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Spinal Manipulation
Spinal Manipulation, also known as a High Velocity, Low Amplitude (HVLA) thrust maneuver or Spinal Manipulation Therapy (SMT), is a skilled manual therapy technique used by physical therapists to improve joint mobility, reduce pain, and restore function.
What it is
HVLA spinal manipulation involves a quick, controlled thrust delivered to a specific spinal joint that has been identified as restricted or hypomobile.
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High velocity = performed quickly
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Low amplitude = small movement within the joint’s available range
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Applied within the joint’s anatomical limits (not beyond them)
You may hear or feel a “pop” during the maneuver. This sound is called a cavitation, which occurs from gas release within the joint — not bones shifting out of place.
Why Physical Therapists Use it
In physical therapy, spinal manipulation is used as a tool to reduce pain and restore movement so patients can progress more effectively into active rehabilitation.
1. Improve Joint Mobility
When spinal segments become restricted due to injury, inflammation, or prolonged positioning, manipulation can restore accessory motion and improve overall spinal movement.
2. Decrease Pain
Research suggests HVLA techniques can:
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Reduce local muscle guarding
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Alter pain signaling at the spinal cord level
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Stimulate mechanoreceptors that modulate pain perception
Many patients report immediate symptom reduction following treatment.
3. Improve Muscle Function
Restoring joint motion often reduces protective muscle tension, allowing surrounding muscles to activate more efficiently.
4. Enhance Circulation
Improved joint mobility and decreased guarding can promote better local blood flow.
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