Ferguson, Thompson, and King two-stage osteotomy. A, Segment of bone resected from medial half of tibia (blue lines) and cut into chips for grafting. B, Grafts placed in defect to complete first stage. Second stage is delayed until sufficient callus has formed across defect. Varus deformity is corrected by resecting wedge of bone laterally (blue lines). C, Deformity has been corrected, and union is solid.