FIGURE 2. Patient of Figure 1 underwent follow-up MRI, bone scintigraphy, and SPECT. T1- and T2-weighted MR images (A) show geographic areas of low signal intensity in both femoral heads, and bone scintigraphy (B) and SPECT (C) show increased uptake surrounding cold central areas in both femoral heads. Osteonecrosis of both femoral heads was pathologically confirmed after total hip replacement.

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