Femoral bone infarct

Bone infarction is a term used to refer to osteonecrosis within the metaphysis or diaphysis of a bone.

Causes of osteonecrosis include trauma, haemoglobinopathies, radiotherapy, corticosteroid exces.
CT does not reveal much more than the plain film.
serpiginous peripheral low signal due to granulation tissue and to lesser extent sclerosis
peripheral rim may enhance post gadolinium
central signal usually that of marrow
acute infarct may show ill-defined non-specific area of high signal
double-line sign: hyperintense inner ring of granulation tissue and a hypointense outer ring of sclerosis
absence of double-line sign does not exclude bone infarct
central signal usually that of marrow

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