Explanation:
The vertebral bodies and intervertebral discs together bear the majority of axial compressive loads transmitted through the spine. The disc distributes compressive forces through its nucleus pulposus and annulus fibrosus structure. This design allows efficient load transmission and shock absorption. Posterior elements such as facet joints mainly resist shear and rotational forces. Damage to the vertebral body or disc significantly compromises spinal load-bearing capacity. This principle explains why compression fractures predominantly involve vertebral bodies. Reference: Adams MA. "Biomechanics of the Intervertebral Disc." Spine, 2006.