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. 2023 Oct 2;14:164. doi: 10.1186/s13244-023-01495-6

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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)