Osteokinematics and Arthrokinematics of Putting in Contacts

 Biomechanics Blog 1: Contacts Breakdown 

The action I chose was a task that I participate in every morning, and it is putting in my contacts. The joint for this action is at the elbow joint. The start of the action begins with my arm in approximately 90 degrees of flexion to put my contacts onto my finger. My elbow then goes into full flexion as it nears my eye. The osteokinematics of this daily task will be an open chain because my arm is going from a neutral flexed position to a fully flexed position. The arthrokinematics of this action is described as the moving part being the concave ulna rolling and gliding anteriorly with the convex, fixed humerus. The prime mover of this forearm flexion action will be my biceps brachii and it will shorten the muscle meaning that it is demonstrating a concentric action.