05/24/2026
Why spine injuries don’t fully heal
Here’s something most people, and even some clinicians, don’t fully appreciate:
Your spinal ligaments and discs are among the poorest-healing tissues in the entire body. Not because the injury is too severe. Because the biology is working against you from the start.
🩸 The blood supply problem:
All ligaments — including your spinal ligaments (the PLC, ligamentum flavum, interspinous, and supraspinous) — have limited vascularity.
Healing doesn’t happen through regeneration. It happens through scar tissue. And scar tissue is weaker, less organized, and biomechanically inferior to the original.
The disc is the worst offender:
The intervertebral disc is the largest avascular structure in the human body. It has zero direct blood supply — it relies entirely on diffusion through the cartilaginous endplates for nutrition.
When the annulus tears, healing is slow, incomplete, and often stops at the middle third of the disc, the limit of vascular pe*******on.
What the research shows:
→ Scar-repaired ligament = ↑ Type III/V collagen, ↓ cross-links, ↑ creep
→ The Posterior Ligamentous Complex (PLC) is clinically treated as non-healing — PLC disruption scores 3 pts in the TLICS classification and typically indicates surgery
→ Vascular compromise in the posterior longitudinal ligament may actually precede disc degeneration, meaning poor blood flow isn’t just a consequence, it may be a primary driver
→ Even spinal fusion hardware causes stress-shielding that degrades ligament mechanical properties in adjacent segments.
Takeaway:
This explains why chronic spinal pain persists after “normal” imaging, why patients feel unstable long after their acute injury resolves, and why passive rest alone is rarely sufficient.
Rehabilitation, load management, and addressing the neurological consequences of ligamentous laxity are essential — not optional.
