SEQUESTERUM
Definition : It is a separated microscopic/macroscopic necrotic fragment of usually a cortical bone which seems to be radiodense, surrounded by infected granulation tissue and pus (radiolucent) from the viable parent bone
Diagnostic importance : Its presence is necessary to make a diagnosis of chronic osteomyelitis
Biological importance : It serves as a focus for continuing infection leading to recurrent bouts of acute and chronic Osteomyelitis
Classification of Sequesterum :
According to shape :
Pencil – Infants
Cylindrical/tubular – Infants
Ring – External fixator
Conical – Amputation stump
Annular – Amputation stump
Coralliform – Perthes’ disease
According to consistency :
Coke like – Tuberculosis
Feathery – Syphilis
Sand like – TB osteomyelitis in metaphysis
According to Color :
Black – Amputation stump , Fungal osteomyelitis
Green – Pseudomonal Osteomyelitis
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