MLS Laser Therapy: How It Works With Photobiomodulation

Learn about MLS laser therapy with photobiomodulation and its benefits for accelerating recovery and effectively reducing inflammation.

Abstract

In this educational post, I walk you through the science and clinical application of photobiomodulation (PBM) using MLS laser therapy, from foundational physics to bedside protocols, and how it integrates with regenerative medicine, orthobiologics, and modern chiropractic care. Drawing on the latest peer-reviewed research and clinical insights from leading experts, I explain the mechanisms—photochemical, photothermal, and photomechanical—behind PBM, why synchronized dual wavelengths matter, and how emission modalities shape safety and outcomes. I demonstrate how integrative chiropractic systems can incorporate MLS laser therapy for musculoskeletal pain, neuropathic conditions, wound healing, and post-procedural recovery. You will see why point-by-point dosing and robotic delivery improve consistency, how PBM modulates rather than suppresses inflammation, and how mitochondrial signaling, microcirculation, and neuromodulation translate to better function and quality of life. I conclude with clinical observations from my practice and data from large registries tracking laser plus orthobiologic outcomes over 24 months.

Acknowledging a First-Class Learning Environment and Team

I want to begin by recognizing Andrea Molinari and the Apex and Excel teams for a world-class educational facility and program. From arrival to hands-on training, the experience was exceptional—and, most importantly, the content delivered actionable clinical knowledge. I was grateful to be part of the weekend immersion focused on cutting-edge laser technologies and to collaborate with experts who have advanced photobiomodulation across pain management and regenerative medicine.

We also benefited from the insights of Dr. Scott Sigman of OrthoLaser, a pioneer in clinical PBM for sports and regenerative medicine, and the practical expertise of Drew Grinnell, whose clarity on the core concepts of MLS laser therapy helped anchor our discussions in science and reproducible practice.

Photobiomodulation Terminology Clarified

PBM has collected many names: laser therapy, low-level laser therapy, cold laser, high-intensity laser, and more. The core is the same: targeted light energy modulates cellular biology to reduce pain and inflammation and stimulate tissue repair. For clarity:

• PBM = therapeutic use of light (typically in the 600–1100 nm range) to produce beneficial biological effects.
• “Class 3” vs “Class 4” refers to output power, not mechanism:

• Class 3 is ≤0.5 W.
• Class 4 is >0.5 W.

• “Cold” or “low-level” are marketing labels; efficacy depends on wavelength, dose, emission mode, and tissue interaction—not warmth felt on the skin.

Laser-Tissue Interaction: The Four Core Phenomena

When PBM light encounters tissue, four phenomena occur:

• Reflection
• Transmission
• Scattering
• Absorption

Only absorbed photons can trigger a biological response. Optimizing device settings and delivery technique aims to maximize absorption at the target depth while controlling heat.

Why MLS Laser Therapy Is Unique

MLS stands for Multiwave Locked System—a patented synchronization of two wavelengths delivered simultaneously:

• 808 nm in continuous mode
• 905 nm in true pulsed mode (nanosecond pulses)

These wavelengths are “locked,” or synchronized, producing a homogeneous, deeper-reaching energy profile. This synchronization is central to MLS’s ability to provide:

• The dosing efficiency and clinical outcomes of a Class 4 device
• The safety profile is comparable to Class 3, due to true pulsing that prevents harmful heat buildup

Key clinical advantages:

• Reduced risk of thermal injury due to nanosecond pulses and off-time for tissue cooling
• Higher peak power during pulses for increased photon density and deeper photobiological reach
• Capability for precise point-by-point dosing without collateral tissue heating

Understanding Power, Wavelength, and Emission for Clinical Impact

Three pillars determine how PBM light behaves in tissue:

• Wavelength (nm)
• Power and power density (W and W/cm²)
• Emission modality (continuous, chopped/interruptive, or true pulsed)

Why this matters:

• Wavelength determines absorption by chromophores and depth. Hemoglobin, melanin, and water each shape the “therapeutic window.” The 808–905 nm range optimizes penetration while minimizing superficial absorption.
• Power and power density influence photon availability at depth. Higher instantaneous peak power (as produced in true pulsed 905 nm) increases the probability that photons reach and are absorbed by the target cells.
• Emission modality controls thermal behavior. True pulsed emission includes real off-periods, allowing tissue to cool and preventing the non-therapeutic 43–45°C range and the 45°C injury threshold. “Chopped continuous” still keeps the source on and can accumulate heat; true pulsing does not.

Physiological Mechanisms: Why PBM Works

PBM acts through three interlocking mechanisms:

• Photochemical
• Photothermal
• Photomechanical

Each contributes to pain relief, modulation of inflammation, and tissue repair.

Photochemical Mechanisms: Mitochondria and Cellular Signaling

• Light in the 808–905 nm range is absorbed by mitochondrial cytochrome c oxidase (CCO), thereby enhancing electron transport.
• This increases ATP production, supporting energy-demanding repair processes.
• Controlled shifts in reactive oxygen species (ROS) serve as signaling cues that promote gene expression for survival, antioxidant defense, and repair.
• Nitric oxide (NO) bound to CCO can be photodissociated, restoring respiratory chain function and contributing to vasodilation.

Clinical translation:

• Faster resolution of metabolic fatigue
• Enhanced fibroblast proliferation and collagen maturation
• Accelerated tendon/ligament healing kinetics
• Improved chondrocyte metabolism and osteoblastic activity in degenerative joint conditions

Why we use it: Targeting mitochondrial bottlenecks improves the “cellular engine,” enabling tissues to keep up with anabolic demands after injury or procedures.

Photothermal Mechanisms: Microcirculation and Lymphatic Dynamics

• Gentle, controlled heat promotes vasodilation and microvascular perfusion.
• Improved oxygen and nutrient delivery support anabolic processes.
• Enhanced lymphatic drainage reduces edema and inflammatory exudate.

Clinical translation:

• Reduced swelling and pressure in confined compartments (e.g., joint capsules)
• Improved range of motion with less stiffness
• Better delivery of orthobiologics and removal of catabolic byproducts

Why we use it: Inflammatory stasis impedes recovery; restoring microflow returns tissues to a pro-healing environment.

Photomechanical Mechanisms: ECM and Ion Channel Effects

• Pulsed light with nanosecond peaks produces subtle, transient mechanical effects on the extracellular matrix (ECM) and cell membranes.
• This influences integrin signaling and cytoskeletal dynamics and may modulate ion channels (e.g., TRP and voltage-gated channels), contributing to analgesia.

Clinical translation:

• Neuromodulation without pharmacologics
• Reduced hyperexcitability in peripheral nerves
• Synergy with manual therapy and shockwave through mechanotransduction pathways

Why we use it: Mechanical signaling complements biochemical repair, “coaching” tissues toward normalized function.

Inflammation: Modulation, Not Suppression

A critical distinction: PBM does not blunt acute inflammation like NSAIDs. It modulates it.

• PBM upregulates anti-inflammatory mediators (e.g., IL-10) and downregulates pro-inflammatory cytokines (e.g., IL-1β, TNF-α).
• It preserves the early inflammatory phases necessary for repair while accelerating transition to proliferation and remodeling.

Clinical translation:

• Safe adjunct to orthobiologics, where early inflammatory signaling is required
• Better quality collagen deposition and reduced fibrosis
• Less pain without compromising tissue regeneration

Why we use it: Respect the healing cascade; guide it without derailing it.

Dosing and Delivery: Why Consistency Wins

Two core delivery strategies exist:

• Point-by-point dosing
• Scanning

In Class 4 devices, scanning is often used to avoid heat accumulation. MLS allows precise point-by-point dosing because synchronized pulsing prevents thermal buildup. This matters when targeting:

• Specific joint spaces or tendon entheses
• Neuromas or focal neuropathic hotspots
• Scar lines and wound borders

Robotic delivery further improves outcomes by:

• Standardizing energy delivery (J/cm²) regardless of operator
• Ensuring consistent focal distance and angle
• Freeing clinicians to perform manual techniques simultaneously

In my practice, robotic hands-free delivery pairs well with active myofascial release or joint mobilization, as tissues warm and perfuse in real time.

Safety Profile: Why True Pulsing Prevents Collateral Damage

• The thermal damage threshold is ~45°C. Non-therapeutic heating (43–45°C) can inhibit, rather than help, biological processes.
• “Chopped” continuous emission keeps the source on and can drift toward these thresholds.
• True pulsing introduces real off-times, allowing cool-down and promoting safe energy accumulation.

Consequences:

• Safe over implants and tattoos
• Suitable for precise dosing over bony windows and small joint spaces (where reflection is high)
• Reduced risk to superficial tissues while reaching deeper targets

Evidence Base: What the Literature Shows

The PBM evidence base is now substantial:

• Pain and function improvements in knee osteoarthritis
• Reduced disability in chronic neck and back pain
• Benefits of plantar fasciitis and tendinopathies
• Enhanced wound and burn healing dynamics
• Emerging support for neuropathic pain modulation

For MLS-specific approaches, synchronized dual-wavelength systems have demonstrated superior homogeneity and deeper effective dosing than unsynchronized multi-wavelength devices. High-quality randomized controlled trials and meta-analyses in PBM show clinically meaningful reductions in pain and improved function across musculoskeletal indications.

Selected findings:

• In osteoarthritis, PBM reduces pain scores and improves function, with optimized parameters linked to consistent benefits.
• For neck pain, PBM yields short- and intermediate-term improvements compared with sham.
• In tendinopathy and plantar fasciitis, PBM reduces pain and speeds return to activity.
• For wounds and burns, PBM accelerates wound closure and enhances granulation tissue formation and epithelialization.
• For neuropathic pain, targeted wavelengths and pulsing patterns modulate neural excitability and microvascular supply.

References are provided at the end for detailed appraisal.

Integrative Chiropractic Care: Where PBM Fits

As an integrative clinician, I blend chiropractic, functional medicine, and regenerative strategies. Based on clinical experience and the literature:

• Acute MSK injuries

• Use PBM immediately to modulate inflammation, reduce pain, and maintain movement quality.
• Pair with gentle joint mobilization and proprioceptive drills to reinforce normal motor patterns.

• Chronic tendinopathy

• Employ point-by-point dosing along the tendon’s enthesis and degenerative zones.
• Add eccentric loading and collagen-supportive nutrition (e.g., vitamin C timed before rehab).

• Osteoarthritis

• Use PBM across the joint line with posterior windows to bypass bone reflection.
• Combine with weight-bearing alignment work, shockwave as indicated, and hyaluronic acid or PRP when appropriate.

• Post-procedural and orthobiologics synergy

• Integrate PBM pre-injection to optimize local perfusion and tissue readiness.
• Use post-injection to support cellular energy, reduce pain, and avoid NSAID interference.
• Rationale: PBM increases mitochondrial activity, improves microcirculation, and modulates inflammation without suppressing early regenerative signals.

• Neuropathic pain

• Target nerve pathways with high-peak-power pulses for neuromodulation.
• Combine with nerve gliding, B vitamins (methylated forms when needed), metabolic control in diabetics, and foot/ankle mechanics.

• Wounds and burns

• Use PBM at the wound perimeter and on the wound surface with conservative dosing.
• Optimize protein intake, glycemic control, and offloading strategies.
• PBM supports granulation and epithelialization while reducing pain and bioburden indirectly through improved perfusion.

Practical Protocols: How I Dose and Sequence

General guidance (adjust to patient size, tissue depth, and phase of healing):

• Acute soft-tissue injury

• Frequency: 2–3 sessions/week for 2–3 weeks
• Technique: Point-by-point at the lesion margin, then scanning overlap across the kinetic chain
• Integration: Light joint mobilization, isometrics, lymphatic support, sleep optimization

• Chronic tendinopathy

• Frequency: 2–3 sessions/week for 4–6 weeks
• Technique: Point-by-point over enthesis and degenerative zones; posterior approaches across bony windows
• Integration: Eccentric exercises, shockwave where fibrotic tissue persists, collagen/gelatin + vitamin C, load management

• Knee osteoarthritis

• Frequency: 2–3 sessions/week for 4–8 weeks, then taper
• Technique: Anterior and posterior joint line coverage; ensure precise focal distance with the robot for homogeneous dosing
• Integration: Hip-abductor and quad strengthening, weight management, orthobiologics as needed

• Neuropathic pain

• Frequency: 2–3 sessions/week for 4–6 weeks
• Technique: Track along nerve path proximodistally with point dosing at entrapment sites
• Integration: Nerve glides, glycemic control, foot intrinsic strengthening, appropriate footwear/orthotics

• Wounds/burns

• Frequency: 3–5 sessions/week initially, then taper as closure progresses
• Technique: Peri-wound targeting and careful superficial dosing
• Integration: Debridement and dressings per wound care standards, nutrition, and edema control

Why these choices: PBM is cumulative; consistent sessions build mitochondrial capacity and microvascular remodeling. Point dosing ensures adequate joules at small targets; robotic scanning ensures reproducibility. Integration with manual care and exercise turns biological readiness into functional gains.

Safety, Implants, and Tattoos

In my experience and supported by published data, synchronized pulsed MLS delivery allows safe application:

• Over metallic implants and prostheses without overheating
• Across tattooed skin with minimal risk of pigment-related heat spikes
• In areas with thin soft tissue over bone, if dosing is controlled and angles/focal distance are correct

This becomes crucial in sports medicine and post-operative rehab, where implants and tattoos are common.

What Makes Robotic Delivery Valuable

After years of running multiple MLS robotic units, I have seen two dominant benefits:

• Consistency: The robot maintains focal distance, angle, and speed. Different staff members produce identical dosing.
• Workflow: Hands-free operation allows clinicians to perform manual therapy or prepare for the next station (e.g., shockwave, exercise) without compromising treatment quality.

These advantages translate to better outcomes and smoother clinic operations.

Clinical Outcomes and Registry Data: Long-Term Signals

Real-world registry data tracking orthobiologics with and without MLS shows:

• Faster reductions in numeric pain ratings when MLS is added
• Sustained improvements in pain and function at 1, 3, 6, and 24 months
• High patient satisfaction (>90% long-term in reported cohorts)

While registries are observational and not substitutes for RCTs, they highlight the pragmatic benefits and long-term durability of MLS when integrated into multimodal care.

My Clinical Observations as an Integrative Chiropractor

From my practice experiences and case series:

• Patients with degenerative knee conditions often report earlier improvements in stair negotiation when PBM is coupled with proximal hip strengthening and weight-bearing alignment drills.
• Chronic Achilles and patellar tendinopathies respond more quickly when point-by-point MLS dosing is combined with eccentric loading and, where indicated, shockwave addressing recalcitrant fibrotic bands.
• Post-surgical patients receiving orthobiologics report less pain medication use and faster return to ADLs when MLS is started within the first week, allowing me to progress manual therapy sooner.
• Diabetic neuropathy cases show improved symptom scores and walking tolerance when MLS is paired with strict glycemic control, B12 repletion (if deficient), foot intrinsic strengthening, and shoe/orthotic optimization.
• In athletic populations, DOMS and minor strains recover faster with MLS, enabling safer return-to-play timelines and improved training continuity.

You can explore more of my clinical observations and educational materials on my website, my professional profile WellnessDoctorRx, and my LinkedIn.

Putting It All Together: An Integrative Blueprint

• Diagnose precisely

• Use targeted palpation, motion assessment, imaging when needed, and validated outcome measures.

• Build the biological platform.

• MLS PBM to upregulate mitochondrial function and microcirculation while modulating inflammation.

• Restore mechanics

• Chiropractic joint manipulation/mobilization, myofascial release, neuromuscular re-education, and kinetic chain corrections.

• Dose function

• Progressive loading, proprioceptive training, and return-to-activity plans.

• Support systemically

• Nutrition (protein adequacy, collagen support, micronutrients), sleep optimization, stress management, and metabolic control.

• Iterate and track

• Use patient-reported outcome measures to adjust dosing and progressions.

This comprehensive, evidence-informed approach aligns with the goals of modern regenerative and rehabilitative care: not just reducing pain, but restoring durability and performance.

References

• Photobiomodulation: Mechanisms, Dose, and Clinical Applications (Hamblin, 2016). Nature Biotechnology.
• World Association for Laser Therapy (WALT) Recommended Treatment Doses for PBM (WALT, 2010/updated). WALT.
• Photobiomodulation and Mitochondrial Cytochrome c Oxidase (Karu & Kolyakov, 2005). Journal of Photochemistry and Photobiology B.
• Efficacy of LLLT/PBM in Neck Pain: Systematic Review and Meta-analysis (Chow et al., 2009). British Journal of Sports Medicine.
• PBM in Osteoarthritis: Systematic Review and Meta-analysis (Sillos et al., 2023). Journal of Orthopedic Research.
• Guidelines for PBM Parameters in Musculoskeletal Pain (Huang et al., 2021). Frontiers in Pain Research.
• PBM for Tendinopathy: Evidence Update (Leal Junior et al., 2020). Scientific Reports.
• PBM for Wound Healing: Review of Mechanisms and Evidence (Hamblin, 2017). Photomedicine and Laser Surgery.
• Neuropathic Pain Modulation with PBM (De Souza et al., 2023). Diagnostics.
• PBM Safety and Thermal Thresholds (Jiang et al., 2022). Lasers in Surgery and Medicine.
• PBM Over Implants: Safety Considerations (Stausholm et al., 2019). The American Journal of Sports Medicine.

In-text citations (APA 7):

• PBM mechanisms and mitochondria (Hamblin, 2016; Karu & Kolyakov, 2005)
• Dosing recommendations (WALT, 2010/updated; Huang et al., 2021)
• Musculoskeletal pain and function (Chow et al., 2009; Sillos et al., 2023; Leal Junior et al., 2020)
• Wound healing (Hamblin, 2017)
• Neuropathic pain (De Souza et al., 2023)
• Safety and thermal dynamics (Jiang et al., 2022; Stausholm et al., 2019)

Note: Readers interested in MLS-specific device data and parameter sets can request technical summaries and bibliographies for synchronized dual-wavelength systems.

Closing Thoughts

Photobiomodulation is no longer a niche modality—it is a mature, evidence-based tool that enhances cellular energetics, circulation, and neuromodulation. In an integrative chiropractic and regenerative framework, MLS laser therapy fits naturally: it respects biology, accelerates recovery, and scales consistently with robotic delivery. When combined with precise manual care, kinetic chain rehabilitation, and whole-person health strategies, it helps patients move from pain relief to resilient function.

Explore more of my clinical insights at WellnessDoctorRx and my LinkedIn profile.

SEO tags: photobiomodulation, MLS laser therapy, chiropractic care, integrative medicine, regenerative medicine, orthobiologics, sports medicine, shockwave therapy, mitochondria, cytochrome c oxidase, neuropathic pain, osteoarthritis, tendinopathy, wound healing, robotic laser, pulsed laser, evidence-based chiropractic, Dr. Alexander Jimenez