Biomechanical stability of a bioabsorbable self-retaining polylactic acid/nano-sized β-tricalcium phosphate cervical spine interbody fusion device in single-level anterior cervical discectomy and fusion sheep models

摘要: Purpose The aim of this study was to investigate the biomechanical stability provided by a novel, polylactic acid/nano-sized, β-tricalcium phosphate, bioabsorbable, self-retaining cervical fusion cage (BCFC). Methods Quasistatic nonconstraining torques (maximum 1.5 NM) induced flexion, extension, lateral bending (±1.5 NM), and axial rotation on 32 sheep spines (C2-C5). motion segment C3-C4 first tested intact; following groups were after complete discectomy: autologous tricortical iliac crest bone graft, Medtronic-Wego polyetheretherketone (PEEK) cage, Solis PEEK BCFC. graft group with an anterior plate. mean range (ROM) calculated from load-displacement curves. Results BCFC significantly decreased ROM in compared other implants, no significant difference between two types cages could be observed flexion extension. Anterior plate (ACP) but plus ACP determined rotation. Conclusion device showed better single-level discectomy models thus may potential alternative current cages.