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Spontaneous Osteonecrosis of the Knee.

Imaging Four view radiographs (anterior-posterior, tunnel view, sunrise, and lateral) should be obtained. There will be flattening of the respective condyle and/or radiolucencies if SONK is in the late stages; otherwise, radiographs will be normal in the early stages. Magnetic resonance imaging (MRI) is the imaging modality of choice if SONK is suspected (Fig. 1) (9). Bone scans also may show SONK (Fig. 2) but are not as sensitive as MRI (7).