Kienbock Disease: Causes, Symptoms, and Treatments. Kienböck's disease, a rare condition involving the avascular necrosis of the lunate bone in the wrist. They explain that this occurs when the lunate, a small carpal bone vital for wrist movement, loses its blood supply, leading to bone death, collapse, and potentially arthritis. The texts consistently highlight that it most commonly affects males aged 20-40and is often linked to skeletal variations (like a shorter ulna), trauma, and certain underlying medical conditions. Diagnosis primarily relies on imaging techniques, particularly MRI for early detection, with treatment strategies varying based on the disease's stage, ranging  ...