The thumb is subjected to high loads during a lifetime. The pivotal point is the thumb saddle joint.
It hides itself in the thumb ball and allows the rotation of the entire thumb and the opposing of the thumb to the other fingers (so-called opposition). An arthritis of this joint is called rhizarthrosis and is relatively frequent: 10% of women over 50 years are affected, in men, this type of osteoarthritis is less frequent.
“I can not open a bottle.
Objects suddenly fall from my hand.
Sometimes I have pain in the back of my head or at night.”
By a simple X-ray examination in 2 planes. This shows a narrowing of the joint gap, possibly also emigration of the thumb from the saddle joint, sometimes cystic changes in the interior of the bone.
The passive movement of the joint creates pain and provides important information about the sliding behavior of the thumb saddle joint.
The joint gap between the large polygon and the base of the first metatarsal is no longer present. The contact surfaces of these two bones form the thumb saddle joint. Here bones rub bone.
The bony extensions on the large polygon are also known as osteophytes and represent a further cause of pain, as these attachments can rub against the neighbors and continue to interfere with the function of the thumb. The joint wear can additionally lead to the development of cavities in the joint-proximal sections of the bones, so-called cysts.
The abrasion of the joint surfaces leads to instability of the joint and to emigration of the medial bone from the thumb saddle joint. An expansion of the joint develops (so-called dislocation or in the initial stage subluxation)
At the beginning of the disease there is the possibility of non-operative therapy: …Arthrosis of The Thumbar Joint – Rhizarthrosis Read More