Knee Osteoarthritis Explained: What Actually Works, and What the Trials Found

Knee osteoarthritis is the most common reason people in India ask us about cannabis for pain, and it is the condition where we have to give the least encouraging answer. We would rather say that here, clearly, than have you find out after buying something.

Kushiva makes cannabis leaf extract under India’s AYUSH framework. Whether it suits you is a question for your doctor.See the range

This article is entirely about the arthritic knee - what is actually happening inside the joint, why it hurts going down stairs more than up, why the single most effective treatment is the one that sounds most wrong, and what the controlled trials of cannabidiol in osteoarthritis actually found.

This article is educational and is not medical advice. Vijaya (cannabis leaf extract) is a prescription-regulated ingredient in India and should only be used under the guidance of a registered medical practitioner. A knee that is hot, visibly swollen, red, or painful with fever needs prompt medical assessment - that is not osteoarthritis.

Key Takeaways

• Osteoarthritis is an active disease of the whole joint, not simply cartilage wearing out with age.
• Cartilage itself has no nerve supply. The pain comes from bone, lining and surrounding tissue - which is why X-ray damage and pain levels often do not match.
• Pooled Indian data puts knee osteoarthritis near 47% among elderly people, and about 35% among rural adults over 40.
• Two randomised placebo-controlled trials of CBD in osteoarthritis found no significant benefit over placebo. In one, pain fell 2.5 points on CBD and 2.4 on placebo.
• Exercise and weight reduction have far stronger evidence than anything sold for knees, including ours.

Quick Answer

The controlled evidence for cannabidiol in osteoarthritis is negative. Two randomised, double-blind, placebo-controlled trials found it performed no better than a dummy pill for arthritis pain. Many people report feeling better, and that is worth taking seriously as an experience, but it has not survived the test designed to separate a real drug effect from expectation. If your knees are the problem, the interventions with the strongest evidence are exercise and weight reduction, and they are free.

What is actually happening inside the joint

At the end of each bone in your knee sits a layer of cartilage: smooth, slippery, and about as thick as a coin. Its job is to let the surfaces glide over one another almost frictionlessly and to spread load. It works remarkably well, and it has one serious design limitation - it has no blood supply of its own. It is fed by joint fluid being squeezed in and out as you move. This matters later.

Osteoarthritis is usually described as this cartilage wearing away with age. That description is incomplete enough to be misleading, and it leads people to the wrong conclusions.

What actually happens is that the whole joint becomes involved in an active process. The cartilage surface roughens and thins. The bone underneath responds by thickening and by growing small spurs at the edges. The joint lining becomes inflamed in episodes, producing swelling and fluid. The ligaments and the muscles around the joint weaken and stop supporting it properly. It is a joint-wide disease with a repair process that has gone wrong, not simply a worn-out part.

That distinction has a practical consequence. A worn part only gets worse. A disease process with an inflammatory component and a muscular component has things you can actually influence.

Why an X-ray often does not match how you feel

This confuses almost everyone, including people whose scans look alarming and whose knees feel fine.

Cartilage contains no nerve endings. You cannot feel cartilage, and you cannot feel it thinning. So where is the pain coming from?

From everything around it. The bone underneath, which is richly supplied with nerves and becomes stressed once cartilage stops cushioning it. The joint lining, when inflamed. The capsule around the joint, when it is stretched by swelling. The tendons and muscles that are being asked to compensate.

Because pain comes from those structures rather than the cartilage, X-ray severity and symptom severity are only loosely related. People with dramatic-looking X-rays sometimes walk comfortably. People with modest changes are sometimes in serious pain. If a doctor has told you your scan is not as bad as your symptoms, they were not dismissing you.

Why stairs, and why the first steps

The specific patterns people describe all have straightforward explanations.

• Going down is worse than going up. Descending, your thigh muscle works while lengthening to control your body against gravity, and the load passing through the kneecap joint is far higher than when climbing. Most people assume up should be harder because it feels like more effort.
• The first few steps after sitting are the worst. While still, joint fluid thickens and inflammatory material settles. Movement redistributes it. This is why the stiffness eases within a few minutes.
• Morning stiffness lasts under thirty minutes. This is a useful distinction. Stiffness lasting well over an hour, especially with several swollen joints on both sides and hands involved, points towards inflammatory arthritis such as rheumatoid arthritis, which is a different disease needing different and more urgent treatment.
• The grinding sound. Roughened surfaces passing over each other. Alarming, and on its own not a sign of severity.
• It hurts more in cold or damp weather. Reported consistently for generations and still not fully explained. Your experience is not imaginary even though the mechanism is unsettled.

How common it is in India, and why

Very common. A meta-analysis of community-based Indian studies put pooled prevalence among elderly people at about 47% (Indian Journal of Orthopaedics, 2025), and a community study in rural South India found knee osteoarthritis in about 34.6% of adults aged 40 and above (Cureus, 2024). Rates are consistently higher in women and in rural populations.

Several factors specific to daily life here contribute. Deep squatting and sitting cross-legged on the floor, for eating, cooking, praying and using Indian-style toilets, put the knee through a far greater range of loaded flexion than chair-based living. Occupational kneeling and squatting are common. Rising rates of obesity add mechanical load. Vitamin D deficiency is widespread. And knee replacement, where it is eventually needed, is often delayed for cost reasons, meaning people manage symptoms for longer.

What actually works

The ranking here surprises people, because the strongest intervention is the one they have been avoiding.

Exercise is first, and it is not close. Strengthening the thigh muscles, particularly the quadriceps, gives the joint better support and reliably reduces pain. The instinct to rest a painful knee is understandable and counterproductive - resting weakens the muscles that protect the joint, and remember that cartilage is fed by movement squeezing fluid through it. A knee that is not moved is a knee that is not being fed.

Weight reduction is second, and the leverage is larger than people expect. Because of how force multiplies through the knee during walking, each kilogram lost removes several kilograms of load from the joint with every step. Modest weight loss produces disproportionate symptom improvement.

After that: physiotherapy for technique and for correcting how you walk; simple pain relief used sparingly; adapting the deep-squatting activities that provoke it most, such as switching to a raised toilet seat and a chair for meals; and in advanced cases, joint replacement, which is a genuinely effective operation.

What the trials of cannabidiol in osteoarthritis found

Unusually, this question has been tested properly, and we are going to report the answer rather than talk around it.

In a randomised, double-blind, placebo-controlled trial, patients with hand osteoarthritis or psoriatic arthritis who still had moderate pain despite treatment received either synthetic CBD at 20 to 30 mg daily or a placebo, for twelve weeks. No significant effect on pain intensity was found (Pain, 2022).

A separate randomised, double-blind, placebo-controlled trial tested oral CBD added to paracetamol in painful chronic knee osteoarthritis. Pain on the WOMAC scale fell by 2.5 points in the CBD group and 2.4 points in the placebo group - a difference of one tenth of a point, with no statistical significance (The Lancet Regional Health – Europe, 2023).

Look at those placebo numbers again, because they are the most instructive part. People taking a dummy capsule improved by 2.4 points. That is a real improvement that people genuinely felt. It is simply not attributable to the drug. This is precisely why testimonials about arthritis supplements are so abundant and so unreliable - large improvement happens on placebo, and everyone experiencing it is telling the truth about how they feel.

Two caveats, offered for accuracy rather than rescue. These trials used CBD alone, not full-spectrum extract containing THC, and the doses were modest. It remains possible that a different preparation performs differently. But that is a hypothesis, and what exists today is two well-designed negative results.

What we would actually suggest

• Start with a physiotherapist, not a product. A supervised quadriceps programme has better evidence than anything you can buy, including from us.
• If you are carrying extra weight, that is the biggest lever available to you, and it works through simple mechanics.
• Change the provoking activities. A raised toilet seat and eating at a table are unglamorous and effective.
• Get the diagnosis confirmed if stiffness lasts over an hour or several joints are involved on both sides. Inflammatory arthritis is treated completely differently and treating it early matters.
• If you still want to try Vijaya, do it with realistic expectations and with a doctor - and judge it against how you were, not against what you hoped.

We sell cannabis leaf extract, so it would be easy to write this differently. But an arthritic knee responds to strength, load and time, and there is no version of this where a bottle outperforms a physiotherapist. You are better served knowing that.

We would rather point you at a physiotherapist than sell you something the trials do not support. If you still want to discuss Vijaya with a doctor, every Kushiva order goes through a prescription and medical-review step before dispatch, and you can see the lab-tested range here.

If you and your doctor still want to trial it despite the evidence above, the 10 ml oil is the smallest commitment, and the 30 ml oil only makes sense once something has actually been shown to help you. Judge it against a written baseline.