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Necrotic areas of the femoral heads in the 4 cases studied have been overlayed with transparent gray masks to show their extent: case 1 (panel A), case 2 (panel B), case 3 (panel C), and case 4 (panel D).Table 1. Summary of the 4 osteoarthritis patients at the time of the primary operation, in whom the femoral head and the resurfacing implant were removed for analysis
