Low-level laser therapy for knee pain and knee joint degeneration
Knee pain is one of the most common musculoskeletal complaints today. If you are among those who have trouble getting moving in the morning, wince when climbing stairs, or experience pain after a longer walk, you should know: there is a solution. Low-level laser therapy is a side-effect-free method that can be used at home and may support the healing process.
Why does your knee hurt?
There are many possible causes of knee pain:
Osteoarthritis (cartilage wear)
The knee is one of the most heavily loaded joints in the body. Over the years the joint cartilage gradually wears and thins – this is osteoarthritis. Exposed bone surfaces rub against each other, causing pain and inflammation.
Joint inflammation (arthritis)
Rheumatoid arthritis, gout or other inflammatory diseases can also cause knee pain. In these cases the cause is not wear but immune system or metabolic problems.
Injuries
Meniscus injury, ligament tear, cartilage surface damage – due to the knee's complex structure many different components can be injured.
Postoperative state
After knee replacement surgery or other knee operations, rehabilitation focuses on reducing pain and restoring function.
How can low-level laser help with knee pain?
Low-level laser therapy (LLLT) can exert beneficial effects through several mechanisms:
- It can positively influence inflammatory processes
- It may contribute to a reduction in pain sensation
- It can support tissue regeneration
- It can improve local blood circulation
What does the science say?
The application of low-level laser to knee osteoarthritis has been examined in numerous studies. A 2019 meta-analysis found that low-level laser treatment applied at the appropriate dose produced better results than placebo in pain reduction for knee osteoarthritis.1
An earlier systematic review analyzed 14 randomized controlled trials and concluded that low-level laser may favorably affect resting and movement-related pain as well as joint function in knee osteoarthritis.2
It is important to note that study results are not unanimous – some trials found no significant difference between placebo and active treatment. Efficacy depends on treatment parameters, disease stage and individual factors.
Treatment points for knee pain
The knee should be treated from several points for the best result:
- Front of the knee: around, below and above the kneecap
- Sides of the knee: in the medial and lateral joint spaces
- Back of the knee: in the popliteal fossa
Treatment technique
- Sit comfortably with your leg relaxed, either extended or slightly bent
- Place the device directly on the skin – it does not work through clothing!
- Start with one treatment point and hold it still for the set time
- Move to the next point until all areas are covered
- Treat both knees if both are affected
Treatment parameters
| Parameter | Value |
|---|---|
| Wavelength | 808 nm |
| Energy per point | 5–7 Joules |
| Treatment time per point | 5–8 minutes (depending on the device) |
| Number of treatment points | 3–4 points per knee |
Treatment frequency
- Acute pain, inflammation: 2–3 times daily
- Chronic osteoarthritis: 1–2 times daily
Regular treatment is usually required for 10–14 days to observe beneficial effects.
Before you start treatment
When NOT to use it?
- If you have an implanted pacemaker
- If you have an active malignant tumor in the treatment area
- If there is an active infection in the knee
- If you take photosensitizing medication
Detailed information on contraindications: Contraindications of low-level laser therapy
When should you see a doctor?
- If the knee is significantly swollen, warm, or red
- If you cannot put weight on the leg
- If the knee "locks" or becomes unstable
- If fever accompanies the symptoms
Complementary therapies
Besides low-level laser, other methods can also help:
- Muscle strengthening: A muscle stimulator can help strengthen the thigh muscles
- Magnet therapy: May positively influence inflammation
- TENS: Can help reduce pain perception
Recommended devices
| Device | Advantage |
|---|---|
| B-Cure Laser Pro | Moderate power, longer treatment time |
| Personal Laser L400 | Affordable price |
| Energy Laser L500 Pro | Higher output |
The full range of low-level laser devices can be found here.
Other applications of low-level laser
Low-level laser therapy can support the treatment of many other conditions and complaints. For an overview of all home applications read the Low-level laser therapy at home – Treatable conditions article.
If you are not familiar with the basics of low-level laser therapy, start with the Comprehensive guide to low-level laser therapy article.
Summary – Quick overview
What is this article? A guide to applying low-level laser therapy for knee pain and knee osteoarthritis.
Who is it for? People with knee osteoarthritis, joint inflammation, those recovering from knee injury or surgery.
Main message: Research suggests low-level laser therapy may positively affect knee pain. Perform treatment regularly from multiple points.
Frequently asked questions:
Does low-level laser restore worn cartilage?
No, low-level laser does not rebuild cartilage tissue. However, it may favorably influence inflammation and pain.
Can I use it with a knee prosthesis?
Generally yes, but consult your treating physician.
Related musculoskeletal articles
- Low-level laser for treating joint inflammation (arthritis) – if inflammation is behind the knee pain
- Low-level laser for heel pain – heel spur, plantar fasciitis
- Low-level laser for tendon inflammation – tennis elbow, Achilles tendon problems
- Low-level laser for herniated disc and back pain – if you experience radiating pain
- Treating sports injuries with low-level laser – regeneration for athletes
Sources
- Stausholm MB, et al. (2019). Efficacy of low-level laser therapy on pain and disability in knee osteoarthritis: systematic review and meta-analysis. BMJ Open. PubMed: 31662383
- Rayegani SM, et al. (2017). Safety and Effectiveness of Low-Level Laser Therapy in Patients With Knee Osteoarthritis. J Lasers Med Sci. PubMed: 29071029
The information in this article is for guidance only. Home therapeutic devices are intended to complement medical treatment and do not replace specialist care. Consult your doctor in case of complaints.
