PRP and Hyaluronic Acid Injections for Knee Arthritis: Does Combining Them Work Better?
- 6 days ago
- 4 min read
Written by Dr. Jeffrey Peng, MD — Board-Certified Sports Medicine Physician
Published: March 2, 2026 | Last Updated: March 2, 2026
If you are considering a PRP injection for knee arthritis, you may have come across the option to add hyaluronic acid (HA) to the treatment. It is a reasonable question: does combining PRP and hyaluronic acid actually produce better outcomes, or is it simply an expensive add-on with no meaningful benefit? The answer could influence your treatment decision, what you pay out of pocket, and ultimately how well your knee responds over time.
In my practice, I help patients navigate PRP and other orthobiologic treatments on a regular basis, and this is one of the most common questions I encounter. The evidence surrounding PRP combined with hyaluronic acid is more nuanced than most people realize. In this article, I review the latest clinical research comparing PRP alone to PRP combined with hyaluronic acid, and break down what the science actually says about outcomes, cost-effectiveness, and long-term joint relief.
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What Does the Long-Term Research Show About PRP Combined with Hyaluronic Acid?
A landmark 2025 network meta-analysis published in the Journal of Orthopaedic Surgery and Research provides some of the most comprehensive long-term data available on this topic. Gupta et al., 2025 pooled data from 37 randomized controlled trials involving over 5,000 patients with knee osteoarthritis. All patients received intra-articular injections — including PRP, hyaluronic acid, corticosteroids, or combinations of these — with at least one year of follow-up. That extended follow-up period is particularly important, because the majority of injection studies only track patients for three to six months.
The findings were striking. The combination of PRP and hyaluronic acid was ranked as the most effective treatment for both pain relief and functional improvement at one year. PRP alone came in second, followed by the combination of hyaluronic acid with corticosteroids, hyaluronic acid alone, placebo, and finally corticosteroids by themselves. These rankings suggest a possible synergistic effect between PRP and HA, making the combination especially compelling for patients seeking sustained relief without surgery.
How Do Results Compare at Different Time Points?
The picture becomes more nuanced when examining shorter-term outcomes. A separate 2023 network meta-analysis published in BMC Musculoskeletal Disorders examined 35 randomized trials involving over 3,100 patients (Qiao et al., 2023). This study also compared PRP, hyaluronic acid, corticosteroids, and their combinations — but included data from three-, six-, and twelve-month follow-ups, offering a clearer view of how these treatments perform over time.
At three months, PRP alone produced the best outcomes for improving joint function as measured by WOMAC scores. However, when it came to pain relief, the combination of PRP and hyaluronic acid slightly edged out PRP alone — especially at the six- and twelve-month marks. For example, at twelve months, the PRP plus HA combination had the highest ranking for pain reduction on the VAS scale, with a SUCRA score of 85.5, compared to 63.7 for PRP alone.
Should You Combine PRP and Hyaluronic Acid for Your Knee?
The debate on PRP combined with hyaluronic acid versus PRP alone is far from settled, and conclusions vary depending on which studies you examine and when they were published. Here is my clinical perspective: if hyaluronic acid is covered by your insurance — or if the additional cost is not a concern — then combining it with PRP may provide a modest extra benefit, particularly for longer-term pain relief. However, if you are paying out of pocket and cost is an important factor, PRP alone remains an excellent choice. The long-term improvements without the added hyaluronic acid are still substantial, and you are not missing out on a dramatic difference in outcomes by skipping the HA.
It is also worth noting that both studies found no major safety concerns with any of the treatments analyzed. PRP, hyaluronic acid, and the combination were all well tolerated with low rates of adverse events. This is reassuring for patients weighing their options, because the risk profile of these injections remains favorable regardless of which approach you choose.
In my practice, I often recommend that patients consider their individual circumstances — including insurance coverage, severity of arthritis, and prior treatment history — when deciding between PRP alone and the PRP plus HA combination. Both are evidence-based approaches, and the most important factor is ensuring that the injection is performed by an experienced provider using proper technique, ideally with ultrasound guidance for accurate placement.
If you are interested in learning more about PRP injections and whether you may be a candidate, visit our PRP injection page for detailed information about the procedure, preparation, and what to expect during recovery.
References
1. Gupta N, Khatri K, Lakhani A, Dahuja A, Randhawa A, Bansal V, Bansal K. Long-term effectiveness of intra-articular injectables in patients with knee osteoarthritis: a systematic review and Bayesian network meta-analysis. J Orthop Surg Res. 2025;20(1):227. doi:10.1186/s13018-025-05574-w
2. Qiao X, Yan L, Feng Y, Li X, Zhang K, Lv Z, Xu C, Zhao S, Liu F, Yang X, Tian Z. Efficacy and safety of corticosteroids, hyaluronic acid, and PRP and combination therapy for knee osteoarthritis: a systematic review and network meta-analysis. BMC Musculoskelet Disord. 2023;24(1):926. doi:10.1186/s12891-023-06925-6
Disclaimer: The content of this blog post is intended for educational and informational purposes only. It does not constitute medical advice and should not be used as a substitute for professional medical evaluation, diagnosis, or treatment. Always consult with a qualified healthcare provider before starting any new treatment or making changes to your existing care plan. Dr. Jeffrey Peng and jeffreypengmd.com do not assume liability for any actions taken based on the information provided in this article.
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