Ring sequestrum causes:
Typhoid osteomyelitis
Chronic osteomyelitis
Amputation stump
Tuberculosis osteomyelitis
Sequestrum is the dead bone separated out from the living bone by the granulation tissue. The factors responsible for bone death in chronic osteomyelitis are: raised intravascular pressure Vascular stasis and small vessel thrombosis periosteal stripping bacterial toxins Sequestrum is the hall mark of chronic osteomyelitis Ring sequestrum causes : Ring sequestrum * Amputation stump * Pin tract infection Cylindrical/pencil like Infants Green Pseudomonas osteomyelitis Black Amputation stump due to exposure of bone with air.
Joint and Soft tissue infections