Living with knee osteoarthritis (OA) can be challenging, especially with persistent pain and stiffness that can make daily activities difficult. At Great Northern Physiotherapy, we understand that many people with OA are looking for effective ways to manage symptoms without relying solely on painkillers. In recent years, one option that has gained attention is intra-articular hyaluronic acid (IAHA) injections. Let’s dive into what IAHA is, how it works, and what current research says about its effectiveness in managing knee OA.
What is Hyaluronic Acid, and How Does it Work in the Joint?
Hyaluronic acid (HA) is a natural substance found in our joint fluid, where it acts as a lubricant and shock absorber. Its unique gel-like consistency helps cushion and protect the joint surfaces from wear and tear. In healthy joints, HA molecules are of high molecular weight, meaning they’re thick and durable, providing ideal support for the knee (Maheu et al., 2019).
However, in people with OA, the natural HA in the joint breaks down, becoming less effective. This leads to less cushioning, increased friction, and more pain. To combat this, intra-articular hyaluronic acid injections have been developed. These injections aim to replenish the lost HA, providing the joint with some of the support it’s missing.
How Effective is IAHA for Knee Osteoarthritis?
IAHA injections have been widely studied to see how well they reduce knee pain and improve function in people with OA. Research suggests that IAHA can provide moderate pain relief and may even delay the need for knee replacement surgery. For instance, studies show that IAHA injections can reduce pain more effectively than oral painkillers and offer longer-lasting relief than corticosteroid injections in some cases (Maheu et al., 2019).
One study found that IAHA can be particularly helpful about 4-8 weeks after injection, with effects that may last up to 24 weeks. The injection doesn’t just add lubrication but also stimulates the body’s own HA production, providing more long-term support (Bannuru et al., 2015).
How IAHA Stacks Up Against Other Treatments
Compared to common OA treatments, IAHA injections stand out in a few ways:
- Safety Profile: IAHA is generally well-tolerated and has fewer side effects than oral nonsteroidal anti-inflammatory drugs (NSAIDs) or opioids. This makes it a good option for people who may be sensitive to these medications or have other health conditions that make oral pain relief challenging.
- Pain Relief and Function Improvement: IAHA’s effects tend to build over several weeks, which can be especially useful for people needing relief to continue physical therapy or other activities. Research shows that IAHA performs similarly to NSAIDs in pain reduction, but with a much lower risk of gastrointestinal or cardiovascular side effects (Maheu et al., 2019).
- Comparisons with Corticosteroids: While corticosteroids are commonly used for short-term pain relief in OA, they may not provide the same extended benefits as IAHA. Studies show that IAHA has longer-lasting effects and may help preserve the joint structure better than repeated corticosteroid injections (Bannuru et al., 2014).
Considerations and Limitations of IAHA
Despite the positive results, it’s essential to consider a few points. The benefits of IAHA can vary depending on individual factors, such as the stage of OA and overall joint health. Some studies have shown that people with moderate OA tend to benefit more from IAHA than those with severe joint damage. This means that timing the treatment based on OA progression is essential.
Additionally, while IAHA is generally safe, some patients experience mild side effects like temporary joint swelling or discomfort. However, these side effects are usually short-lived and resolve without additional treatment.
Who Might Benefit Most from IAHA Injections?
IAHA injections may be beneficial for people with mild to moderate knee OA who have not found adequate relief from other treatments, such as physical therapy, NSAIDs, or topical treatments. It’s especially suitable for those seeking an option that may delay surgery and provide sustained pain relief without the risks associated with long-term medication use.
At Great Northern Physiotherapy, we support a holistic approach to managing OA. IAHA injections can be a valuable addition to a treatment plan that includes physical therapy, strength training, and lifestyle modifications like weight management. Combining these approaches can provide well-rounded support for knee health, helping patients stay active and pain-free.
To Summarise…
Intra-articular hyaluronic acid injections offer a promising option for knee OA management, particularly for those with moderate OA who are looking for long-lasting relief. Although not a cure, IAHA can play a significant role in reducing pain, improving joint function, and potentially delaying the need for surgery.
If you’re interested in learning more about IAHA or other knee OA treatments, we invite you to consult with our team at Great Northern Physiotherapy to discuss the best options tailored to your needs.
Check out our Compass Clinic! Book a free 15-minute online consultation:
References
Bannuru, R.R., Schmid, C.H., Kent, D.M., Vaysbrot, E.E., Wong, J.B. and McAlindon, T.E., 2015. Comparative effectiveness of pharmacologic interventions for knee osteoarthritis: A systematic review and network meta-analysis. Annals of Internal Medicine, 162(1), pp.46-54.
Maheu, E., Bannuru, R.R., Herrero-Beaumont, G., Allali, F., Bard, H., and Migliore, A., 2019. Why we should definitely include intra-articular hyaluronic acid as a therapeutic option in the management of knee osteoarthritis: Results of an extensive critical literature review. Seminars in Arthritis and Rheumatism, 48(3), pp.563-572.
