The Case Against Transient Osteoporosis: Why It May Be a Subchondral Fracture

A new educational lecture argues that ‘transient osteoporosis of the hip’ is a misnomer; modern MRI reveals these cases are actually subchondral insufficiency fractures invisible on older scanners.

• Lecture reviews history of bone marrow edema syndrome and avascular necrosis, proposing that TOH is an occult subchondral insufficiency fracture (SIF).
• Improved MRI resolution now frequently shows fracture lines not seen on earlier imaging, challenging the transient osteoporosis diagnosis.
• Perspective is based on expert opinion and retrospective imaging analysis; no prospective validation was reported.

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