Adjacent Segment Disease after Long Spinal Fusion Ending at L5 for Adult Spinal Deformity: A Retrospective Cohort Study

Study Design: This is a retrospective cohort study using data from the adult spinal deformity (ASD) database of single institution. Purpose: To investigate incidence proximal junctional failure and distal (DJF) after ASD surgery with lower instrumented vertebra (LIV) at L5. Overview Literature: Spinopelvic fixation thoracic to pelvis current gold standard treatment for ASD. However, LIV L5 acceptable in some cases. Methods: Fifty-six patients who underwent corrective were included. The upper (UIV) was T7 one patient, T9 14, T10 three, T11 four, T12 eight, L1 10, L2 16. Regarding clinical parameters, age, sex, curve types Scoliosis Research Society-Schwab classification, number levels fused, follow-up period, hip bone mallow density, revision rate, radiographic measurements compared between T (UIV: - 10) TL L2) groups. Results: rate 19.6% overall. In groups, it 27.8%, 15.8%, respectively (p = 0.305). DJF group (33.3%) significantly higher than (5.3%). kyphosis (55.6%) (28.9%), no significant difference. mean global alignment, sagittal vertical axis, C7 plumb line-central sacral line not different both Conclusions: set UIV vertebrae (T7 T10) has risk adjacent segment disease.