Hydrogel injections are a modern, non-surgical treatment designed to cushion and protect the knee joint. For people living with osteoarthritis, they offer lasting relief by reducing mechanical stress within the joint – helping many remain active and delay the need for knee replacement.

This guide explains how hydrogel therapy works, who may benefit, what to expect during the procedure, and how it compares with hyaluronic acid, PRP, corticosteroids, and stem cell therapy. You’ll also find clear UK-specific guidance and a structured pathway to care at Regenesis.

How Hydrogel Injections Work Inside the Knee

Hydrogel injections, most commonly known through Arthrosamid, use a soft polyacrylamide gel placed directly into the knee joint. Once injected, the gel forms a durable, elastic cushion that absorbs pressure and enhances lubrication during movement.

The gel is composed of:

• A cross-linked polyacrylamide polymer for structural support
• Sterile water, making up the majority of the gel, helping reduce friction

Together, these elements reduce bone-on-bone pressure and improve joint glide. Many patients describe a gradual improvement in walking comfort, stability, and overall movement confidence.

A longer-term clinical study reported sustained improvements in pain, stiffness, and knee function over a full 52-week period after a single hydrogel injection, with over 62% of patients meeting OMERACT–OARSI responder criteria at one year. These findings suggest encouraging, persistent benefits for individuals living with symptomatic knee osteoarthritis.

Benefits of Hydrogel Injections

Hydrogel injections provide advantages that matter most to individuals managing osteoarthritis day to day. Rather than simply listing benefits, the following explanation outlines how improvements typically unfold.

Patients frequently report steadier pain levels over the weeks following treatment. This is largely due to improved shock absorption and reduced joint irritation. Many also find it easier to resume gentle exercise, walk longer distances, or stand for extended periods without the same degree of discomfort.

For individuals hoping to delay knee replacement, hydrogel injections may offer valuable breathing room. Their long-lasting mechanical support can help maintain functional mobility while preserving future surgical options.

To summarise these effects at a glance:

Many who enquire about hydrogel for knees are individuals seeking this combination of durability and simplicity.

What to Expect During the Procedure

Regenesis follows a structured, specialist-led approach to ensure accuracy and patient comfort throughout the process. A typical appointment includes:

The entire process typically takes 20-30 minutes, and most patients are able to walk out comfortably.

Recovery and Rehabilitation

Short-term soreness, stiffness, or mild swelling is common for 24-72 hours. These symptoms generally improve with simple analgesia, ice application and short-term activity modification.

Within a week, most patients resume normal routines. Low-impact exercise, range-of-motion work, and progressive strengthening under physiotherapy guidance help maximise results.

Follow-up appointments allow your clinician to track progress and offer advice tailored to your recovery.

How Hydrogel Compares With Other Non-Surgical Treatments

Selecting the right treatment depends on your goals, imaging findings, and previous responses to care. The table below helps clarify how hydrogel injections differ from other common options:

Hydrogel’s strength lies in its mechanical durability rather than biochemical or regenerative action.

Hydrogel vs Hyaluronic Acid: Key Differences

Hyaluronic acid acts as a temporary lubricant and is gradually absorbed by the body. This means courses often need to be repeated. 

Hydrogel injections, on the other hand:

• Remain in the joint long-term
• Provide continuous cushioning
• Offer more consistent mechanical support

Patients with chronic discomfort or repeated flare-ups may prefer the longevity associated with hydrogel.

Side Effects and Safety Considerations

Hydrogel injections have a reassuring safety profile when performed in specialist settings.

Is Hydrogel the Right Option for You?

Hydrogel injections offer a long-lasting, minimally invasive way to manage knee osteoarthritis and maintain daily independence. By cushioning the joint and reducing mechanical stress, they may help you remain active, improve comfort, and delay more invasive treatments.

For personalised advice and clinical assessment, our Regenesis team is here to help.

Frequently Asked Questions

How long does the treatment last?

Many people experience relief lasting several months to multiple years, depending on osteoarthritis severity and activity levels.

Will the injection regenerate cartilage?

No. Hydrogel offers mechanical cushioning rather than biological repair. Regenerative treatments such as PRP or stem cell therapy may be considered separately.

Is this treatment available across the UK?

Yes. Hydrogel therapy, including Arthrosamid, is available at specialist centres such as Regenesis.

What does treatment cost?

Pricing varies depending on the care package. Regenesis provides transparent pricing and includes consultation, ultrasound-guided injection, and follow-up.