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Insights into Imaging
Fig. 9 | Insights into Imaging

Fig. 9

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. 9

Evolution of an early subchondral insufficiency fracture with osteonecrosis. a Initial radiograph shows a slight hyperostosis near a discrete depression of the lower pole of the condyle (arrow). b Additional radiograph tangent to the posteroinferior pole of the condyle and performed with traction on the leg shows a typical subchondral bone dissection (arrow). c Three months later, this necrotic area shows a focal collapse (arrows), already complicated by a complete narrowing of the adjacent joint space (arrowhead)

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