Wrist Kinematics - Wrist Kinematics Range of Motion o o...

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Wrist Kinematics Range of Motion o flexion from the anatomical position = 85-90 ° o extension from the anatomical position = 75-80 ° these figures can vary widely o of this: 60% of flexion occurs at the midcarpal joint 40% of flexion occurs at the radiocarpal joint 33% of extension occurs at the midcarpal joint 67% of extension occurs at the radiocarpal joint Range of Motion o radial flexion from the anatomical position = 15-20 ° o ulnar flexion from the anatomical position = 35-37 ° Generally, loss of wrist mobility does not seriously impede performance of activities of daily living. Wrist Stability Wrist is inherently stable because of the double hinge system o this is a bimuscular, biarticular chain subject to ZIG-ZAG collapse when under a compressive load There is no dynamic stability because no muscles attach to carpal bones Stability comes from two sources: 1. intricate ligamentous constraint 2. precise opposition of multifaceted articular surfaces
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Wrist Kinematics - Wrist Kinematics Range of Motion o o...

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