How Long Do Knee Gel Injections Last?

Summary

Knee gel injections do not provide permanent pain relief. According to PhilosMed, patients receiving Hyruan ONE may begin noticing pain reduction within 2–3 weeks, with relief potentially lasting six months or longer. However, individual results vary according to factors such as osteoarthritis severity and response to treatment.

• Pain relief may not be immediate after a knee gel injection.
• PhilosMed states Hyruan ONE may provide relief for 6–12 months.
• Individual results can vary according to the severity of knee osteoarthritis.
• Some patients may be considered for repeat treatment when symptoms return.

How Long Do Knee Gel Injections Usually Last?

The effects of knee gel injections vary between individuals and products, but pain relief may last for several months in people who respond to treatment. Cleveland Clinic notes that many patients who experience relief from viscosupplementation can go around six months before another dose may be considered.

For Hyruan ONE specifically, PhilosMed states that its single-injection treatment may provide pain relief for approximately 6–12 months. However, this does not mean every patient will experience the same duration of relief.

The response can depend on the severity of osteoarthritis, the condition of the joint and how the individual responds to the injection. A doctor should therefore assess whether the treatment is appropriate and how the knee responds over time.

How Soon Do Knee Gel Injections Start Working?

Knee gel injections generally do not work immediately. Unlike treatments intended to provide rapid short-term pain relief, hyaluronic acid injections may take several weeks before an individual notices an improvement in knee pain and movement.

According to PhilosMed’s Hyruan ONE guidance, patients may begin experiencing pain reduction approximately 2–3 weeks after treatment. The greatest reduction in pain may occur between weeks 10 and 14.

This means a patient should not necessarily assume that the injection has failed if there is no significant improvement during the first few days. Follow the doctor’s advice and allow sufficient time to assess the response.

Why Can Knee Gel Injections Provide Relief for Several Months?

Knee gel injections contain hyaluronic acid, a substance naturally present in synovial fluid inside healthy joints. Synovial fluid lubricates the joint and helps absorb forces during movement, allowing the surfaces within the knee to move more smoothly.

With osteoarthritis, the properties of the synovial fluid can change. Hyaluronic acid viscosupplementation is injected directly into the affected joint with the aim of supplementing the joint fluid.

Hyruan ONE uses cross-linked hyaluronic acid with a high molecular weight and high HA concentration. PhilosMed describes the treatment as being designed to restore lost viscoelasticity in joints affected by osteoarthritis.

However, the injection does not reverse osteoarthritis or permanently repair damaged cartilage. Any symptom relief experienced after treatment can eventually decrease.

What Affects How Long Knee Gel Injections Last?

How long knee gel injections last can differ considerably between patients. Osteoarthritis severity is one factor, but overall joint condition, activity level and individual response to hyaluronic acid treatment may also influence the outcome.

Factors that may affect the duration of relief include:

• Severity of osteoarthritis: Patients at different stages of knee OA may respond differently.
• Individual response: Not everyone experiences the same degree or duration of pain relief.
• Type of HA injection: Formulations vary in molecular weight, concentration and number of injections required.
• Activity level: The demands placed on the knee vary considerably between individuals.
• Overall knee condition: Other problems affecting the joint may contribute to ongoing symptoms.

This is why the expected duration should be discussed with the treating doctor rather than viewed as a guaranteed timeframe.

How Do Single and Multiple Knee Gel Injections Differ?

Hyaluronic acid treatments are available as both single-injection and multiple-injection regimens. The number of injections depends on the specific product, with some requiring one injection and others requiring several injections over consecutive weeks.

PhilosMed offers both Hyruan ONE and Hyruan PLUS:

This comparison is based on PhilosMed’s product information. Individual treatment response and duration can vary.

Hyruan ONE may suit patients who prefer fewer clinic visits, while Hyruan PLUS provides the treatment across three weekly injections. The appropriate option should be determined after a doctor assesses the patient’s osteoarthritis and treatment needs.

Can Knee Gel Injections Be Repeated?

Knee gel injections may be repeated in appropriate patients when the benefits of an earlier treatment have worn off. The timing should be based on the individual’s response, symptoms and medical assessment rather than following the same schedule for every patient.

PhilosMed states that Hyruan ONE can be repeated when needed and notes that repeat treatment can be considered depending on how long pain relief lasts for the individual.

A previous positive response does not automatically mean another injection should be given without assessment. Knee osteoarthritis can progress, and changes in symptoms may require the doctor to reconsider the overall treatment plan.

What Should You Expect After a Knee Gel Injection?

Patients can usually return home shortly after a knee gel injection. Some temporary discomfort, redness, warmth or swelling may occur around the injection site, so strenuous activity is generally limited for a short period after treatment.

According to PhilosMed’s post-injection guidance for Hyruan ONE, patients are advised to rest, reduce movement and avoid sporting activities from Day 1 to Day 3. Normal walking, standing and other non-strenuous activities are permitted during this period.

From Day 4 onwards, light exercise and physiotherapy exercises may gradually resume according to the doctor’s advice. Activities such as stationary cycling and brisk walking on flat surfaces may be recommended.

Temporary side effects can include:

• Redness around the injection area
• Warmth
• Swelling
• Injection-site pain

PhilosMed states that these effects normally settle within 24–48 hours. If symptoms persist or become concerning, contact the treating doctor.

Are Knee Gel Injections Suitable for Everyone With Knee Osteoarthritis?

No. Knee gel injections are not suitable or effective for every person with knee osteoarthritis. A doctor should consider the severity of the condition, previous treatments, symptoms and individual health factors before deciding whether viscosupplementation is appropriate.

There is also ongoing clinical debate about the overall benefit of hyaluronic acid injections. The American Academy of Orthopaedic Surgeons (AAOS) does not recommend intra-articular hyaluronic acid injections for routine treatment of symptomatic knee osteoarthritis. NICE guidance in the UK similarly advises against offering intra-articular hyaluronan injections to manage osteoarthritis.

This does not mean that an individual patient cannot experience symptom relief. It means the evidence does not support routine use across all people with knee OA. Treatment decisions should therefore be made between the patient and a qualified healthcare professional based on individual circumstances.