Arthrosamid® Safety, Complications & Context
An open and balanced discussion regarding the long-term clinical profile of polyacrylamide hydrogel treatments.
Arthrosamid® (a registered trademark of Contura A/S.).
All medical treatments carry potential risks. This includes Arthrosamid®, a form of polyacrylamide hydrogel.
Published knee studies and product information describe safety outcomes. Other hydrogel uses provide context but are not direct estimates for an Arthrosamid knee injection.
Reviewed byProfessor Paul YF Lee MBBch, FRCS (Tr & Orth), PhDCartilage and joint preservation expertiseQuick answer
Temporary injection-site pain, stiffness or swelling can occur. Less common but more serious complications include infection and reactions requiring medical review. Active infection, planned recent knee surgery or arthroscopy, and product-specific contraindications are reasons not to proceed or to postpone treatment. The professional product information is manufacturer-owned and should be read alongside independent clinical assessment.
What Has Been Reported in the Medical Literature
There are published papers describing complications related to polyacrylamide hydrogels, most notably under the brand name Aquamid (a chemically similar product from the same manufacturer group, marketed under a different label).
These reports primarily relate to:
- Cosmetic and soft-tissue injections
- Large injection volumes
- Non-joint tissues (breast, fat)
- Long-term follow-up (many years)
Reported complications include:
- Chronic inflammation
- Infection (delayed presentations)
- Nodules or firmness
- Migration of material
- Need for surgical removal
For transparency, patients who wish to explore this literature in detail are encouraged to read the published review article on Aquamid complications.
Why Context Matters
It is important to understand that clinical outcomes are heavily influenced by the environment and method of application:
The knee joint is a very different biological environment from soft tissue.
Arthrosamid® for knee osteoarthritis is delivered:
- In much smaller volumes
- Inside the joint, not under the skin
- Using image-guided techniques
Most published complication data relate to historic cosmetic use, not modern intra-articular knee treatment.
"That said, differences in indication do not eliminate risk, and this literature reinforces why careful patient selection, technique, and follow-up are essential."
What We See in Knee
Osteoarthritis Practice
In the published observational cohort and product-safety information:
Reported temporary reactions include pain, swelling and stiffness. The available sources do not justify inventing a clinic-specific incidence or promising a mild course for every patient.
The most frequently observed issues are:
Joint infection remains a recognised serious risk with any intra-articular injection. The available sources do not justify promising a zero-risk procedure.
Because Arthrosamid® is non-biodegradable, any complication — should it occur — may be more complex to manage than with short-acting injections.
This is discussed openly during consultation to ensure patients can make a fully informed decision about their care pathway.
Why We Include This Warning
Integrity in patient care requires full disclosure. We believe patients should:
- Be aware that not all published hydrogel safety data relates to knee osteoarthritis
- Understand that long-term data continues to evolve
- Have access to both supportive and critical literature
- Make decisions based on balanced information, not marketing
"For this reason, Arthrosamid® is not offered routinely, and we do not recommend it where the risk–benefit balance is unfavourable."
What This Means for You
If you are considering Arthrosamid®, our clinical team will guide you through a comprehensive consultation covering:
Potential benefits
Known and theoretical risks
Alternative treatments
Whether this option fits your goals and your knee condition
If you would like to read the published paper discussing Aquamid complications in more detail, please let us know.
Informed decisions require full information — including uncomfortable parts.
Am I Suitable?
Take the Arthrosamid® Suitability Assessment
Answer eight short questions on the dedicated assessment page to organise the information relevant to your consultation. The questionnaire is a decision aid and does not diagnose knee pain or confirm treatment suitability.
Start the Suitability AssessmentVetting Your Arthrosamid® Clinic
Questions to ask any clinic before Arthrosamid®
Assessment, sterile technique, antibiotic decisions and aftercare all contribute to risk management, but cannot eliminate complications. These questions help patients compare how clinics handle those safeguards.
Is the injection delivered under real-time ultrasound guidance?
Ultrasound helps the clinician visualise the joint and needle in real time. It supports delivery but cannot guarantee placement, safety or outcome.Who performs the injection?
A consultant-led pathway where the clinician you consult is the clinician who injects gives you a single point of accountability. A consultation/inject hand-off is cheaper to staff but is not the same service.What infection-prevention protocol is used?
Joint infection after Arthrosamid® is rare but serious. Ask the clinic to walk you through their sterile-field standards, antibiotic policy, and how a post-injection flare is managed.Are IV antibiotics used as part of the protocol?
Routine IV antibiotic cover is a deliberately conservative choice; not every UK clinic uses it. Ask whether IV is standard, oral-only is offered, or no antibiotic cover is used at all — and whether the choice is yours.What happens if symptoms flare after treatment?
A short-lived post-injection flare is common; a persistent flare warrants prompt review. Ask about out-of-hours support, escalation pathway and whether further appointments are included.What clinical follow-up is included as standard?
A six-week clinical review is the minimum we would recommend. Some packages skip follow-up entirely or quote it separately later.How many Arthrosamid® injections has the clinician performed?
Experience may be relevant, but round activity totals are not outcome evidence. Ask how a number is defined, whether it has an audited source and its “as of” date.How does the clinic decide who is NOT suitable for Arthrosamid®?
A clinic willing to decline unsuitable cases is selecting for outcomes. A clinic that says yes to everyone is selecting for revenue. The first conversation should include an honest “this may not be right for you” pathway.
Watch Out For
Red flags when choosing an Arthrosamid® provider
No clear discussion of infection risk
Infection is rare but is the most serious complication. A clinic that does not mention it or skips the antibiotic question is leaving a known risk unaddressed.No clear antibiotic protocol
Ask explicitly whether antibiotics are routine, whether IV or oral is used, and the reasoning. Vague answers are a signal.No imaging review before treatment
An MRI or detailed ultrasound review before injection is what tells us whether Arthrosamid® is the right treatment. Skipping imaging review compresses the assessment.Injection offered without a suitability assessment
Arthrosamid® is not right for every osteoarthritis patient. A consultation that ends with “book the injection” without a clinical decision is selling, not treating.No follow-up plan
If the post-treatment plan is “see how you go”, you are paying for an injection, not for a service. Six-week clinical review should be the minimum.Guaranteed or permanent cure claims
Arthrosamid® is intended for symptom management, not as a cure. Claims of permanent results, guaranteed outcomes, cartilage regeneration or prevention of surgery go beyond the evidence.
Side Effects, Risks & Suitability
Frequently asked questions
For infection-specific questions see the Arthrosamid® infection risk and prevention page.
Is Arthrosamid® safe?
Arthrosamid has recognised temporary reactions and less common complications. Ultrasound guidance, sterile technique, antibiotic cover and careful selection support safe practice but do not eliminate risk. Clinical assessment is essential because product-specific contraindications and reasons to postpone must be checked before treatment.
What are the most common Arthrosamid® side effects?
The most commonly reported side effects are short-term injection-site pain, mild swelling, warmth and joint stiffness after treatment. A temporary flare should trend towards settling. The clinic reviews patients at six weeks and earlier when symptoms warrant; worsening pain, heat, redness, swelling, fever or systemic illness needs prompt advice.
What are the more serious risks of Arthrosamid®?
Joint infection is a serious potential complication. Other reported problems include a persistent inflammatory reaction or symptoms requiring further assessment. The clinic's protocol reduces avoidable risk but cannot make risk zero. Read the dedicated Arthrosamid infection risk page for a full explanation of how London Cartilage Clinic minimises infection risk.
Is Arthrosamid® reversible?
Arthrosamid is non-absorbable and intended to remain in the joint. It is not a temporary injectate that the body is expected to clear, and removal can be difficult if a serious complication occurs. That makes selection, infection prevention and informed consent especially important.
Can Arthrosamid® damage cartilage?
Arthrosamid® is a cushioning hydrogel, not a regenerative product, and it does not regenerate cartilage. The available symptom-outcome evidence does not establish that it changes structural progression in either direction. Osteoarthritis can continue to progress after treatment.
Who should not have Arthrosamid®?
Manufacturer professional information states that it should not be used where there is an active joint infection or where knee surgery or arthroscopy has occurred within the defined product-safety window. Infection elsewhere, broken skin near the site, acute illness, medicine allergies and planned procedures can also require postponement and clinician review. See the Arthrosamid® suitability self-assessment.
Book an Arthrosamid® Assessment – London
Long-lasting relief starts with the right decision — not just an injection.