Citation, DOI, disclosures and article data
At the time the article was created Bruno Di Muzio had no recorded disclosures.View Bruno Di Muzio's current disclosures
At the time the article was last revised Ian Bickle had the following disclosures:
- 4ways diagostics, I work for this out sourcing company during non NHS hours (ongoing)
These were assessed during peer review and were determined to not be relevant to the changes that were made.View Ian Bickle's current disclosures
Sequestrated disc, also referred to as a free disc fragment, corresponds to extruded disc material that has no continuity with the parent disc and is displaced away from the site of extrusion. By definition, it corresponds to a subtype of disc extrusion.
The term "migrated" disc refers only to position and not to the continuity of disc substance. So, this term can be used when referring either to extruded discs that still have continuity or those without, i.e. sequestrated (e.g. disc extrusion migrated caudally, sequestrated disc migrated cranially).
History and etymology
The English word 'sequester' is uncommonly used in everyday speech but means to 'set apart' or 'set aside' 2. It is of course also used in the sense of a piece of dead bone set apart from the rest of the bone, i.e. a bony sequestrum, most commonly in chronic osteomyelitis 3.