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Insights into Imaging
Fig. 16 | Insights into Imaging

Fig. 16

From: Subchondral insufficiency fractures, subchondral insufficiency fractures with osteonecrosis, and other apparently spontaneous subchondral bone lesions of the knee—pathogenesis and diagnosis at imaging

Fig. 16

Subchondral insufficiency fracture complicated with osteonecrosis (SIF-ON) and early subchondral collapse. a T2-weighted MR image shows a wide subchondral low signal intensity area (arrow). On T1-weighted images without (b) and after contrast injection (c) a large portion of this area does not enhance after intravenous contrast injection (arrows in c). Note also a thin line with high fluid-like signal intensity in dissected subchondral fracture on T2-weighted image (arrowhead in a)

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