Stabilization Flashcards
Neutral Zone
First few degrees of motion
Movement occurs with little resistance
Elastic Zone
Starts at end of neutral zone
Stops at physiological range
Movement occurs with internal resistance
Define segmental instability
Dysfunction in one or more stabilizing components
What can segmental instability lead to?
mechanical LBP (non-specific)
Segmental Instability is a [increase/decrease] in neutral zone size
Increase
3 subsystems of stable spine
osteoligamentous subsystem
neural control subsystem
muscle (active and passive) subsystem
Passive System
Osseous ligamentous support
Limits neutral zone and stabilizes elastic zone
Active System
Muscle and fascia support
Controls motions
Stabilizes spine in response to changing loads
Neural System
CNS and PNS
Determines stability requirement and acts on muscles to produce forces
Adds stiffness by activating specific pattern of muscle activity
Clinical Tests:
Passive System
Passive Intervertebral Motion
Accessory Movement Test - (Central PA)
Stability Test - (Anterior Shear)
Clinical Test Results: Dysfunctional
Active System
Decreased contraction
Muscle Fatigue
Decreased hold time
Can’t resist load - (leg load test)
Clinical Test Results: Dysfunction Neural System
Delayed muscle onset
Altered muscle recruitment
Habitual changes in spinal movement
Which system is dysfunctional in structural instability?
Passive System
Which system is dysfunctional in functional instability?
Any. Passive, active, and/or neural
In young populations, structural instability is due to a defect in…?
Pars interarticularis
