At some point during each day, I talk to a friend or family member on the phone. Normally, I start this action with my arm by my side. I then reach for my phone. Lastly, I bring my phone up to my ear.
My starting position involves my arm extended by my side. My end position would be with my shoulder flexed, elbow flexed, and wrist radial deviated with my phone by my ear.
When I reach for my phone, it is normally on the table to the side of me or in front of me. When I reach for it out to the side, my shoulder is moving in the the frontal plane on a sagittal axis (abduction). When my phone is in front of me, my shoulder is moving in the sagittal plane on a frontal axis. When bringing the phone up to my ear, my shoulder and elbow are moving in the sagittal plane on a frontal axis.
The osteokinematics of this aspect of my daily routine consist of many: elbow flexion and elbow extension in an open kinetic chain are just a few.
In elbow flexion, the humerus is the convex surface and the ulna is the concave surface. There are two joints involved in flexion of the elbow: the humeroulnar joint and the humeroradial joint. The proximal end of the ulna glides on the distal end of the humerus anteriorly. The proximal end of the radius also glides on the distal end of the humerus anteriorly.
In elbow extension, the humerus is the convex surface and the ulna is the concave surface. There are two joints involved in extension of the elbow: the humeroulnar joint and the
humeroradial joint. The proximal end of the ulna glides on the distal end of the humerus posteriorly. The proximal end of the radius also glides on the distal end of the humerus posteriorly.
The prime movers for elbow flexion are the biceps brachii, brachialis, and brachioradialis. The activations for these movers is concentric.
The prime mover for elbow extension is the triceps brachii. The activation for this mover is eccentric.
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