Klein-Horsman from the University of Twente, The Netherlands [1]. The AnyBody implementation of the model was initiated by Karin Gorter, a Master Student, also from the University of Twente, during a three month stay at Aalborg University and is now being finished by AnyBody Technology. TLEM consists of 159 muscles and 6 joint degrees of freedom. It has been validated against "state of the art" literature with respect to its biomechanical performance and first applications in gait and cycling deliver very convincing results. The model is currently being used in a project with the European Space Agency (ESA), which aims at analyzing the relationship between mechanical boundary conditions and bone loss during space flights. TLEM itself will be public and we are looking forward to include the new lower extremity model in the next update of the Repository. [1] Horsman, M. D. K.; Koopman, H. F. J. M.; van der Helm, F. C. T.; Prose, L. P. & Veeger, H. E. J. (2007), "Morphological muscle and joint parameters for musculoskeletal modelling of the lower extremity.", Clin Biomech (Bristol, Avon) 22(2), 239--247.

The AnyBody Repository, version 7 (Soeren Toerholm, PhD, 25. June, 2008)
Presentation (6Mb), Playback (11Mb), Get WebEx Player
This webcast gives an overview of the AnyScript Model Repository version 7. It explains the structure of the models, the available body parts, and the different sample applications. In terms of new body parts the repository contains a new neck model.

Simulating the dynamic muscle force in an index finger during tapping (Dr. John Wu, 22. May, 2008)
Presentation (3.9Mb), Playback (29Mb), Get WebEx Player, YouTube
Since musculoskeletal disorders of the upper extremities are believed to be associated with repetitive excessive muscle force production in the hands, understanding the time-dependent muscle forces during key tapping will help to explore the mechanisms of disease initiation and development. In the current study, we analyzed the dynamic muscle forces in an index finger during typing using a universal finger model developed on a platform of AnyBody. Seven muscles were included in the proposed model: flexor digitorum profundus (FP), flexor digitorum superficials (FS), extensor indicis (EI), extensor digitorum communis (EC), radial interosseous (RI), ulnar interosseous (UI), and lumbrical (LU). The time histories of impact force at the fingertip in the published studies are applied to drive the model. Our analysis indicates that the power generated by FP, EC, and EI muscles are predominant among all muscles, while the power generated in MCP joint is predominant among all three joints. The predicted time-histories of muscle forces agree well with the EMG measurements in the literature. Our results suggested that the muscle force is mainly induced by the impact force at the fingertip during tapping, rather than due to the mass moment inertia of the finger section.

Quantifying strain in the anterior cruciate ligament during voluntary and forced movements (Maja Rose, 29. April, 2008)
Presentation (1.7Mb), Playback (5Mb), Get WebEx Player
The anterior cruciate ligament is the most frequently injured knee ligament. Regardless of the great number of injuries, the trauma mechanisms are still unclear. A better understanding of the aetiology might increase the possibilities to prevent injuries and imrpove the rehabilitation strategies. This webcast presents a final year project from Institute of Mechanical Engineering of Aalborg University. The objective was to determine which trauma mechanisms have the potential to rupture the anterior cruciate ligament by quantifying the strain in the ligament during both voluntary and forced movements.

Cross-country skiing biomechanics using measurement driven full-body simulations (Joakim Holmberg, 19. February, 2008)
Presentation (2.6mb), Playback (12Mb), Get WebEx Player, YouTube
Studies of cross-country skiing biomechanics is traditionally based on measurements alone. Performing musculoskeletal simulations of cross-country skiing enhances the possibilities for studies of technique, equipment and injury prevention. The simulation model is based on the full-body model from the AnyBody model repository and measured boundary conditions (motion and pole forces). Results show consistency with literature and also reveal new information of load distribution between muscles. This application shows that it can be possible to use inverse dynamics and static optimization (i.e. the technology behind AnyBody) on rather fast and complex full-body motion. Furthermore, it shows one way of driving symmetrical movements that takes place mainly in the sagittal plane.

Validation of Hip Joint Force Simulation by Gait Analysis (Catherine Manders, 29. January, 2008)
Presentation (2.0mb), Playback (7mb), Get WebEx Player, YouTube
This webcast describes a study in which the validity of two gait models created in the musculoskeletal modelling programme AnyBody was investigated. The models used recorded force plate data and were driven kinematically with motion capture data. The contact force at the hip was calculated and compared to experimental data from instrumented hip prostheses available in the literature. Although there were some discrepancies between the model results and the literature data, the model results fell within the limits of patient to patient variation. To investigate the variation further, the torque at the hip, which is calculated directly from the force plate and kinematics data and is independent of the muscle recruitment model, was determined from the model and compared to the torque calculated for the literature subjects.

Coupling the AnyBody and ANSYS Software Suites for Biomedical Applications (Can Oszan, 5. December, 2007)
Presentation (1.6mb), Playback (9mb), Get WebEx Player
In the field of biomedical engineering, there are often more many applicable engineering softwares to choose from but none are comprehensive over the full spectrum of biomedical design. The ANSYS software suite has several advanced mechanical analysis tools but it can be difficult to find or create ready models of the biological world sufficient for ANSYS analysis. The AnyBody software application provides a versatile rigid body model of the skeleton as well as the muscles for detailed biomechanical analysis but does not provide facilities for neither deformable elements nor structural analysis. For a situation such as evaluating an implant design, neither of these software suites would provide a full solution. The best approach is to combine the benefits of both software by modeling the implant in both suites in an interdependent, coupled approach. This solution combines the results of the implant in the macro scale, by its effect on the entire body, as well as the micro level through finite element analysison the implant.

Adjusting the Axle Placement in Wheelchair Users to Minimize Shoulder Joint Forces (Sarah Sullivan-Dubrowsky, 8. November, 2007)
Presentation (1.5mb), Playback (10mb), Get WebEx Player, YouTube
This webcast is a demonstration of the construction and validation of a model of an individual with paraplegia propelling a wheelchair. This anthropometrically accurate model is driven kinematically with motion capture data and kinetically with recorded x-, y-, and z- forces from force-sensing push rims. Two validation techniques are used to build confidence in the model: 1.) experimental subject EMG activity is compared to corresponding muscle activity as calculated by AnyBody, and 2.) the torque (as opposed to the individual force-components) as calculated from the force-sensing push rims drives the model and the resulting force components are compared to the original push rim force outputs. With confidence in the model, we look at utilizing the AnyBody modeling system for quantitatively comparing the axle placement in wheelchair set-up and its effect on shoulder joint forces.

Development of a musculoskeletal simulator for swimming (Dr. Motomu Nakashima, 3. October, 2007)
Presentation (0.6mb), Playback (26mb), Get WebEx Player, YouTube
There have been no studies of the musculoskeletal analysis for swimming so far because of the difficulty to estimate the fluid force acting on the swimmer's whole body, although such analysis will provide useful information for the athlete swimmer's training and coaching. Therefore, we developed a musculoskeletal simulator for swimming by integrating the AnyBody Modeling System and our simulation model SWUM (SWimming hUman Model), which enables to calculate fluid force acting on the whole body during swimming. In this webcast, how to integrate AnyBody and SWUM, simulation results of animations for crawl, breast, back and butterfly strokes, and a comparison with EMG are presented.

A detailed rigid-body cervical spine model based on inverse dynamics (Dr. Mark de Zee, 18. September, 2007)
Presentation (3.5mb), Playback (9.4mb), Get WebEx Player, YouTube
This webcast presents a detailed model of the cervical spine, which recently has been presented at the ISB congress in Taipei. We will go through the model and its assumptions including the muscles and a preliminary validation. Moreover an application will be presented where we try to predict neuromuscular adaptation of experimentally induced neck pain using the cervical spine model.

Assessing the Importance of Motion Dynamics for Ergonomic Analysis of Manual Materials Handling Tasks (David Wagner, 14. August, 2007)
Presentation (1.6mb), Playback (11mb), Get WebEx Player
Most current applications of human figure models for ergonomic assessments focus on the analysis of a static posture. However, many tasks of ergonomic interest also include a dynamic component and it is left to the user to assess whether that dynamic contribution is negligible to the results of the analysis. Unfortunately, most commercial ergonomics packages do not include the capacity to perform dynamics analysis making it difficult to quantitatively justify the static assumption. In this webcast, we look at utilizing the AnyBody modeling system for quantitatively comparing a dynamic and assumed static analysis. Comparisons between low back moments and muscle forces for an asymmetric lifting task are presented.

Online Modeling Demo (Dr. Soeren Toerholm, 30. May, 2007)
Presentation (0.4mb), Playback (67mb), Get WebEx Player
This webcast is an online demonstration of the construction of a model turning a hand wheel based on the existing model library. We grab the existing standing model from the repository, define the hand wheel, hook the human model up with the wheel, and modify the kinematic constraints of the model such that the hand movement is given by the kinematics of the wheel.

Validation of the AnyBody version of the Dutch Shoulder Model by the in-vivo measurement of GH contact forces by Bergmann et al. (Prof. John Rasmussen, 26. April, 2007)
Presentation (0.2mb), Playback (7.2mb), Get WebEx Player, YouTube
Bergmann et al recently published the first results of in-vivo measurement of gleno-humeral contact forces using an instrumented shoulder implant. In this presentation we compare the data of Bergmann et al. with results from AnyBody. We specifically look at the contact forces during abduction and their dependency on choice of muscle recruitment criterion.

Biomechanics and Computer-Aided Ergonomics (Prof. John Rasmussen, 12. April, 2007)
Presentation (0.6mb), Playback (12.0mb), Get WebEx Player, YouTube
Note: This presentation is an English language version webcast presentation of Prof. John Rasmussen's inaugural lecture presented at Aalborg University, March 27, 2007. Computer-Aided Engineering (CAE) allows us to analyze almost any technical property of a product. However, the human interface to the product, the ergonomics, has so far eluded most attempts of mathematical modeling due to its mechanical complexity and the involvement of the human central nervous system. Therefore, ergonomics has remained a quantitative, experience-based science. This is all about to change. It is now possible to reliably analyze the biomechanics of the human body in conjunction with its environment, and it is even possible to optimize products to provide maximum safety, maximum comfort, maximum usability and other ergonomics-type properties. Ergonomics is becoming an engineering discipline, and CAE in the future will include the concept of Computer-Aided Ergonomics.

Kinematic Analysis of Over-determinate Systems (Michael Skipper Andersen, 22. February, 2007)
Presentation (0.6mb), Playback (6.0mb), Get WebEx Player, YouTube
When it is desired to drive a musculo-skeletal model from measured marker trajectories from a motion capture experiment, it is very often the case that the resulting set of kinematic equations is over-determinate and the solution set is empty. To accommodate this problem, some compromise has to be made, i.e. either by excluding some of the measured markers from consideration or allowing some of the equations to be violated. In this webcast, we will demonstrate a general method for handling over-determinate mechanical systems. The presented formalism includes forward- and inverse- kinematics as special cases and also allows for analysis of both open and closed kinematic chains.

Scaling strength in human simulation models (Dr. Kenneth Meijer, 17. January, 2007)
Presentation (0.8mb), Playback (7.9mb), Get WebEx Player
Simulating human movement, with multi-body models, enables virtual experiments that are too difficult, costly or dangerous to perform in reality. When simulation models are used for subject specific goals, like planning a rehabilitation intervention, it is important that they are based on subject-specific data. Therefore, accurate strength scaling, accounting for subject specific differences, is required. Unfortunately, current strength scaling methods are poorly validated. The aim of this study was to develop scaling laws of increasing complexity and validate them with experimental data on upper leg and arm strength.

A generic detailed rigid-body lumbar spine model (Dr. Mark de Zee, 4. December, 2006)
Presentation (1.7mb), Playback (7.3mb), Get WebEx Player, YouTube
This webcast presents a detailed model of the lumbar spine, which recently has been published in the Journal of Biomechanics. We will go through the model and its assumptions including the muscles, intra-abdominal pressure and validation. With the presented model it will be possible to investigate a range of research questions, because the model is relatively easy to share and modify, available in the public domain repository.

The Seated Human Project (Dr. John Rasmussen, 20. November, 2006)
Presentation (0.4mb), Playback (7.5mb), Get WebEx Player, YouTube
The AnyBody Research Project has developed a detailed model of a seated human in cooperation with the furniture industry. This model is available in the public domain repository. The model allows us to investigate the classical discussions in seating ergonomics: Seat inclination, fabric friction, lumbar support, backrest height, etc. This webcast presents the model and reviews some of the more interesting results.

Validation of musculoskeletal models (Dr. Mark de Zee, 4. October, 2006)
Presentation (1.4mb), Playback (8.2mb), Get WebEx Player, YouTube
Musculoskeletal simulation predicts muscle forces, and muscle forces are (almost) impossible to measure directly. So how to validate models? This webcast introduces a couple of workarounds that will allow you to verify the accuracy of your models.

How to synthesize posture and movement with inverse dynamics (Dr. John Rasmussen, 25. September, 2006)
Presentation (0.4mb), Playback (10mb), Get WebEx Player
It is a popular misconception that posture and movement prediction can only be done with forward dynamics. In this webcast we show that inverse dynamics is so computationally efficient that an optimization algorithm can be wrapped around it and unknown postures and movements can be predicted based on performance criteria.

Gait Modeling (Dr. John Rasmussen, 31. August, 2006)
Presentation (1.8mb), Playback (8mb), Get WebEx Player
Gait analysis is one of the most important and well-established clinical applications of biomechanics. With a musculoskeletal model you can look under the skin of the patient and obtains estimates of joint and muscle forces. The questions are: how is it done, and to which extent can we rely on the results? This webcast will attempt to answer those questions.

Kinematics (Dr. John Rasmussen, 14. June, 2006)
Presentation (0.5mb), Get WebEx Player
This webcast explains some of the more advanced kinematics features in AnyBody.

The AnyBody Modeling System: News in Version 2 (Dr. John Rasmussen, 18. May, 2006)
Presentation (0.3mb), Playback (15mb), Get WebEx Player
This webcast highlights the new facilities in version 2 of The AnyBody Modeling System. The major news of version 6 of the AnyScript Model Repository is also covered.

Anthropometric Scaling of Musculoskeletal Models (Dr. John Rasmussen, 9. May, 2006)
Presentation (0.6mb), Playback (16mb), Get WebEx Player
This webcast explains in detail and with a live demonstration the various options available for body model scaling in AnyBody.

The AnyBody Model Repository (Dr. Soeren Toerholm Christensen, 4. April, 2006)
Presentation (4mb), Playback (15mb), Get WebEx Player
This webcast gives an overview of the AnyScript Model Repository version 6. It explains the structure of the models, the available body parts, and the different sample applications. Furthermore, examples of friction modeling, conditional contact, and anthropometric scaling are briefly presented.

Muscle Modeling (Dr. John Rasmussen, 6. March, 2006)
Presentation (3mb), Playback (17mb), Get WebEx Player, YouTube
This webcast presents the different muscles models available in the AnyBody modeling system. This includes Hill-type strength models. Furthermore, the muscle wrapping model (for bony surfaces) is briefly presented, and finally, the muscle recruitment optimization problem is discussed. (The webcast is available for playback.)























































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