08/06/2026
To be an effective clinician, you need to understand Panjabi’s Neutral Zone Theory.
The spine is stabilised by three systems:
1. The Passive System, vertebrae, discs, ligaments. Structures you cannot contract. They provide the architecture of restraint.
2. The Active System, muscles and tendons. Structures you can contract. They provide dynamic stability and motion control.
3. The Neural Control System: the neurological coordination of both.
The Neutral Zone is the range of motion where passive resistance is minimal. In this zone, the muscles carry primary responsibility for stability.
When the passive system is compromised, disc degeneration, ligament damage, end-range injury, the neutral zone increases. Greater laxity. Greater instability.
The active system must compensate. If it cannot, the passive structures continue to be loaded beyond their capacity.
The injury cascade is a failure of movement pattern or muscle capacity that exposes passive structure to load it can no longer tolerate.
Pain is a symptom. Find the cause. Restore active system competency. Protect what passive tissue remains.
That is the work.
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