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Wrist Biomechanics-1

Wrist Biomechanics-1 - MUN Wrist Biomechanics and Carpal...

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Unformatted text preview: MUN Wrist Biomechanics and Carpal Instability MUN Wrist Biomechanics • Anatomy • Kinematics • Force transmission MUN Anatomy • 8 bones • Complex interlocking shapes • Intrinsic and extrinsic ligaments MUN MUN Wrist ligaments MUN Wrist ligaments • Volar stronger than dorsal • Double V shape with weak area ; space of Poirier • Important interosseous ligaments are SLIL and LTIL • Dorsal ligaments tend to converge on triquetrum MUN Kinematics • Three axes of motion – FEM 90 – 70 degrees – Flex/ext split between radiocarpal & midcarpal – RUD 20 – 50 degrees – PSM 90 – 90 degrees MUN Axes of Motion MUN Kinematics • Rows • Columns (Navarro) • Oval ring • Longitudinal columns (Weber) • “Link Joint” MUN Link Joint MUN Kinematics • Rows – Proximal and Distal with scaphoid as a bridge – Motion within and between rows • Columns – Central(flex/ext) lunate,capitate,hamate – Lateral (mobile) scaphoid,trapezoid,trapezium – Medial (rotation) triquetrum MUN MUN Kinematics • Center of rotation : head of capitate MUN...
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Wrist Biomechanics-1 - MUN Wrist Biomechanics and Carpal...

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