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Radiological measurement. Disc height = (AB + CD)/2; segmental lordosis = angle AEB; cage height = (FG + HI)/2; CH—preoperative disc height = (FG + HI) − (AB + CD); foraminal height = JK; foraminal area = gray area. A: Antero-inferior corner; C: postero-inferior of the upper vertebra; B: antero-superior corner; D: postero-superior corner of the lower vertebra; J: center of the lower pedicle cortex; K: center of the upper pedicle cortex.
