classification
Chondromalacia - MRI grading by modified Noyes System
The modified Noyes system was published in 2009. It is a modification of the Noyes grading system for the purpose of MRI grading. The original Noyes grading system was based on arthroscopic findings.
| Grade | Description |
|---|---|
| Grade 0 | normal cartilage |
| Grade 1 | increased T2 signal intensity of morphologically normal cartilage not oriented at 55° to the external magnetic field |
| Grade 2A |
Chondromalacia - MRI grading by modified Outerbridge System
The modified Outerbridge system was published in 2006. It differs from the Outerbridge system in grade I only, the definition of which was adjusted to reflect changes on MRI, because the original system was based on arthroscopic findings.
| Grade | Description |
|---|---|
| Grade 0 | normal cartilage |
| Grade 1 | signal intensity alterations with an intact surface of the articular cartilage compared with the surrounding normal cartilage |
Bosniak classification of renal cysts
Bosniak classification of renal cystic masses has five cathegories. It was devised by Dr. Morton A. Bosniak to separate lesions that require surgery (Bosniak III and IV) from those that can be safely followed-up or left alone.
| Category | Description |
|---|---|
| Bosniak I | Benign simple cyst with thin wall without septa, calcifications, or solid components. It does not enhance with contrast, and has a density equal to that of water. |
| Bosniak II |
Lichtman's radiographic classification of aseptic necrosis of lunate bone Kienbock's disease
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 |
