Author/Authors :
Dantas Matos, Thiago Universidade de São Paulo - Faculdade de Medicina de Ribeirão Preto - Departamento de Cirurgia Ortopedia e Traumatologia, Ribeirão Preto, SP, Brazil , Barra Caiado Fleury, Rodrigo Universidade de São Paulo - Faculdade de Medicina de Ribeirão Preto - Departamento de Cirurgia Ortopedia e Traumatologia, Ribeirão Preto, SP, Brazil , de Oliveira Teixeira, Kelsen Universidade de São Paulo - Faculdade de Medicina de Ribeirão Preto - Departamento de Cirurgia Ortopedia e Traumatologia, Ribeirão Preto, SP, Brazil , Romero, Valéria Universidade Estadual de Campinas - Medical School, Campinas, SP, Brazil , Luiz Aparecido Defino, Helton Universidade de São Paulo - Faculdade de Medicina de Ribeirão Preto - Departamento de Cirurgia Ortopedia e Traumatologia, Ribeirão Preto, SP, Brazil
Abstract :
Objective: To evaluate the morphological changes on the interver-
tebral foramen and segmental lordosis related to the transforam-
inal lumbar interbody fusion (TLIF) positioning. Methods: PEEK
cages were placed in the disc space (L1-S1) of a polyurethane
anatomical model. Cages of different heights (8 mm, 10 mm,
12 mm and 14 mm) were positioned in the posterior, medial or
anterior part of the vertebral body surface, and the intervertebral
foramen and segmental lordosis heights were measured after
their insertion. Results: The vertebral foramen height decreased
in all positions and heights of the cages in relation to the control.
The cage posterior positioning induced a smaller reduction in the
vertebral foramen height. Vertebral lordosis tended to increase
in relation to the control, and the greatest increase occurred with
the cage posterior positioning. Conclusion: Cage positioning
induces changes in the intervertebral foramen height and in the
vertebral segment lordosis. Cage posterior positioning induces
a smaller reduction of the intervertebral foramen height and
increases the vertebral segment lordosis. Level of evidence III,
Therapeutic study.
