Fig. 2

Effect of different LIV on sagittal alignment. In the pictures, 1) the patient whose LIV was at L3 was shown in a, b, c, and d. PT, LL, TK, and PJA in the preoperative period were 11.9°, − 40.9°, 31.8°, and 1.6° (a, b). PT, LL, TK, and PJA in the postoperative period were 1.4°, − 31.9°, 25.1°, and 0.3° (c). PT, LL, TK, and PJA in the latest follow-up were 10.3°, − 76.6°, 54.7°, 29.9° (d); 2) patient whose LIV was at L4 was shown in e, f, g, and h. PT, LL, TK, and PJA in the preoperative period were 10.2°, − 33.2°, 23.5°, and 4.5° (e, f). PT, LL, TK, and PJA in the postoperative period were 2.6°, − 44.7°, 41.2°, and 2.6° (g). PT, LL, TK, and PJA in the latest follow-up were11.2°, − 55.7°, 45.6°, and 2.4° (h). 3) Patient whose LIV was at the sacrum was shown in i–l. PT, LL, TK, and PJA in the preoperative period were 13.2°, − 3.4°, 24.4°, and 3.1° (i, j). PT, LL, TK, and PJA in the postoperative period were 15.9°, − 23.8°, 34.8°, and 1.9° (k). PT, LL, TK, and PJA in the latest follow-up were 2.4°, − 49.3°, 29.6°, and 13.9° (l)