Top Scientific Treatments for Knee Osteoarthritis: What Really Works?

A knee brace being worn during aquatic therapy or low-impact exercise, highlighting non-invasive treatment for osteoarthritis

If you're battling knee pain or stiffness, you're not alone. A recent study published in PLOS One (June 18, 2025) analyzed data from 139 randomized clinical trials involving nearly 10,000 patients with knee osteoarthritis to rank the most effective non-drug interventions.

Most Effective Interventions (Ranked)

Knee brace – Topped the charts for reducing pain, stiffness, and improving joint function across multiple scales (WOMAC and VAS) .
Aquatic therapy (hydrotherapy) – Ranked #2 overall; especially effective in reducing pain by harnessing hydrostatic pressure and buoyancy .
Exercise therapy – Low-impact workouts (e.g., weightlifting, yoga) consistently reduced pain and enhanced mobility .

Why These Work

Knee braces help redistribute joint load, improve biomechanics and stability, alleviate muscle fatigue, and reduce inflammation. However, user comfort and compliance can be an issue.
Hydrotherapy involves war-water exercise (33–35 °C) that diminishes joint pressure and enhances range of motion—often leading to significant pain relief.
Exercise routines (aerobic, strength, flexibility) are critical: “It doesn’t matter what type—just stay active,” per biomechanics expert Steve Messier .

Risk Factors & Preventative Tips

Knee cartilage deterioration often leads to “bone-on-bone” joint contact, and cartilage can't regenerate naturally. Key risk factors include:

History of knee injuries, such as ACL tears.
Excess body weight — each pound adds ~4 lbs of stress on the knee during walking.

Experts emphasize that maintaining physical activity and a healthy weight is fundamental to managing symptoms and slowing disease progression .

Medication & Surgical Options

NSAIDs (e.g., ibuprofen) are common for short-term pain relief, but long-term use may harm the gut lining. Recommended use is limited to ~10 days during high pain episodes .
Knee replacement surgery remains the definitive option for advanced osteoarthritis, though recovery can last up to a year. Decision is based on symptoms, not imaging alone .

Bottom Line

Based on current evidence:

Begin with non-invasive, low-risk treatments like knee braces, hydrotherapy, and exercise.
Limit NSAID usage and monitor for side effects.
Reserve surgery for severe cases with significant symptoms.

References and further reading

Chen X, Fan Y, Tu H, Luo Y et al. "Clinical efficacy of different therapeutic options for knee osteoarthritis: A network meta-analysis based on randomized clinical trials." PLOS One. June 18, 2025. Link to full study.
Belluck P. "Have knee pain? Here's what really works, according to science." The Washington Post. June 18, 2025. Read the article.