In OA/DDD progression, how does disc height relate to facet joint stress?

In OA/DDD progression, how does disc height relate to facet joint stress?

• A. Loss of disc height reduces stress on the facet joints.
• B. Loss of disc height increases stress on the facet joints.
• C. Disc height remains unchanged with progression.
• D. Facet joints are not involved in OA/DDD progression.

Answer: (B)

When disc height is lost in OA/DDD progression, the intervertebral space becomes smaller and the spine’s load-bearing pattern shifts. The disc normally helps distribute axial load; with reduced height, the anterior column loses its cushioning, and the posterior elements—especially the facet joints—end up bearing a greater share of the load. This increased contact force and altered mechanics (including more shear and altered alignment) compress and stress the facet joints more than before. Over time, that extra stress drives facet joint degeneration, leading to facet arthropathy and related pain. So, disc height loss actually increases facet joint stress, rather than reducing it or leaving it unchanged.

When disc height is lost in OA/DDD progression, the intervertebral space becomes smaller and the spine’s load-bearing pattern shifts. The disc normally helps distribute axial load; with reduced height, the anterior column loses its cushioning, and the posterior elements—especially the facet joints—end up bearing a greater share of the load. This increased contact force and altered mechanics (including more shear and altered alignment) compress and stress the facet joints more than before. Over time, that extra stress drives facet joint degeneration, leading to facet arthropathy and related pain. So, disc height loss actually increases facet joint stress, rather than reducing it or leaving it unchanged.