Chiropractic Adjustment: Definition and Clinical Context

What Is a Chiropractic Adjustment?

A chiropractic adjustment — also called spinal manipulation — is the application of a controlled, directed force to a specific spinal or extremity joint. The goal is to restore normal joint motion, correct misalignment (subluxation), reduce mechanical nerve irritation, and improve overall musculoskeletal function.

The adjustment is the foundational technique of chiropractic medicine and the primary intervention that distinguishes doctors of chiropractic from other healthcare providers.

The Mechanics of an Adjustment

During a chiropractic adjustment, the doctor positions the patient to isolate the target joint and applies a quick, precise thrust — called a high-velocity, low-amplitude (HVLA) thrust — to the joint. This thrust moves the joint briefly beyond its normal passive range of motion (but within its safe anatomical range), achieving several effects:

Joint cavitation: The characteristic "pop" or "crack" associated with chiropractic adjustments is joint cavitation — the rapid release of dissolved gases (primarily carbon dioxide and nitrogen) from the synovial fluid within the joint capsule. The sound is benign and not the sound of bones cracking.

Restoration of joint mobility: Hypomobile joints — those with reduced movement due to adhesions, muscle guarding, or misalignment — regain mobility after adjustment. This improved mobility reduces local pain and improves biomechanical function throughout the kinetic chain.

Neurological effects: The adjustment stimulates mechanoreceptors in joint capsules and surrounding tissue, sending proprioceptive signals to the brain that modulate pain perception and muscle tone. This is one reason patients feel immediate relief after an adjustment even before tissue-level changes occur.

Muscle guarding reduction: The neurological response to adjustment reduces reflexive muscle spasm around the adjusted joint, improving tissue extensibility and range of motion.

Types of Chiropractic Adjustment

Not all adjustments involve the same technique:

• Diversified technique: The most common manual HVLA technique, applied by hand with a short, quick thrust
• Activator method: A small handheld instrument delivers a gentle, controlled impulse — preferred for patients who are more comfortable with a lower-force approach, including seniors and children
• Drop-table technique: The treatment table has sections that drop slightly during the adjustment, reducing the force required
• Flexion-distraction: A gentle, repetitive motion technique often combined with spinal decompression for disc conditions

Dr. McNamara selects technique based on each patient's condition, age, body type, and preference.

What Adjustments Can and Cannot Do

Chiropractic adjustment is highly effective for:

• Acute and chronic low back pain
• Neck pain
• Headaches originating from cervical dysfunction
• Extremity joint dysfunction (shoulder, hip, ankle)

For patients with significant disc pathology — herniation, severe degeneration — adjustment alone may provide only partial relief. This is why McNamara Chiropractic Center offers advanced decompression therapy as part of combination programs. The adjustment addresses joint alignment and mobility; decompression addresses the disc itself.

Questions about your care? Call (954) 943-1100 or learn about our comprehensive programs.

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McNamara Chiropractic Center | 3320 N. Federal Highway, Suite 101, Lighthouse Point, FL 33064 | (954) 943-1100