Steroid and Hyaluronic Acid Injections for Arthritis: What Does the Evidence Show?

An injection should follow a diagnosis

Pain near a joint is not automatically arthritis. Tendon disease, bursitis, a meniscus tear, referred spinal pain, infection, gout and fracture can look similar. Examination and appropriate imaging should establish what structure is painful before a needle is placed.

An injection is usually intended to reduce symptoms so that walking, sleep or rehabilitation becomes more manageable. It is not a cure for osteoarthritis and should sit within a broader plan that may include exercise, weight optimisation, activity modification and appropriate medication.

Corticosteroid injections: where they may fit

Corticosteroid is a strong anti-inflammatory medicine. In knee osteoarthritis, guidelines support it as an option for short-term symptom relief, particularly when pain is accompanied by synovitis, swelling or an acute flare. Response is variable: some patients gain useful relief for several weeks, while others notice little change.

The benefit is temporary and does not reverse cartilage loss. A strategy of automatically repeating an injection every few months is different from selective use. In a two-year randomised trial, triamcinolone every 12 weeks caused greater cartilage-volume loss than saline and did not improve long-term pain, which supports caution with frequent scheduled injections.

• Potential role: a painful inflammatory flare, troublesome effusion or a temporary window for rehabilitation
• Not a reliable role: rebuilding cartilage, correcting deformity or permanently preventing replacement surgery
• Important risks: infection, a short post-injection flare, skin or fat changes, and temporary elevation of blood glucose—especially in diabetes

Hyaluronic acid: why the evidence is controversial

Hyaluronic-acid products—sometimes called viscosupplementation or gel injections—aim to supplement the lubricating properties of joint fluid. They are mainly used in the knee; evidence for hip arthritis is less favourable, and accurate hip injections require imaging guidance.

Some individual patients report benefit, but the average effect in the best evidence is small. A large 2022 review of 169 trials found that the improvement over placebo was below a clinically important threshold. The AAOS does not recommend hyaluronic acid for routine knee-arthritis use, while the American College of Rheumatology conditionally recommends against it in knee arthritis and strongly recommends against it in hip arthritis.

A conditional recommendation against does not mean that no patient can ever improve. It means the expected benefit is uncertain or small enough that cost, alternatives, risks and the strong placebo/contextual response should be discussed honestly before treatment.

Steroid versus hyaluronic acid

Steroid has stronger evidence for short-term relief and is often chosen when inflammation or swelling is prominent. Hyaluronic acid is slower acting and sometimes considered only after exercise, weight management, medication and other reasonable measures have not provided enough relief—but it should not be presented as cartilage restoration.

Neither treatment should delay reassessment when pain is severe, the knee is mechanically locked or unstable, the diagnosis is uncertain, or progressive arthritis is causing major loss of independence. An injection that repeatedly fails is useful information: repeating the same treatment is unlikely to correct a structural problem.

Timing before joint replacement matters

Tell your surgeon about every injection and its date. Observational evidence associates injections given close to knee replacement with a higher risk of periprosthetic joint infection. Many arthroplasty surgeons therefore avoid steroid or hyaluronic-acid injections into the operative knee during the three months before planned replacement, while individual policies may be more conservative.

If replacement may be approaching, discuss timing before arranging another injection. The small possibility of temporary relief must be weighed against the surgical plan and the consequences of infection around an implant.

A practical decision framework

The most useful question is not simply ‘Which injection is best?’ It is ‘What is causing the pain, what outcome are we trying to achieve, and what will we do if the injection does not help?’

• Confirm the diagnosis and severity before treatment
• Set a realistic short-term goal such as improved sleep, walking or participation in rehabilitation
• Consider diabetes, anticoagulation, infection risk, allergies and planned surgery
• Record the medicine, dose, joint, date and response
• Reassess rather than automatically repeating an ineffective injection