通常没有骨膜反应，除非伴有自发性骨折。
A periosteal reaction is notably absent unless there is an associated pathologic fracture.
命名：既往曾称为膝关节自发性骨坏死，但这一命名不能反映技能不全性骨折的发病机理。
Nomenclature: Spontaneous osteonecrosis of the knee (SONK) was previously used synonymously, but term is considered misnomer given underlying etiopathogenesis corresponds to insufficiency fracture.
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