PT  - JOURNAL ARTICLE
AU  - CHENG, DAVID
AU  - HALL, MICHAEL
AU  - PENALOSA, BRYAN
AU  - DANISA, OLUMIDE
AU  - CHENG, WAYNE
TI  - Can L5 Be Trusted During Proximal Extension of Fusion? A Case Series and a Review of the Literature
AID  - 10.14444/7043
DP  - 2020 Jun 01
TA  - International Journal of Spine Surgery
PG  - 321--326
VI  - 14
IP  - 3
4099  - https://www.ijssurgery.com/content/14/3/321.short
4100  - https://www.ijssurgery.com/content/14/3/321.full
SO  - Int J Spine Surg2020 Jun 01; 14
AB  - Background: Debate on whether to stop fusion at L5 or to extend fusion to S1 in a long spinal construct has been a controversial topic in spine surgery. Fewer data are available to support whether to include a prior solid fusion at L4–L5 or to extend to S1 during a proximal extension of fusion to T10. The purpose of this review is to report and discuss 2 cases of L5 vertebra fracture after proximal extension of solid L4–L5 fusion to T10 and to provide a guideline to surgeons based on the available literature.Methods: Case report and literature review.Results: Literature review identified multiple publications with levels of evidence from level 2 to level 4. Advanced L5–S1 degeneration with long-segment fusion to L5 is reported to be greater than 60% with a new rate of symptom development approaching 20%–25%. There is no prior literature specific to L5 fracture development after thoracic lumbar fusion with the lowest instrumented level at a fused L4–L5 segment. Reoperation rate is not consistently affected by the lowest instrumented vertebral level L5 versus sacrum/ilium.Conclusions: Literature review is inconclusive as to the need to include the lumbosacral junction when performing a proximal extension of fusion from L5 to the thoracic spine, especially during a revision adult deformity surgery. Stress of the long lever arm of a long-segment thoracolumbar fusion above a prior solid L4–L5 fusion could cause the L5 vertebra to split in the coronal plane, resulting in vertebral body fracture even with a mildly degenerated disc at L5–S1 prior to surgery.Level of Evidence: 4.