Biomechanics Blog Post #1

Drinking plenty of water is part of my daily routine. The starting position is with my arm straight with my elbow extended and ending with elbow flexion to bring the cup to my mouth. For the elbow joint, the plane of motion is sagittal plane and the axis of rotation is frontal axis. For the shoulder joint, the plane of motion is the sagittal plane and the axis of rotation is the frontal axis. For the elbow joint, the osteokinematic movement is flexion. When I bring the glass of water to my mouth, I have to flex at the elbow joint to do so. The angle between my humerus and radius decreases. The arthrokinematic movement at the elbow joint is rolling and gliding. The more stable humerus rolls and glides on the less stable ulna in the same direction to produce the movement. The prime movers to bring a glass of water to my mouth are the biceps brachii, brachioradialis, and brachialis. These three muscles produce a concentric contraction in order to flex the elbow joint.

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