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Insights into Imaging
Fig. 7 | Insights into Imaging

Fig. 7

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. 7

Early-stage subchondral insufficiency fracture (SIF). a Radiograph shows no significant finding apart from very subtle flattening of the condylar surface (arrowhead). b T1-weighted MR image shows moderate low signal intensity within the condyle (asterisk). c Fat-suppressed T2-weighted image shows BME-like high signal intensity more intense near the articular surface and extending to a part of the condyle without clear limits (asterisk). Note that the thin fracture line with low signal intensity is poorly visible with T1-weighting, and that with T2-weighting, high signal intensity extends within the area between the fracture and the articular surface (arrowheads). The high signal intensity in this area of the subchondral bone is an important finding to differentiate a SIF from a SIF-ON

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