Biomechanics blog 1

Every morning and every night I wash my face. I apply the face wash to my fingers and rub it in. During this phase my arms are flexed at 90 degrees. When I am ready to apply the face wash to my face, my elbows are in full flexion and my wrists begin abducting and adducting. Flexion of the elbow occurs in the sagittal plane acting on the frontal axis and the abduction and adduction of the wrist occurs in the frontal plane acting on the sagittal axis. The prime mover of the elbow is the biceps brachii that causes the concentric contraction during this action. When referring to the arthrokinematics of the elbow joint, the convex distal end of the humerus articulates with the concave proximal end of the ulna. As a result, the ulna glides on the humerus anteriorly. On the other hand, the osteokinematics of the elbow goes from mid-position of elbow flexion to full flexion in an open kinematic chain.