The Spinal Deformity Study Group proposed a classification of lumbosacral spondylolisthesis.
Patient selection: L5-S1 spondylolisthesis
Parameters:
(1) slip grade in percent
(2) sacropelvic balance
(3) global spinopelvic balance
Slip Grade
Sacropelvic Balance
Global Spinopelvic Balance
Type
< 50%
< 45° low pelvic incidence)
balanced
1
45-60° (normal pelvic incidence)
2
> 60° (high pelvic incidence)
3
>= 50%
4
retroverted
5
unbalanced
6
where:
• The sacropelvis is balanced if there is a high sacral slope and low pelvic tilt.
• The sacropelvis is retroverted if there is a low sacral slope and high pelvic tilt.
• The global spinopelvis is balanced if the C7 plumb line runs between the femoral heads and sacrum.
• The global spinopelvis is unbalanced if the C7 plumb line runs anterior to the femoral heads OR posterior to the sacrum.
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Specialty: Surgery, orthopedic
