RT Journal Article
SR Electronic
T1 Prediction of Postoperative Segmental Lordosis at L5 to S1 After Single-Level Anterior Lumbar Interbody Fusion
JF International Journal of Spine Surgery
JO Int J Spine Surg
FD International Society for the Advancement of Spine Surgery
SP 8751
DO 10.14444/8751
A1 Williams, Gabriella P.
A1 Giraldo, Juan P.
A1 Zhou, James J.
A1 Sawa, Anna G. U.
A1 Lee, Jonathan J.
A1 Abbatematteo, Joseph M.
A1 Kelly, Brian P.
A1 Turner, Jay D.
A1 Snyder, Laura A.
A1 Uribe, Juan S.
YR 2025
UL https://www.ijssurgery.com/content/early/2025/04/08/8751.abstract
AB Background Anterior lumbar interbody fusion (ALIF) is used to improve spinopelvic alignment, most commonly by increasing segmental lordosis (SL) at L5 to S1. Achieving certain radiographic parameters is critical for good patient outcomes. However, the relationships between pre- and postoperative SL and interbody dimensions are inexact and have not been well studied. This study investigated the relationships between postoperative SL at L5 to S1, ALIF cage angle, and preoperative radiographic measurements to improve the predictability of surgical radiographic outcomes after L5 to S1 ALIF.Methods A single-center database was retrospectively reviewed for patients who underwent L5 to S1 ALIF from January 2017 to December 2022. Patients with posterior percutaneous instrumentation were included in the study, but patients with posterior decompression or facetectomies at L5 to S1 were excluded. Pre- and postoperative scoliosis films and patient surgical data were analyzed. A multilinear regression analysis was performed to create a predictive model of postoperative L5 to S1 SL.Results This study evaluated 46 single-level L5 to S1 ALIFs. Using mixed-effects linear regression analysis, postoperative L5 to S1 SL can be predicted with statistical significance (P < 0.001) and power of 0.98 if the cage angle and preoperative L5 to S1 SL are known using the following formula: SLpost = 8.741 + (0.454 × C) + (0.595 × SLpre), where SLpost is postoperative L5 to S1 SL in degrees, C is cage angle in degrees, and SLpre is preoperative L5 to S1 SL in degrees.Conclusions Cage angle and preoperative L5 to S1 SL were predictive of postoperative SL after L5 to S1 ALIF. The ability to predict postoperative radiographic values is critically important for good patient outcomes, and efforts should be made to develop more sophisticated mathematical models.