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The occurrence of lumbar disc herniation is closely related to the mechanical state, and it is necessary to study the internal mechanical behavior of the intervertebral disc under different loading conditions. In this study, the unconfined experiments were conducted by applying an optimized Digital Image Correlation (DIC) technique, and the internal displacement was analysed for the intervertebral disc under axial compression with flexion position. It is found that the average axial displacement is compressive in posterior AF, and the axial displacement in the outer region is significantly lower than that in the inner region, while the axial displacement in the lower region is significantly lower than that in the upper region. It is noted that the average radial displacement is tensile in posterior AF, and the radial displacement in the inner region is significantly lower than that in the outer region, while the radial displacement in the upper region is significantly lower than that in the lower region.

The displacement state of the posterior annulus in the intervertebral disc under flexion