Knee pain while walking, climbing stairs, standing up from a chair, or spending a long time on your feet is common among people with knee osteoarthritis. When pain starts to limit daily activities, many people ask what options may be available besides medication or surgery.

High-intensity laser therapy (HILT) has been studied as a possible part of conservative care. What does the evidence show—and what should a patient realistically expect?

What happens in a knee with osteoarthritis?

Osteoarthritis is a joint disease associated with progressive changes in structures such as cartilage and the bone beneath it. Symptoms can include pain with movement, stiffness, difficulty walking or climbing stairs, reduced mobility, muscle weakness, and limits on everyday activities.

Symptoms vary considerably from person to person. Treatment decisions should not rely on an X-ray alone; pain, mobility, function, and each person’s needs also matter.

Does knee osteoarthritis always require surgery?

No. Care depends on disease severity, symptoms, and the individual. When conservative treatment is appropriate, exercise and muscle strengthening can play an important role. Medication and physical therapy modalities may also be considered to manage symptoms.

HILT is one technology studied in this setting. For an overview of the proposed mechanisms and their limitations, read how high-intensity laser therapy works.

What is high-intensity laser therapy?

HILT applies light energy to a selected area. The technology uses higher power than low-level laser systems and is designed to deliver energy to tissue in a controlled way. Research in musculoskeletal conditions has mainly examined possible changes in pain and physical function.

What have knee osteoarthritis studies found?

Two clinical trials illustrate both the potential findings and the limits of the available evidence.

HILT plus exercise compared with low-level laser plus exercise

Kheshie, Alayat, and Ali conducted a randomized clinical study involving 53 people with knee osteoarthritis. Participants were assigned to high-intensity laser plus exercise, low-level laser plus exercise, or placebo laser plus exercise.

The researchers assessed pain and knee function with the WOMAC index, which measures pain, stiffness, and difficulty with activities. After six weeks, the laser groups combined with exercise showed improvements. In this trial, the high-intensity laser plus exercise group had better results than the low-level laser plus exercise group; both performed better than the placebo-laser-plus-exercise group.

An important point is that HILT was not studied as a replacement for movement or exercise. It was assessed as part of a combined program.

HILT plus exercise compared with placebo laser plus exercise

Akaltun and colleagues conducted a randomized, double-blind, placebo-controlled trial involving 40 people with knee osteoarthritis. Participants received either high-intensity laser plus exercise or placebo laser plus exercise. Treatment lasted two weeks, and participants were reassessed at week six.

Both groups improved, again highlighting the role of exercise. At the six-week assessment, the HILT-plus-exercise group had lower pain scores and better functional results than the group that received exercise with placebo laser. The study also reported changes in knee range of motion.

Can HILT help with knee pain?

These studies suggest that HILT may help reduce pain and improve function in some people with knee osteoarthritis, particularly when used alongside exercise. They do not show that everyone will respond the same way, that HILT replaces other care, or that it cures osteoarthritis.

The goals of conservative care are usually to reduce symptoms, improve mobility, and help a person carry out activities with fewer limitations.

Can laser therapy regrow cartilage?

That is a different claim. Akaltun and colleagues used ultrasound measurements of femoral cartilage and reported statistically significant changes in the HILT group. Those findings alone do not establish that laser therapy regenerates cartilage or reverses osteoarthritis.

More research and longer follow-up are needed to understand the clinical meaning of those measurements. Pain, function, and mobility are more appropriate outcomes to discuss based on these trials.

How many sessions are needed?

There is no universal number of sessions for everyone. Research protocols differ in power, energy, number of sessions, and treatment duration. Akaltun and colleagues, for example, delivered 10 sessions over two weeks, while other studies have used different schedules.

The number of sessions should not be determined from a label such as “arthritis” alone. Pain severity, how long symptoms have been present, mobility, activities that provoke symptoms, and a person’s response to care all matter.

Does HILT replace exercise or rehabilitation?

No. The studies summarized here used HILT alongside exercise. Laser therapy should not be presented as a substitute for rehabilitation, strengthening, or a clinician’s treatment plan. A qualified professional can assess whether it might be a suitable complement in an individual case.

When should knee pain be assessed?

Consider a medical assessment when pain persists, worsens, limits walking or daily activities, or is accompanied by significant swelling, instability, or difficulty bearing weight. An evaluation can help identify the cause and determine which options are appropriate.

The takeaway

Clinical studies provide a reason to continue researching HILT as an adjunct for selected people with knee osteoarthritis, especially alongside exercise. They do not support promising a cure or cartilage regeneration, or assuming the treatment will work for everyone.

The best next step is an individual assessment and a plan based on diagnosis, symptoms, and goals.

Scientific references

Suggested next step: Request an assessment if you would like to discuss your case.