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Osteomyelitis (or OM) is infection and inflammation of the bone or bone marrow.〔Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; & Mitchell, Richard N. (2007). ''Robbins Basic Pathology'' (8th ed.). Saunders Elsevier. pp. 810–811 ISBN 978-1-4160-2973-1〕 It can be usefully subclassified on the basis of the causative organism (pyogenic bacteria or mycobacteria) and the route, duration and anatomic location of the infection. ==Classification== The definition of OM is broad, and encompasses a wide variety of conditions. Traditionally, the length of time the infection has been present and whether there is suppuration (pus formation) or sclerosis (increased density of bone) is used to arbitrarily classify OM. Chronic OM is often defined as OM that has been present for more than one month. In reality, there are no distinct subtypes, instead there is a spectrum of pathologic features that reflect balance between the type and severity of the cause of the inflammation, the immune system and local and systemic predisposing factors. *Suppurative osteomyelitis * *Acute suppurative osteomyelitis * *Chronic suppurative osteomyelitis * * *Primary (no preceding phase) * * *Secondary (follows an acute phase) *Non-suppurative osteomyelitis * *Diffuse sclerosing * *Focal sclerosing (condensing osteitis) * *Proliferative periostitis (periostitis ossificans, Garré's sclerosing osteomyelitis) * *Osteoradionecrosis OM can also be typed according to the area of the skeleton in which it is present. For example, osteomyelitis of the jaws is different in several respects from osteomyelitis present in a long bone. Vertebral osteomyelitis is another possible presentation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Osteomyelitis」の詳細全文を読む スポンサード リンク
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