What is Kienbocks disease?
Kienböck’s disease is due to osteonecrosis of the lunate bone and is a cause of ulnar-sided wrist pain. Radiographs often show collapse of the lunate in advanced cases. The ulna is generally shorter than the radius (negative ulnar variance) with this disorder. The role of MRI in patients suspected of having this disorder is the detection of osteonecrosis in early cases in which radiographic findings are normal. Osteonecrosis of the lunate bone is seen as diffuse or heterogeneous low signal intensity on T1-weighted images and as diffuse or heterogeneous high signal intensity on T2-weighted images