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An MR-Compatible Device for Imaging the Lower Extremity During Movement and Under Load Team Leader: Sarajane Stevens Communicator: Arinne Lyman BSAC: Christopher Westphal BWIG: Eric Bader Client: Professor Darryl Thelen Advisor: Professor William Murphy Overview • Problem Statement • Motivation • Background – Muscle Anatomy/Injury – Current Devices • Design Constraints • Designs – – – – Accessories Prone On Side Loading System • Future Work • References Problem Statement Most current imaging techniques used to visualize knee kinematics are static and don’t provide direct measurements of biomechanical function. These applications require the use of a non-magnetic device for loading or guiding the limb through a desired, repeatable movement. Our initial intended application is to use Cine-PC (Phase contrast) imaging to measure in-vivo musculotendon motion of the hamstrings muscles during a stretch-shortening cycle. Cine-PC requires multiple cycles of motion, necessitating that the device guide the limb through a repeatable motion at relatively low loads. Muscle Anatomy/Injury • 3 separate muscles • Pulled hamstring -Eccentric contraction • Scar tissue formation • Affects muscle performance Motivation • Measure velocity of muscle fibers around scar tissue • Prevent re-injury • Tailor rehabilitation programs Summary of Current Devices 12 different devices in literature •Subjects lay supine/prone in device •Between 0-90 degrees flexion •Weight attached to pulley •Cons • lateral motion not restricted • non-physiological load • patient fatigue • non-periodic motion Design Constraints • • • • • • Provide repeatable, harmonic motion Same start/end points – bore size Generate physiological load on hamstring Simulate swing phase of running Support thigh – limit movement Non-metallic, non-ferrous materials Design Components Designs – Thigh Restraint • Stabilizes thigh for maximum resolution • Prevents unwanted movement • Must accommodate RF coil Designs - Boot • Angled for maximum knee extension • Restricts movement and supports ankle • Provides attachment point to system Design - Prone • Shank moves up and down • Must counteract weight of shank • Greater range of motion Design – Lateral • Upper leg supported by table • Lower shank moves back and forth • No effects of gravity • Restricts lateral motion k Loading System -Spring Loading System - Dampener c I Loading System - Inertial Inertial Systems Future Work • • • • • Determine loading system Finalize design Obtain materials Build prototype Test prototype References 1. 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