Question: What is (are) Kienbock's disease ?
Answer: Kienbock's disease is a condition characterized by interruption of blood supply to one of the small bones of the hand near the wrist (the lunate). If blood supply to a bone stops, the bone can die; this is known as osteonecrosis. Affected people may first think they have a sprained wrist and may have experienced trauma to the wrist, which can disrupt the blood flow to the lunate. As the disease progresses, signs and symptoms may include a painful and/or swollen wrist; stiffness; decreased grip strength; tenderness directly over the bone; and pain or difficulty in turning the hand upward. The underlying cause of Kienbock's disease is unknown. Treatment aims to relieve the pressure on the bone and restore blood flow within the bone. Surgery may be recommended.
Source: GARD