Introduction
Knee osteoarthritis can cause recurring pain and stiffness that affect walking, exercise and everyday movement. When lifestyle changes, physiotherapy or simple pain relief are not enough, a doctor may consider treatments such as a hyaluronic acid injection to help manage symptoms.
At PhilosMed Marketing Sdn Bhd, Hyruan ONE and Hyruan PLUS are hyaluronic acid treatments used for osteoarthritis. How often an injection can be taken depends on the product, how long symptom relief lasts and the doctor’s assessment of the individual patient.
Summary
There is no single injection schedule that applies to every patient or HA product. Hyruan ONE is given as a single injection and PhilosMed states that repeat treatment may be considered when needed, potentially as frequently as every three months. Other clinical guidance commonly describes repeating successful HA treatment at around six months.
- HA injection schedules vary according to the specific product used.
- Hyruan ONE requires one injection per treatment course.
- Hyruan PLUS involves three weekly injections per treatment course.
- Repeat treatment depends on symptom relief and individual clinical assessment.
- A doctor should determine when another treatment course is appropriate.
How Often Can a Hyaluronic Acid Injection Be Repeated?
A hyaluronic acid injection can be repeated in suitable patients, but the interval is not the same for every product or individual. The American College of Rheumatology states that when HA injections provide pain relief, treatment may be repeated after approximately six months. The appropriate timing should still be determined by the treating doctor.
For Hyruan ONE specifically, PhilosMed states that repeat treatment can be given when required and may be administered as frequently as every three months, depending on how long pain relief lasts for the individual.
This does not mean every patient should automatically receive another injection after three months. If symptoms remain well controlled, another treatment may not yet be necessary.
Why Does the Frequency of HA Injections Vary?
The frequency varies because HA products have different formulations and treatment schedules, while individual responses to treatment also differ. Some products require a single injection, whereas others are administered as a series of injections over several weeks.
Factors that may influence the timing of repeat treatment include:
- The type of HA product being used
- Severity of knee osteoarthritis
- Duration of pain relief after the previous treatment
- Changes in pain, stiffness and mobility
- Daily activity and lifestyle
- Overall condition of the knee joint
- The doctor’s assessment of treatment response
A patient who continues to experience symptom relief several months after treatment may have no reason to repeat it immediately. Someone whose symptoms return earlier should discuss the next step with their doctor rather than scheduling another injection independently.
How Often Is Hyruan ONE Given?
Hyruan ONE is designed as a single-injection treatment, meaning one injection constitutes a treatment course rather than requiring several weekly appointments. PhilosMed states that its pain-relieving effect may last approximately 6–12 months, although the actual duration differs between patients.
According to PhilosMed, pain reduction may begin around two to three weeks after treatment, with the greatest reduction potentially occurring between weeks 10 and 14.
If the effects eventually wear off, Hyruan ONE can be considered for repeat treatment. PhilosMed states that it may be repeated as frequently as every three months depending on how long the individual’s pain relief lasts.
The timing should always be discussed with the treating doctor, particularly if symptoms have changed since the previous injection.
How Often Is Hyruan PLUS Given?
Hyruan PLUS uses a different treatment schedule. Rather than one injection, a complete course consists of three injections, with one injection administered each week for three consecutive weeks.
PhilosMed describes Hyruan PLUS as a non-cross-linked, high-molecular-weight hyaluronic acid formulation. The company states that pain relief lasts an average of approximately six months, although individual results can vary.
The difference can be summarised as follows:
| Treatment | Hyruan ONE | Hyruan PLUS |
| Injections per course | 1 injection | 3 injections |
| Schedule | Single treatment | Once weekly for 3 weeks |
| HA type | Cross-linked | Non-cross-linked |
| Molecular weight | 10 million Dalton | 3 million Dalton |
| Stated average pain relief | 6–12 months | Around 6 months |
| Repeat treatment | Based on individual response | Based on individual response |
Treatment schedules and stated duration are based on PhilosMed product information. Individual results may vary.
The number of injections required should therefore not be confused with how frequently a complete treatment course can be repeated.
Do You Need Another HA Injection When the Pain Returns?
The return of knee pain may be one reason to discuss repeat HA treatment with a doctor, particularly when the previous course provided meaningful relief. However, recurring pain does not automatically mean another injection is always the most appropriate next step.
The doctor may consider how well the previous injection worked, how long the benefit lasted and whether the symptoms or condition of the knee have changed.
The American Academy of Orthopaedic Surgeons (AAOS) notes that when viscosupplementation is effective, it may be repeated after a period of time, commonly around six months. However, AAOS also states that hyaluronic acid injections are not recommended for the routine treatment of symptomatic knee osteoarthritis because evidence regarding their overall effectiveness remains mixed.
This makes individual assessment particularly important rather than following a fixed repeat schedule.
Is It Safe to Have Repeated Hyaluronic Acid Injections?
Repeated courses of HA injections have been studied in people with knee osteoarthritis. A 2018 systematic review of 17 studies found that repeated courses maintained or further improved pain reduction without an increased safety risk compared with initial treatment courses. One of the longest studies repeated treatment every six months for 25 months.
This does not mean repeated injections are automatically appropriate for every patient. The decision should still consider the person’s response to previous treatment, knee condition and overall health.
Common short-term reactions after HA injections can include:
- Pain around the injection site
- Temporary swelling
- Warmth around the knee
- Joint stiffness or discomfort
The American College of Rheumatology notes that these reactions are usually short-lived. Persistent or worsening pain and swelling should be reported to the treating healthcare professional.
How Long Should You Wait Before Deciding Whether an HA Injection Worked?
Patients should generally allow some time before judging the outcome because a hyaluronic acid injection does not necessarily provide immediate pain relief. Improvement may take several days or weeks depending on the product and individual response.
For Hyruan ONE, PhilosMed states that pain reduction may begin around two to three weeks after the injection. The strongest reduction in pain may be experienced later, around weeks 10 to 14.
Receiving another injection simply because there is no immediate improvement may therefore be inappropriate. Follow-up with the treating doctor allows sufficient time to assess whether the first treatment has provided a meaningful benefit.
Can HA Injections Be Used as a Long-Term Treatment for Knee Pain?
HA injections may be used repeatedly in selected patients who experience meaningful symptom relief, but they do not cure osteoarthritis or restore damaged cartilage. Their role is primarily related to symptom management, and the evidence for routine use remains debated.
The American College of Rheumatology notes that some patients who respond to HA injections may experience relief for several months and can receive repeat treatment. However, treatment response varies considerably between individuals.
Malaysia’s Ministry of Health has also reviewed HA injections for joint disorders and reported that evidence supports short-term symptom relief for knee osteoarthritis, while benefits are generally not sustained beyond six months across the available evidence.
Long-term knee osteoarthritis management may therefore involve a combination of approaches, including appropriate exercise, weight management, physiotherapy, medication and other treatments recommended by a healthcare professional.
Frequently Asked Questions About Hyaluronic Acid Injection
Can I have a hyaluronic acid injection every three months?
It depends on the product and your individual condition. PhilosMed states that Hyruan ONE may be repeated as frequently as every three months depending on how long pain relief lasts. This is product-specific guidance and does not mean every HA injection should automatically be repeated at three-month intervals.
Can HA injections be repeated every six months?
Yes, repeat treatment at around six months is commonly described when the previous HA injection provided meaningful relief. The American College of Rheumatology states that successful injections may be repeated after six months. Your doctor should determine whether another treatment course is appropriate.
How many HA injections are needed for knee pain?
It depends on the formulation. Hyruan ONE requires a single injection for one treatment course, while Hyruan PLUS involves one injection per week for three weeks. Other HA products may use different schedules, so patients should follow the instructions for their prescribed treatment.
Will repeated HA injections cure knee osteoarthritis?
No. HA injections are used to manage symptoms and do not cure osteoarthritis or regrow damaged cartilage. AAOS notes that viscosupplementation has not been shown to reverse the arthritic process. Treatment should therefore form part of a wider knee osteoarthritis management plan.
When should I ask my doctor about another HA injection?
Speak to your doctor if knee pain or stiffness begins returning after a previous injection. The doctor can assess how long the previous treatment worked, whether your osteoarthritis has changed and whether another HA injection or a different treatment would be more appropriate.
Conclusion
ow often a hyaluronic acid injection can be taken depends on the product, treatment response and condition of the knee. While repeat treatment at around six months is commonly described, PhilosMed states that Hyruan ONE may be repeated as frequently as every three months when appropriate.
The decision should not be based on timing alone. A healthcare professional should assess how well the previous treatment worked, how long the relief lasted and whether another injection is suitable.
To learn more about Hyruan ONE or Hyruan PLUS for knee osteoarthritis, contact PhilosMed Marketing Sdn Bhd and discuss your treatment options with a qualified healthcare professional.
This article is for informational purposes only and does not replace professional medical advice, diagnosis or treatment.