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Table 4 Mean pre-op, postop and FU values of “unbalanced” group patients

From: High grade isthmic spondylolisthesis; can reduction always re-align the unbalanced pelvis?

X-Ray index

Pre-op

Post-op

FU

Listhesis percentage

81% (63–141)

45,6% (4–149)

62,5% (19–154)

Lumbar-sacral angle (LSA)

−22° (− 58 to + 15)

−9,1° (− 58 to + 15)

− 15,4° (− 47 to + 11)

Lumbar lordosis (LL)

54,53° (68–29)

53° (40–63)

50,7° (38–65)

Sacral slope (SS)

40° (20–58)

44° (19–53)

41,6° (19–60)

Pelvic tilt (PT)

29,4° (17–41)

24,1° (13–45)

30,8° (15–49)

Pelvic incidence (PI)

71,9° (49–88)

71,6° (51–87)

72,7° (41–89)