1. x rays. 2. blood investigaton ESR, CRP 3. SINOGRAM-- to llocalise sequestrum
4. m/m-- 1. put methylene blue 1 day before to follow sinus tract.
5. sequestromy if involucrum has formed.if you think that after sequestromy bone will become unstable than wait till more involucrum forms.
6. ring sequestrum seen at amputed stumps.
7.TB-- Very little periosteal reaction. feathery sequestrum
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