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Insights into Imaging
Fig. 18 | Insights into Imaging

Fig. 18

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. 18

Early subchondral insufficiency fracture with osteonecrosis (SIF-ON) and collapse. a T1-weighted MR image shows an area of low signal intensity in the inferior pole of the medial condyle (arrow). b T2-weighted image (b) shows an immediate subchondral low signal intensity area longer than 14 mm (arrowheads), suggestive of early SIF-ON. Note also several fissure lines away from the surface (arrow), which is also a risk factor for an evolution towards a SIF-ON. c A few years later, a radiograph shows an irregular collapsed articular surface, confirming the initial suspicion of SIF-ON

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