Correlation Between Cage Positioning and Lumbar Lordosis in Transforaminal Lumbar Interbody Fusion (TLIF)

Abstract Objective The present study evaluates radiographic outcomes and the lumbar lordosis achieved with a transforaminal lumbar interbody fusion (TLIF) arthrodesis technique according to the positioning of an interbody device (cage) in the disc space. Methods This is a retrospective radiographic analysis of single-level surgical patients with degenerative lumbar disease submitted to a TLIF procedure and posterior pedicle instrumentation. We divided patients into two groups according to cage positioning. For the TLIF-A group, the cages were anterior to the disc space; for the TLIF-P group, cages were posterior to the disc space. Considering the superior vertebral plateau of the lower vertebra included in the instrumentation, cages occupying a surface equal to the anterior 50% of the midline were placed in the TLIF-A group, and those in a posterior position were placed in the TLIF-P group. We assessed pre- and postoperative orthostatic lateral radiographs to obtain the following measures: lumbar lordosis (LL) (angle L1–S1), segmental lordosis (LS) (L4–S1), and segmental lordosis of the cage (SLC). Results The present study included 100 patients from 2011 to 2018; 44 were males, and 46 were females. Their mean age was 50.5 years old (range, 27 to 76 years old). In total, 43 cages were “anterior” (TLIF-A) and 57 were “posterior” (TLIF-P). After surgery, the mean findings for the TLIF-A group were the following: LL, 50.7°, SL 34.9°, and SLC 21.6°; in comparison, the findings for the TLIF-P group were the following: LL, 42.3° (p< 0.01), SL 30.7° (p< 0.05), and SLC 18.8° (p> 0.05). Conclusion Cage positioning anterior to the disc space improved lumbar and segmental lordosis on radiographs compared with a posterior placement.

Detalles Bibliográficos

Autores principales:	Vialle,Emiliano Neves, Ramos,Guilherme Zandavalli, Hinojosa,Fabian Lopez, Guiroy,Alfredo, Rocha,Luiz Gustavo Dal'Oglio da, Arruda,André de Oliveira
Formato:	Digital revista
Idioma:	English
Publicado:	Sociedade Brasileira de Ortopedia e Traumatologia 2022
Acceso en línea:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-36162022000500821
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