A variety of classification systems exist for the classification of osteomyelitis, some of which are inconsistent with each other.
Zurich classification:
Osteomyelitis acute (17%) → 4 weeks → secondary chronic (70%). |
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Osteomyelitis primary chronic (10 %) |
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Historically evolved designations
Diffuse sclerosing osteomyelitis (DSO) – course without acute stage, hence classification as and synonym for primary chronic osteomyelitis
Florid osseous dysplasia (FOD) – bone pathology in the form of sclerosis (proliferation of connective tissue) mostly only of the alveolar processes; thus to be considered a local risk factor rather than a form of osteomyelitis
Juvenile chronic osteomyelitis (synonym: Garrés osteomyelitis) – classified by some authors as an early-onset form of primary chronic osteomyelitis.