Osteonecrosis of the lunate

1. What is another name of osteonecrosis of the lunate?
2. What is osteonecrosis of the lunate? What are predisposing factors?
3. What is seen clinically?
4. What imaging is used for diagnosis?
5. What is the treatment?

Answers:
1. Klenbock's disease.
2. Idiopathic loss of blood supply to lunate, causing necrosis of the bone and degenerative changes. Etiology is likely repetitive trauma or possibly short ulna.
3. Ulnar sided pain and swelling over dorsal wrist, reduced grip strength.
4. Plain films may show fracture/flattening/sclerosis of lunate, bone scan, MRI.
5. Ortho referral.