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• W2089905480 abstract "In Brief Study Design. A retrospective comparative study. Objective. To investigate the risk factors associated with upper instrumented vertebral (UIV) fractures in adult lumbar deformity. Summary of Background Data. Long segment lumbar fusions may lead to junctional failures. The purpose of this study was to determine factors associated with junctional failures. Methods. Twenty-seven consecutive patients from 2001 to 2008 with minimum 4 levels fused, lower instrumented vertebra (LIV) of L5 or S1, upper instrumented vertebra of T10 or distal, and no previous surgery proximal to the instrumentation were retrospectively reviewed. We describe the UIV angle, the sagittal angle of the upper instrumented vertebra with the horizontal. Patients were divided into 3 groups: group 1, 7 patients with UIV fractures; group 2, 6 patients with other proximal failures; and group 3, 14 patients with no proximal complications. Results. The mean number of levels fused was 5.7 (4–7), 5.2 (4–8), and 6.2 (4–8); mean age was 64.1, 61.8, and 64.1, and mean body mass index was 33.5, 30.0, and 31.6 for groups 1, 2, and 3, respectively (P > 0.05). Osteotomies were performed in 5 of 7 in group 1, 1 of 6 in group 2, and 5 of 14 in group 3. Mean follow-up was 26.3 months. The average intraoperative UIV angle (UIV0) and immediate postoperative UIV angle (UIV1) were 18.6°/15.4° for group 1, 5.7°/5.3° for group 2, and 10.3°/7.1° for group 3 (P < 0.05). Surgical revision rates were higher in group 1 (71%) compared with groups 2 (50%) and 3 (43%). Eight of 11 (73%) patients with upper instrumented vertebra of L1 or L2 had either UIV fracture or other proximal failure compared with 5 of 16 (31%) in patients with upper instrumented vertebra of T10, T11, or T12. Conclusion. Our series of long lumbar fusions had a high long-term complication and revision rate. A high UIV angle on intraoperative lateral radiograph was strongly associated with UIV fractures. UIVs of L1 or L2 had a higher rate of adjacent segment or UIV failure. In patients undergoing long lumbar fusions, a high intraoperative upper instrumented vertebral angle was strongly associated with fractures of the upper instrumented vertebra. An upper instrumented level of L1 or L2 was associated with a significantly higher rate of proximal junctional failures compared with fusions with proximal extension to T10 to T12." @default.
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• W2089905480 date "2012-07-01" @default.
• W2089905480 modified "2023-10-14" @default.
• W2089905480 title "Upper Instrumented Vertebral Fractures in Long Lumbar Fusions" @default.
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• W2089905480 doi "https://doi.org/10.1097/brs.0b013e31824fffb9" @default.
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