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Anteroposterior knee radiograph with preoperative templating for medial closing-wedge proximal tibia osteotomy. The 4° correction is calculated using the hip–knee–ankle angle and transposed to the desired cut at the proximal tibia to a point 2 cm below the lateral joint surface. The wedge of bone to be removed is measured at the medial cortex; in this case 5.7 mm.
