UF_Lecture_1_Intro - EML 5595 Mechanics of Human Locomotor...

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Unformatted text preview: EML 5595 Mechanics of Human Locomotor System Fall 2010 Instructor: Prof. B.J. Fregly TA: Jonathan Walter (volunteer) Outline Motivation Course Overview Syllabus Questions Motivation 1. What real-life functional disorders can we realaddress with the material in this course? 2. Why h ld 2 Wh should we d develop musculoskeletal models l l k l t l d l and simulations to address these issues? Motivation "Imagine a world where orthopedic surgeries and rehabilitation "I i ld h th di i d h bilit ti procedures are custom tailored to the patient, similar to how suits can be custom tailored to the business executive. Rather than basing treatment decisions on general clinical observations or simple anatomic measurements, clinicians use patientpatient-specific computer models that can predict postposttreatment function. These models are created from prepretreatment movement and imaging data and utilize state-of-thestate-of-theart simulation technologies. By performing numerous virtual treatments, clinicians personalize the relevant surgical or p g rehabilitation parameters so as to optimize functional outcome on an individual patient basis. The end result is millions of patients whose quality of life is greatly improved through these technologies." Course Overview L t Lectures b professor by f Journal article reviews by students Si l ti llabs Simulation b Clinical application paper Course project Why Reviews by Students? Learning Method What one reads What one hears What one sees What one sees and hears What one speaks Retention 10% 26% 30% 50% 70% J. E. Stice (1987) Engineering Education, pp. 291-296 291- Preliminaries This is the third time this course is being taught and the first time using OpenSim. We may OpenSim. need t make some adjustments along th d to k dj t t l the way. Please give feedback. Labs, paper, and p j p p project will be more open p ended/researchended/research-like than normal classes. You will need to dig beyond lecture and lab notes to complete the assignments. This class assignments will require significant effort. Be interactive! Contribute! Have fun! Acknowledgments Significant portions of the lecture slides and Si ifi t ti f th l t lid d simulation labs were taken from a similar course developed by Dr. Scott Delp and colleagues at Stanford University. Similar courses based on the same materials have been taught at the University of Texas at Austin, the University of Wisconsin, and Wake Forest University/Virginia Tech. Many of the materials for this course are the result of the combined development efforts of professors at these institutions institutions. Movement Production External Forces and Moments Neural Command Multijont Dynamics Musculotendon Dynamics 1 , 2 F1 F2 Musculoskeletal Geometry y (moment arms) T1 T2 Eqns 1 of 2 Motion M ti 1 2 1 2 Sensory y Organs Simulation Software OpenSim (https://simtk org/home/opensim): https://simtk.org/home/opensim): ): Provides model building capabilities via xml files Defines muscle-tendon models, muscle moment musclearms, and skeletal model structure , Performs "standard" biomechanical analyses such as inverse kinematics, inverse dynamics, static optimization, and dynamic optimization Lab 1: Dynamic Simulation of y Jumping* External Forces and Moments Neural Command 1 , 2 Musculotendon Dynamics F1 F2 Musculoskeletal Geometry (moment arms) T1 T2 Eqns 1 of 2 Motion M ti 1 2 1 2 *Unlike the other simulation labs, this lab does not use OpenSim but rather uses a self-contained Matlab program. self- Lab 1: Dynamic Simulation of y Jumping Objectives: Determine joint torque controls and initial joint angles to maximize jump height Evaluate sensitivity of simulations to changes i controls and i iti l conditions h in t l d initial diti Study influence of muscles on the motion of unspanned j p joints Compare simulation predictions to experimental jump height Lab 2: Muscle Tug of War External Forces and Moments Neural Command 1 , 2 Musculotendon Dynamics F1 F2 Musculoskeletal Geometry (moment arms) T1 T2 Eqns 1 of 2 Motion M ti 1 2 1 2 Lab 2: Muscle Tug of War Objectives: Generate differential equations that describe muscle dynamics Use OpenSim models to simulate dynamics Analyze the effects of model parameters on actuator performance Lab 3: Muscle-Driven MuscleSimulation of Kicking External Forces and Momens Neural Command 1 , 2 Musculotendon Dynamics F1 F2 Musculoskeletal Geometry (moment arms) T1 T2 Eqns 1 of 2 Motion M ti 1 2 1 2 Lab 3: Muscle-Driven MuscleSimulation of Kicking Objectives: Use OpenSim's dynamics engine to generate equations of motion Prescribe muscle excitations to generate coordinated movement Study effects of abnormal control Lab 4: Muscle-Driven MuscleSimulation of Pedaling External Forces and Momens Neural Command 1 , 2 Musculotendon Dynamics F1 F2 Musculoskeletal Geometry (moment arms) T1 T2 Eqns 1 of 2 Motion M ti 1 2 1 2 Lab 4: Muscle-Driven MuscleSimulation of Pedaling Objectives: Design muscle stimulation patterns to enable a paralyzed individual to pedal a stationary bicycle Perform dynamic simulations of movement Consider how modeling can be used in the design of assistive devices for the disabled Clinical Application Paper G l is to improve understanding h musculoskeletall Goal i t i d t di how l k l t models could be useful for clinical applications. Identify one clinical problem of interest where musculoskeletal models could h l i l k l t l d l ld help improve t t treatment. t Identify an associated "clinically useful locomotion measure" from the literature. Assess the current modeling state-of-the-art from the state-of-theliterature. Discuss the major modeling and simulation challenges that must be overcome to make this clinical application scenario into reality. Three pages maximum length length. Course Project Each student will develop a course project that performs a broad range of modeling and simulation tasks. Ch i of "d f lt" project ( Choice f "default" j t (soccer ki ki ) or your kicking) own project idea with approval of instructor. Possible alternate ideas include stroke deficit analysis, paraplegic rehabilitation, cerebral palsy surgery simulation, high tibial osteotomy surgery simulation, or exercise in space simulation. If you choose your own project, outside research will be required to identify a tractable problem of interest, so start early! interest early! Syllabus The syllabus is the contract between me and you. It lays out all important logistics related to this course. Make sure to read it carefully! f Questions Questions are one the best ways to learn. The only dumb question in this class is the one you do not ask. Q Questions??? ??? For Next Time Visit the course web site http://www.mae.ufl.edu/~fregly/eml5595.htm http://www.mae.ufl.edu/~fregly/eml5595.htm and familiarize yourself with the resources available for download Download and install OpenSim 2.10 b6 (www.simtk.org) www.simtk.org) Download and start working through OpenSim Tutorial 1 (www simtk org) www.simtk.org) www.simtk.org org) Download and read Delp et al. (2007) IEEE (2007) Trans Biomed Eng 54(11):1940-50 54(11):19401940 ...
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This note was uploaded on 02/15/2012 for the course EML 5595 taught by Professor Staff during the Spring '08 term at University of Florida.

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