About the research on this page. The studies cited here investigate photobiomodulation (PBM) as a therapeutic modality and the specific wavelengths used in PBM research — not Mito Red Light devices. The wavelengths in our panels were chosen because the peer-reviewed PBM literature supports them. Evidence levels and study counts reflect the broader research base, not studies of our products. See the full methodology note at the bottom of this page.

Red Light Therapy for Joints, Tendons & Orthopedics: Clinical Evidence & Research

952 StudiesPhotobiomodulation (PBM) Source-linked

What the research shows

Our evidence rating: Very low certainty for knee osteoarthritis pain (GRADE, per authors); moderate for tendinopathy with exercise; mixed for carpal tunnel and rheumatoid arthritisUpdated Reviewed by Alexis Cowan, PhD

For knee osteoarthritis, light therapy reduces pain. A 2024 meta-analysis of 10 trials found less pain at rest than placebo, with very low certainty (Oliveira 2024), and a 2025 network meta-analysis of 32 trials (2,078 participants) ranked low-level laser first among physical treatments for knee pain and function (Lan 2025). In tendinopathy, light combined with exercise reduced pain and improved function more than sham plus exercise in 17 trials (Tripodi 2021). After fractures, light reduced pain at one week and improved grip strength at four weeks, without long-term or bone-healing benefits (Wang 2026).

Other joint results are mixed. In carpal tunnel syndrome, 13 trials found better hand function but no significant pain or grip-strength benefit (Lauxen 2025). In rheumatoid arthritis, 22 studies found better grip strength and less morning stiffness but no pain reduction (Salajegheh 2024). Most authors recommend light as an add-on to exercise and other proven care, not on its own.

Based on 952 indexed studies in this category, 241 of them in people. These studies test photobiomodulation in general, not Mito Red Light devices.

Evidence by condition

Number of studies in our database for each condition. Direction and certainty are shown only where a meta-analysis or systematic review reports them; otherwise the row says "not graded".

ConditionHuman randomized trialsAll human studiesDirection of resultsCertainty
Carpal tunnel syndrome 27 38 Better function; no significant pain benefit
Lauxen 2025 (PMID 39776290)
Not graded by authors
Osteoarthritis (knee) 26 33 Less knee pain versus placebo
Oliveira 2024 (PMID 38775202); Lan 2025 (PMID 40192971)
Very low (GRADE)
Tennis elbow 19 30 Not graded Not graded
Osteoarthritis 25 30 Not graded Not graded
Rheumatoid arthritis 12 21 Less stiffness and better grip; no pain benefit
Salajegheh 2024 (PMID 39574241)
Not graded by authors
Achilles tendon 10 13 Not graded Not graded
Fractures 6 7 Short-term pain relief; no bone healing benefit
Wang 2026 (PMID 42080480)
Not graded by authors
Bone 0 6 Not graded Not graded
Osteoporosis 2 5 Not graded Not graded
Osteoarthritis (hand) 4 5 Not graded Not graded
Arthritis (juvenile) 3 4 Not graded Not graded
Joints 3 4 Not graded Not graded
Spinal disk herniation 3 4 Not graded Not graded
Osteoarthritis (cervical) 1 3 Not graded Not graded
Lumbar radiculopathy 2 3 Not graded Not graded

Key studies: Joints, Tendons & Orthopedics

The strongest human evidence: systematic reviews and meta-analyses first, then the newest randomized trials. Each card comes straight from our study database and links to the paper.

Meta-analysis

Effectiveness of Photobiomodulation in Reducing Pain and Disability in Patients with Knee Osteoarthritis: A Systematic Review with Meta-Analysis

et al., Phys Ther, 2024. PMID 38775202

Key finding (checked against the abstract)10 trials, 542 participants with knee osteoarthritis. Less pain at rest than placebo (-0.7 points), with no significant effect on the Timed Up and Go test. Very low certainty.
Population
Human
Meta-analysis

Physical modalities for the treatment of knee osteoarthritis: a network meta-analysis

et al., Aging Clin Exp Res, 2025. PMID 40192971

Key finding (checked against the abstract)Network meta-analysis of 32 randomized trials, 2,078 participants. Low-level laser ranked highest of the physical treatments for knee pain and function; ultrasound showed no benefit.
Meta-analysis

Photobiomodulation in carpal tunnel syndrome with pain, strength, and functionality analysis: a systematic review and meta-analysis

et al., Lasers Med Sci, 2025. PMID 39776290

Key finding (checked against the abstract)13 randomized trials in carpal tunnel syndrome. Better hand function, but no significant benefit for pain (p = 0.08) or grip strength (p = 0.11).
Meta-analysis

The effect of low-level red and near-infrared photobiomodulation on pain and function in tendinopathy: a systematic review and meta-analysis of randomized control trials

et al., BMC Sports Sci Med Rehabil, 2021. PMID 34391447

Key finding (checked against the abstract)17 trials, 835 participants with tendinopathy. With exercise, light reduced pain (1.06 points) and improved function more than sham plus exercise. Very low to moderate quality (GRADE).
Meta-analysis

Low level laser therapy and rheumatoid arthritis: a systematic review and meta-analysis study

et al., Eur J Transl Myol, 2024. PMID 39574241

Key finding (checked against the abstract)22 studies in rheumatoid arthritis. No pain reduction versus placebo, but better grip strength and less morning stiffness.
Meta-analysis

Effect of photobiomodulation on pain relief and functional improvement in fractures: a systematic review and meta-analysis

et al., Ann Med, 2026. PMID 42080480

Key finding (checked against the abstract)9 pooled trials after fractures. Less pain at one week (MD -0.74) and better grip strength at four weeks; no differences at 4 to 26 weeks or in bone healing.
Population
Meta-analysis

Studies that found no effect

Not every trial is positive. "No effect" means the main outcome did not differ from sham or control. "Mixed" means some outcomes improved but the outcome named here did not differ.

YearStudyDesignResultOutcome with no difference
2026 Intraoperative Intramedullary Photobiomodulation Therapy for Consolidation of Atypical Femoral Fractures in Elderly Women: A Pilot Study RCT, n = 11 No effect Healing, complications and function after surgery versus control
2026 Efficacy of laser acupuncture for patients with knee osteoarthritis: a systematic review and meta-analysis of randomized controlled trials Meta-analysis No effect Pain and function in knee osteoarthritis (laser acupuncture)
2025 The effects of low-level laser therapy in extensor tendon injuries between zones 5 and 8 of the hand: A double-blind, randomized, placebo-controlled study RCT, n = 55 No effect Rehabilitation outcomes after extensor tendon repair
2026 Effect of photobiomodulation on pain relief and functional improvement in fractures: a systematic review and meta-analysis Meta-analysis Mixed Pain and function at 4-26 weeks (grip strength improved)

Latest human studies: Joints, Tendons & Orthopedics

The 25 most recent human studies in our database for this category.

YearStudyDesignPopulation
2026 Ultrasound-Guided Low-Level He-Ne Laser Therapy Following Acupotomy Release for Carpal Tunnel Syndrome: A Multicenter Retrospective Study. Human study, n = 163 Human: 163 participants
2026 Preoperative photobiomodulation versus nonsteroidal anti-inflammatory drugs for pain and early functional recovery after total knee arthroplasty: a randomized controlled trial. RCT, n = 80 Human: 80 participants
2026 Effectiveness of low-level laser therapy in the rehabilitation of knee meniscus injuries: a randomized, double-blind, placebo-controlled trial. RCT, n = 40 Human: 40 participants
2026 Efficacy of high-intensity laser therapy versus ultrasound therapy in patients with knee osteoarthritis: a randomized controlled trial RCT, n = 66 Human: Comparison study, randomized, double-blind; 66 participants
2026 Photodynamic Therapy and Photobiomodulation in the Treatment of Osteonecrosis: A Series of Cases. Case report Human
2026 Effect of local and vascular photobiomodulation on the success of autogenous bone grafts in the alveolar ridge of patients with cleft lip and palate Human study, n = 87 Human: 87 participants
2026 Effect of photobiomodulation on fatigue-related errors in ankle joint position reproduction: the moderating role of perceived ankle instability in a randomized, placebo-controlled trial RCT, n = 30 Human: Randomized trial, sham-controlled; 30 participants
2026 Effect of High-Intensity Laser Therapy on Disc Size and Functional Outcome in Patients with Lumbar Disc Herniation RCT, n = 40 Human: Randomized trial, sham-controlled; 40 participants
2026 Comparison of the efficacy of high-intensity laser therapy and low-level laser therapy in carpal tunnel syndrome: A randomized-controlled study RCT, n = 63 Human: Randomized trial; 63 participants
2026 From surgical debridement to laser-guided bone repair: An integrative approach to mandibular osteomyelitis. Case report Human
2026 Intraoperative Intramedullary Photobiomodulation Therapy for Consolidation of Atypical Femoral Fractures in Elderly Women: A Pilot Study RCT, n = 11 Human (elderly women): Randomized trial; 11 participants
2026 Photobiomodulation Therapy Modulates Inflammatory and Cartilage Biomarkers in Patients with Knee Osteoarthritis: A Pilot Case Series RCT, n = 20 Human: 20 cases; case series (secondary publication)
2026 Comparative effectiveness of laser, PRP, splinting, and ESWT versus corticosteroid injection in lateral epicondylitis: a randomized controlled trial RCT, n = 98 Human: 98 participants; comparison study; 3-month study
2025 Successful Rehabilitation and Release of a Bald Eagle (Haliaeetus leucocephalus) After Arthrodesis of a Metacarpophalangeal Joint Luxation. Case report Human
2025 The effects of low-level laser therapy in extensor tendon injuries between zones 5 and 8 of the hand: A double-blind, randomized, placebo-controlled study RCT, n = 55 Human: 55 participants; randomized trial, double-blind
2025 Effects of photobiomodulation therapy combined with static magnetic field on pain and function in patients with lateral epicondylitis: a multicentre, randomised, placebo-controlled trial RCT, n = 50 Human: 50 participants; randomized trial, sham-controlled; 3 weeks
2025 Comparison of the effects of high-intensity laser therapy and low-level laser therapy in knee osteoarthritis RCT, n = 90 Human: 90 participants; comparison study, randomized; 2-week treatment / 6-week study
2025 Effect of laser acupuncture on pain, range of motion, and function in patellofemoral pain syndrome: a randomised controlled trial. RCT Human
2025 Management protocol for early postoperative avian wing fractures. Human study Human
2025 Effect Of Photobiomodulation (Low-Level Laser Therapy) In Patients With Knee Osteoarthritis: A Randomized Controlled Trial RCT, n = 73 Human: 73 participants (65 completed); randomized trial, sham-controlled
2025 The effects of laser therapy on pain, functionality and biomechanical parameters in patients suffering from gonarthrosis: an observational study Single-arm study, n = 12 Human: 12 participants; single-arm trial; 3-week treatment / 22-day study
2025 Efficacy of Combined High-Intensity Laser Therapy and Collagenase Chemonucleolysis in Lumbar Disc Herniation Management: a Prospective Randomized Controlled Trial RCT, n = 60 Human: 60 participants; randomized trial; 5-day treatment -> 6-month follow-up
2025 Additional effect of high-intensity laser therapy with conventional physiotherapy related to pain and function in patients with knee osteoarthritis: a randomized, double-blind, placebo-controlled, 12-week follow-up study RCT, n = 31 Human: 31 participants (43 knees); randomized trial, double-blind
2025 Autofluorescence-Guided Surgery in the Management of Osteonecrosis of the Jaw: Correlation Between Bone Autofluorescence and Histopathological Findings in 56 Samples. Human study, n = 22 Human: 22 participants
2025 Effect of Vascular Photobiomodulation in the Postoperative Period of Alveolar Bone Grafting RCT, n = 42 Human: 42 participants; randomized trial; single treatment -> 24-hour follow-up

Light parameters used in the trials

Wavelengths reported in our database for the 166 human randomized trials in this category (40 wavelength entries; many database records lack a wavelength, and some trials report more than one). This describes the research; it is not a dosing recommendation.

Wavelength bandTimes used in trials
Near-infrared (800-899 nm)15
Red (600-699 nm)9
Near-infrared (900-1200 nm)8
Blue/green (400-599 nm)5
Deep red/near-infrared (700-799 nm)3

Most common wavelengths: 630-639 nm, 1060-1069 nm, 780-789 nm, 800-809 nm, 480-489 nm.

What the evidence does not show

  • Pain relief in rheumatoid arthritis: no difference from placebo across 22 studies (Salajegheh 2024, PMID 39574241).
  • Pain or grip strength benefit in carpal tunnel syndrome: not significant in pooled data, although function improved (Lauxen 2025, PMID 39776290).
  • Faster bone healing or long-term benefit after fractures: no differences at 4 to 26 weeks (Wang 2026, PMID 42080480).
  • That light beats other treatments for tendinopathy on its own: pain changes were similar to other interventions (Tripodi 2021, PMID 34391447).
  • Strong certainty for knee osteoarthritis: certainty was rated very low, so authors advise using it alongside recommended therapies (Oliveira 2024, PMID 38775202).

Frequently asked questions

Does red light therapy help knee arthritis?

It reduces knee pain in trials. A 2024 meta-analysis found less pain at rest than placebo (very low certainty) (Oliveira 2024), and a 2025 network meta-analysis ranked low-level laser first among physical treatments for knee pain (Lan 2025).

Does it help tendon pain?

Combined with exercise, it reduced pain and improved function more than sham plus exercise in 17 trials (Tripodi 2021).

Does it help carpal tunnel syndrome?

A 2025 meta-analysis of 13 trials found better hand function but no significant improvement in pain or grip strength (Lauxen 2025).

Does it speed up bone healing?

Not in current trials. After fractures, light reduced short-term pain but bone healing did not differ from placebo (Wang 2026).

Browse All Joints, Tendons & Orthopedics Studies

All 952 studies in this category from our study database, built on the PBM Research Database by Vladimir Heiskanen.

Search every study across all categories: Open the Full Evidence Explorer →

Methodology & important context

The published research indexed and referenced on this page studies photobiomodulation (PBM) as a therapeutic modality and the specific wavelengths used in those studies — not Mito Red Light devices specifically. The wavelengths used across our panels were chosen because the peer-reviewed PBM literature supports them: this is where published evidence is deepest, where dosing parameters have been characterized in human studies, and where clinical guidelines (such as WALT for inflammation and pain) exist. Mito Red Light has not funded or conducted registered clinical trials on our specific devices, and the study counts referenced here reflect the broader PBM research base — not studies of our products.

Where review authors graded certainty (for example with GRADE), we report their grade; other ratings are Mito’s summary. Study counts reflect peer-reviewed photobiomodulation research drawn from major scientific literature databases, peer-reviewed journals, and other published research repositories. PBM response varies meaningfully by person, tissue, condition, dose, wavelength, and session timing; outcomes reported in the published literature may not be replicable for every user. Mito Red Light devices are not intended to diagnose, treat, cure, or prevent any disease. If you have a medical condition or are under a physician’s care, please consult your healthcare provider before beginning any photobiomodulation regimen.