| T | Primary tumor |
|---|---|
| Tx | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| Tis | Carcinoma in situ: invasion up to lamina propria mucosae |
| T1 | Tumor invades submucosa |
| T2 |
Kienbock's disease is an eponym for avascular necrosis of the lunate bone. It usually affects man working manually with tools like pneumatic hammer that cause repetitive trauma.
| Stage | Description |
|---|---|
| Stage I | normal x-ray |
| Stage II | sclerosis of lunate with possible decrease of lunate height on radial side only |
| Stage IIIa | lunate collapse, no scaphoid rotation |
| Stage IIIb |