Biomechanical Analysis for Ameliorated Escape-resistant Intervertebral Fusion Devices

Abstract

Abstract Background This study aims to compare the sinking and shifting of an enhanced escape-proof intervertebral fusion device with a traditional TLIF intervertebral fusion device. Methods Five specimens each of the improved escape-resistant intervertebral cage and the traditional TLIF cage were selected. Four types of mechanical tests were conducted on each cage, Furthermore, a blade-cutting torque test was performed on the escape-resistant cage, with the recording of load-displacement curves and mechanical values. Results In static axial compression performance testing and static subsidence testing and dynamic subsidence testing, the improved escape-resistant cage were similar to those of the traditional TLIF ccage. In static escape performance testing, the maximum escape force when the blade rotated out for the improved escape-resistant cage (534.02 ± 21.24N) was higher than the maximum escape force when the blade did not rotate out (476.97 ± 24.45N) (P = 6.81E-04). The maximum escape force when the blade rotated out for the improved escape-resistant cage (534.02 ± 21.24N) was significantly higher than that of the traditional TLIF cage (444.01 ± 12.42N) (P = 9.82E-05). Conclusions The improved escape-resistant cage product effectively enhances the device's escape prevention and anti-subsidence performance, it demonstrates biomechanical advantages.