Class IV Laser Therapy

What it is

Class IV laser therapy delivers wavelengths of light, typically between 800 and 1100 nanometers, at power outputs above 500 milliwatts, which distinguishes it from lower-class cold lasers. At these intensities the photons penetrate several centimeters into soft tissue, bone, and joint capsules, reaching structures that surface-level therapies cannot access. The photons are absorbed by chromophores (light-sensitive molecules) inside mitochondria, the energy-producing organelles of cells. This absorption stimulates the production of adenosine triphosphate (ATP), the cell's primary energy currency, and triggers anti-inflammatory enzymatic pathways that down-regulate pain-signaling molecules.

The clinical term for this cellular response is photobiomodulation. Research in pain neuroscience has examined laser therapy across conditions including neck pain, low back pain, shoulder pathology, and tendinopathy. A systematic review investigating laser therapy for neck disorders found evidence supporting its use in reducing pain intensity and improving cervical range of motion compared with sham treatment, with effects measured by the Visual Analog Scale (VAS). ^[2] For patients dealing with Neck Pain, this mechanism is particularly relevant because the cervical structures, muscles, facet joints, and intervertebral discs sit within the penetration range of Class IV wavelengths. The photobiomodulation process also promotes angiogenesis (new blood vessel formation) and collagen synthesis, both of which are essential for healing damaged soft tissue.

What to expect

A typical Class IV laser session at lasts between five and fifteen minutes depending on the treatment area and the condition being addressed. The therapist moves a handheld probe in slow, overlapping passes over the skin surface above the target tissue. Most patients describe a gentle warmth during the procedure. Because Class IV units operate at power levels high enough to heat tissue, both the patient and the clinician wear wavelength-specific protective eyewear throughout the session. There is no incision, no electrical current, and no recovery period following treatment.

Course length varies. Acute injuries with localized inflammation may respond within three to six sessions. Chronic degenerative conditions, including long-standing Low Back Pain, often require a longer series, commonly eight to twelve visits, before the cumulative photobiomodulation effect reaches its full clinical expression. Outcomes research in musculoskeletal care consistently notes that tracking patient-reported pain scores before, during, and after a treatment series is the most reliable way to assess individual response. ^[8] uses these progress markers to adjust session frequency and probe intensity as the case evolves. Patients are typically encouraged to maintain gentle activity between sessions, as movement supports the circulation improvements that laser therapy initiates at the cellular level.

Key benefits

• Photobiomodulation reduces prostaglandin and interleukin concentrations in inflamed tissue, which decreases the biochemical drivers of both acute and chronic pain. ^[2]
• Class IV wavelengths reach deep joint structures, including the shoulder capsule involved in adhesive capsulitis (frozen shoulder), where surface therapies produce minimal effect. ^[3]
• The therapy accelerates collagen synthesis and angiogenesis, supporting repair of tendons, ligaments, and muscle fibers that have been disrupted by injury or repetitive strain.
• Because no needles, scalpels, or pharmaceutical agents are involved, Class IV laser carries a minimal side-effect profile and does not interact with most medications.
• Patients who have reached a pain-reduction plateau with manual care alone sometimes show renewed progress when laser therapy is added to their care plan, particularly for conditions with a significant inflammatory component. ^[4]
• Reduced pain and tissue inflammation following laser sessions can improve a patient's tolerance for corrective exercise, allowing rehabilitation work to begin or progress sooner.

Who benefits most

Candidates for Class IV laser therapy tend to share one clinical characteristic: an inflammatory or degenerative process within tissue that has not resolved adequately with rest or standard manual care. Common presentations include chronic low back and disc-related pain, cervical facet syndrome, rotator cuff tendinopathy, lateral epicondylitis (tennis elbow), plantar fasciitis, and knee osteoarthritis. Patients recovering from soft-tissue injuries sustained in auto accidents also frequently benefit, because post-traumatic inflammation in muscles and ligaments responds well to the anti-inflammatory pathway activation that photobiomodulation produces. Research examining laser therapy across shoulder conditions, including those with a capsular component, found clinically meaningful pain reductions in treated groups compared with controls. ^[3]

Patients who are pregnant, who have active cancer in the treatment area, or who are taking photosensitizing medications are generally excluded from laser therapy. Individuals with pacemakers should be evaluated individually before treatment near the chest. Within those contraindications, Class IV laser has a broad applicability that spans age groups, from adolescent athletes with overuse injuries to older adults managing osteoarthritis. When combined with SoftWave Therapy, another regenerative option available at this practice, laser therapy can address both the cellular energy deficit and the extracellular tissue remodeling that chronic musculoskeletal conditions involve. For an overview of all services provides, see .

How it connects to chiropractic

Chiropractic care and Class IV laser therapy address musculoskeletal pain through complementary mechanisms. A chiropractic adjustment restores segmental joint mobility and reduces the mechanical irritation of surrounding nerve and soft tissue. Laser therapy acts at the cellular level to resolve the inflammation and tissue damage that often accumulate around hypomobile joints. When both are applied within the same course of care, the adjustment works on structure and the laser works on tissue chemistry, creating a broader therapeutic effect than either produces independently. Systematic reviews examining multimodal approaches to spinal pain note that combining manual therapy with adjunct physical modalities tends to produce more durable outcomes than single-intervention care. ^[5]

The evidence base for laser therapy across spinal and peripheral conditions has grown steadily. Studies reviewed in the Cochrane literature found statistically significant pain reduction and functional improvement in patients with neck disorders treated with low-level and Class IV laser protocols, with VAS scores improving meaningfully over sham controls. ^[1] A separate review examining chronic musculoskeletal pain found that laser-treated groups showed consistent reductions in pain intensity across multiple outcome measures, though effect sizes varied with tissue depth, wavelength, and dosage parameters. ^[6] This variability is precisely why the treating clinician's experience matters. draws on 28 years of clinical practice to calibrate dosage and probe placement based on the individual's tissue presentation, rather than applying a protocol formulaically.

In practice, laser therapy at most commonly accompanies chiropractic adjustment, spinal decompression for disc-related cases, and corrective exercise for patients working through rehabilitation. The sequencing is deliberate. Laser is often performed prior to adjustment because reducing acute periarticular (around-the-joint) inflammation makes the joint more receptive to mobilization and the patient more comfortable during the procedure. For disc cases in particular, where nerve root irritation and annular (disc wall) damage both contribute to pain, combining decompression with photobiomodulation addresses the mechanical and inflammatory dimensions simultaneously. Outcomes research in chiropractic emphasizes that functional improvement, not just pain reduction, is the meaningful endpoint. ^[8] Tracking range of motion, strength, and activity tolerance alongside VAS scores gives both the clinician and the patient a complete picture of progress. Patients interested in how laser therapy fits into a full care plan can review to arrange a consultation. For patients curious about how softwave therapy compares or complements laser as a regenerative option, that information is available as well. evaluates each case individually to determine which combination of services fits the clinical picture.

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