In another type of systemic scleroderma, known as diffuse cutaneous systemic scleroderma, the fibrosis affects large areas of skin, including the torso and the upper arms and legs, and often involves internal organs.n the third type of systemic scleroderma, called systemic sclerosis sine scleroderma (sine means without in Latin), fibrosis affects one or more internal organs but not the skin.
The UCL, or ulnar collateral. ligament, is located in. the middle thumb joint, and provides support to. the thumb during grip. and pinch. It is the most. common ligament injury.
The arm consists of three large bones. The humerus bone forms the upper arm. The radius and ulna are the two bones forming the lower arm. You have one radius and one ulna in each arm. The radius and ulna bones connect between the elbow joint and the wrist. One easy way to remember which bone is the radius, and which is the ulna, is that the radius connects to the thumb side of the wrist. Keep reading to learn more about the radius and ulna, and how your lower arm works. On this page: