A, Type I defect has minimal bone loss and negligible component migration. B, Type 2A defect with less than 2 cm superomedial migration. C, Type 2B defect with less than 2 cm superolateral migration. D, Type 2C defect with medial migration only. E, Type 3A defect with more than 2 cm component migration and bone loss from 10-o’clock to 2-o’clock position. F, Type 3B defect with more than 2 cm migration and bone loss from 9-o’clock to 5-o’clock position.