• Kuan-Jung Chen, Yen-Chun Huang, Hsi-Hsien Lin, Po-Hsin Chou, Shih-Tien Wang, Chien-Yuan Wang, Ming-Chau Chang, and Yu-Cheng Yao.
• Department of Orthopaedics, China Medical University Hsinchu Hospital, Hsinchu, Taiwan; Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Orthopaedics, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.
• World Neurosurg. 2023 May 1; 173: e629e638e629-e638.

ObjectivesTo identify cage and end plate factors of cage subsidence (CS) in patients who underwent oblique lateral interbody fusion (OLIF) and their association with patient-reported outcomes.MethodsSixty-one patients (43 women and 18 men), with a total of 69 segments (138 end plates) which underwent OLIF at a single academic institution between November 2018 and November 2020, were included. All the end plates were separated into CS and nonsubsidence groups. Cage-related parameters (cage height, cage width, cage insertion level, and cage position) and end plate-related parameters (position of end plate, Hounsfield unit value of the vertebra, end plate concave angle [ECA], end plate injury, and angular mismatch measured with cage/end plate angle [C/EA]) were compared and analyzed using logistic regression to predict CS. Receiver operating characteristic curve analysis was used to determine the cutoff points of the parameters.ResultsPostoperative CS was identified in 50 of the 138 end plates (36.2%). The CS group had significantly lower mean Hounsfield unit values of the vertebra, higher rate of end plate injury, lower ECA, and higher C/EA than the nonsubsidence group. ECA and C/EA were identified as independent risk factors for developing CS. The optimal cutoff points for ECA and C/EA were 176.9° and 5.4°, respectively.ConclusionsAn ECA greater than 176.9° and a cage/end plate angular mismatch greater than 5.4° were found to be independent risk factors of postoperative CS after the OLIF procedure. These findings aid in preoperative decision-making and intraoperative technical guidance.Copyright © 2023 Elsevier Inc. All rights reserved.

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