KNUTTSON 'S SIGN
- Knuttson's sign (vaccum phenomenon ) is characteristic of degenerative disc disease. It refers to radiolucent defect indicationg the presence of nitrogen gas accumulations in annular and nuclear degenerative fissures of intervertebral disc.
- Othere features of degenerative joint spaces are
2.osteophytes
3.Schmorl's node
4.subchondral sclerosis
5.subchondral cyst
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