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Distal bone resorption: zones A–D. Endosteal resorption: zones 1–12. Cortical thinning: zones 1–12. Cancellization: zones A–D and 1–12. Trabecular streaming or buttressing: zones 1, 6, 7, and 12. The stage-1 postoperative film shows the bone immediately following implantation of the device. Each 2-year film shows an example of distal bone resorption (panel a), endosteal resorption (b), cortical thinning (c), cancellization (d), and trabecular streaming or buttressing (e).
