The elbow
For my joint i got assigned the elbow. The elbow is the region surrounding the the elbow joint. Three bones form the the elbow joint which link the upper arm with the radius and ulnar bones of the forearm.
Two main movements are possible with the elbow, the hinge like bending and straightening(flexion and extension) between the humerus and ulna and the complex action of turning the forearm over (pronation), this happens at the articulation between the radius and the ulna. The hinge only moves in one plane. I represented this in my model by making three different acrylic pieces. One to represent the plane that cannot move and also represents the limits of the elbow joint movement. The second is the elbow joint itself, I tried to best manipulate the acrylic with a heat gun to shape it into my best representation of the elbow joint and how it looks. The third is representive of the ulna and radius bones, by attaching them with elastic and thread to the elbow joint and plane it can twist in a motion like that of the turning of the forearm, more colloquially referred to as double jointed. As the models shows these movements are limited just like the joint limitations themselves caused by the ligaments and tendons as well as the shape of the bones.. I used acrylic because i thought it was the best material to use to create a form from my ideas and with the ability of being able to melt it to change its shape and form it worked really well. The elastic and thread also represent the tendons and ligaments within the elbow joint.
Technical drawing
My technical drawing of the elbow. Using the hinge motion of the joint as well as the twisting, double jointed motion. Also darkened lines represent where the limit and more important aspects of the joint.
Pysical model photos
These are my Pysical models, made with acrylic, clear elastic and thread. Representing the elbow joints movements .
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