Biomechanics Blog #1

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Every morning when I wake up I drink a cup of coffee. When I pick up the mug my wrist and elbow are in a flexed position and my shoulder is also in flexion. When I put the mug back on the counter my wrist and elbow are in extension, while my shoulder is still in flexion. The motions of flexion and extension of the wrist and elbow occur in the sagittal plane around the frontal axis. The osteokinematics of the elbow are in an open-kinematic chain. In terms of arthrokinematics, the moving ulna is the concave segment and it will roll anteriorly and glide anteriorly on the stable convex humerus. The prime mover of the elbow during flexion is the biceps brachii.




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