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Motion Preservation Projects Wayne Cheng, MD Head of Spine Service Associate Professor, Department of Orthopedic Surgery Loma Linda University Medical Center UCR meeting - Aug 23, 2009 Wayne Cheng, MD Head of Spine Service Associate Professor, Department of Orthopedic Surgery Loma Linda University Medical Center UCR meeting - Aug 23, 2009
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HISTORY
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Posterior Approach - Fusion Disease?
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Spinal Biomechanics Each vertebral body interacts with an adjacent vertebra by means of 5 articulating joints – disc and 4 facets Biomechanics of a functional spine unit (FSU or motion segment) are determined by interaction of the disc, facets and ligaments FSU’ have 3 main roles: stabilize the vertebra relative to each other protect the nerves and each other from excessive loads provide proper function for each FSU, the spine, and ambulation of the body as a whole transfer and share loads in the spinal column. Each vertebral body interacts with an adjacent vertebra by means of 5 articulating joints – disc and 4 facets Biomechanics of a functional spine unit (FSU or motion segment) are determined by interaction of the disc, facets and ligaments FSU’ have 3 main roles: stabilize the vertebra relative to each other protect the nerves and each other from excessive loads provide proper function for each FSU, the spine, and ambulation of the body as a whole transfer and share loads in the spinal column. White and Panjabi Clinical Biomechanics of the Spine, 2nd Ed., 1990, J.B. Lippincot Philadelphia
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TOTAL DISC REPLACEMNT Charite’ (depuy)Prodisc (synthes) Maverick (Medtronic) Flexicore (stryker)
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Total Facet Arthroplasty System
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POSTERIOR DYNAMIC STABILIATION
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How much motion?
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Questions How stable? Replace all joints +
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Questions How stable? TDR + posterior dynamic stabilization +
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Question: TDR Lateral approach
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Equipments
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Thank You
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