Written by Dr Gerard Ee

When knee osteoarthritis flares and the pain is sharp, swollen and limiting, patients need fast relief. For decades, the cortisone injection for knee pain has been the treatment of choice. It is highly effective but also often misunderstood. Effectiveness depends on timing of the injection.

This article explains what a steroid injection is, how it works, when it genuinely helps, what its risks and limitations are and how often it can sensibly be used. This article includes clinical perspective from Dr Gerard Ee at The Clifford Clinic in Singapore.

What Is a Steroid (Cortisone) Injection?

A steroid knee injection delivers a corticosteroid medication directly into the knee joint, usually combined with a local anaesthetic. Corticosteroids are anti-inflammatory medications. They are not the anabolic steroids associated with sport and muscle building. They are made up of different ingredients.Corticosteroids are powerful suppressors of inflammation. When injected into an osteoarthritic knee that is inflamed and painful, they act to calm that inflammation down.

How a Cortisone Injection Works for Knee Pain

Osteoarthritis is not purely mechanical. Alongside cartilage wear, there is frequently an inflammatory component within the joint lining. During a flare, that inflammation drives swelling, heat, stiffness and pain, sometimes well out of proportion to the underlying structural change.

A cortisone injection targets that inflammatory process. By suppressing inflammation within the joint, it can reduce swelling and pain.For a patient in the middle of a difficult flare, that relief can be significant.

What a steroid injection does not do is change the underlying arthritis. It does not lubricate the joint, it does not regrow or repair cartilage. It is a symptom-control treatment. Although it switches down the inflammation, osteoarthritis itself remains.

The Benefits: When a Steroid Injection Genuinely Helps

If you have arthritis, a cortisone injection can:

Rapid relief of an acute flare. When the knee is acutely inflamed and very painful, few treatments settle it as quickly.
A window to rehabilitate. By reducing pain, a steroid injection can make it possible to start or resume physiotherapy and strengthening that pain had been blocking.
A bridge to other treatment. It can settle an angry joint so that a more sustained treatment plan, such as regenerative options can be carried out under better conditions.
A useful diagnostic and functional aid in selected cases, helping confirm that the joint is the pain source and giving the patient relief for an important event or period.

Steroid injections are best at handling short-term problems such as flares, acute inflammation and improving patient mobility.

The Risks and Limitations

The relief from a cortisone injection is temporary. It typically last from a few weeks to a few months and tends to become less effective with repetition. Frequent or repeated steroid injections into the same joint are discouraged. There are concerns that overuse may, over time, be detrimental to cartilage, and repeated injections can carry other local risks. For this reason, doctors generally limit how often a steroid injection is given into the same knee within a year.

A steroid injection does not slow the progression of osteoarthritis; some patients experience a brief steroid flare of increased pain in the first few days. Blood sugar can rise temporarily, which matters for patients with diabetes. With any joint injection, there is a small risk of infection but none of this makes steroid injections bad.

How Often Can a Steroid Injection Be Used?

Steroid injections into a knee are generally spaced out. There is usually a limit on how many are given in a 12-month period. If a knee keeps needing repeated cortisone injections to stay tolerable. It means the underlying problem is not being addressed, and the treatment plan should be reconsidered.Steroid Injections vs Regenerative and Lubricating Options

A steroid injection acts fast and is excellent for a flare, but its effect is short-term and it does not improve the joint itself. Hyaluronic acid aims to improve lubrication with a slower, more sustained effect. PRP and Conjuran aim to influence the biological environment of the joint, with effects that build more gradually.

A common practice is to use a steroid injection to settle an acute flare, and then move on to a more sustainable strategy, such as strengthening, load management, and where appropriate a regenerative or lubricating injection.

Expert Opinion: The Clifford Clinic’s Approach to Steroid Injections

At The Clifford Clinic, steroid injections are used selectively ande short term. Dr Gerard Ee and the team regard cortisone as a valuable treatment for an acute inflamed flare that is stopping a patient from functioning or from progressing with rehabilitation. What the clinic avoids is treating steroid injections as a long-term solution. The relief is temporary. and cortisone is not offered as something to return to every few months. Treatment should include settling the joint and creating a window where the patient can rebuild strength, manage load and move on to a more durable plan that may include hyaluronic acid, PRP or Conjuran.

The injection is matched to the patient’s OA grade, age, weight and activity level, after the source of pain has been confirmed. The goal is always to keep patients active and to delay or avoid knee replacement where possible.

Frequently Asked Questions

Is a cortisone knee injection the same as anabolic steroids? No. Cortisone is a corticosteroid, an anti-inflammatory medication. It is different from the anabolic steroids associated with muscle building.

How quickly does a steroid injection work for knee pain? Many patients feel relief within a few days as the inflammation settles. Some experience a brief increase in pain in the first day or two before improvement begins.

How long does the relief last? Typically several weeks to a few months. The duration varies between patients, and the effect tends to lessen with repeated injections.

How many cortisone injections can I have in my knee? Doctors generally limit how often steroid injections are given into the same knee, because of concerns around repeated use. If a knee needs frequent injections, the overall treatment plan should be reviewed.

Does a steroid injection treat the arthritis itself? No. It controls inflammation and pain but does not slow osteoarthritis or repair the joint. It is best used for short-term relief, alongside a longer-term strategy.

Speak to The Clifford Clinic About Your Knee Pain

If your knee is flaring and you want to understand whether a steroid injection is the next step to take, do drop by The Clifford Clinic for a consultation with our doctor.Knee assessments and injections at The Clifford Clinic are carried out by an experienced medical team that includes sports physicians and orthopaedic surgeons, supported by an MOH-approved day surgery facility . Knee joint injections may also be claimable through Medisave and insurance.The Clifford Clinic 50 Raffles Place, #01-01 Singapore Land Tower, Singapore 048623 (Exit B, Raffles Place MRT) Phone: (65) 6532 2400 | WhatsApp: (65) 8318 6332

About Dr Gerard Ee

Dr Gerard Ee is the founder and medical director The Clifford Clinic who is also trained in orthopaedic surgery, with a substantial peer-reviewed research record in orthopaedics. His published work spans knee surgery, including studies on total knee arthroplasty and joint line restoration in The Knee and the Journal of Bone and Joint Surgery (British), as well as shoulder, spine and bone-healing research in journals including Knee Surgery, Sports Traumatology, Arthroscopy and Clinical Orthopaedics and Related Research. This research-informed background underpins the measured, evidence-based approach to knee care at The Clifford Clinic.

Medical Disclaimer

This article is for general education only and is not a substitute for personalised medical advice. Suitability for a steroid injection or any knee injection can only be determined after an in-person assessment by a qualified doctor. Outcomes vary between individuals, and patients with diabetes or other conditions should discuss specific considerations with their doctor.

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Steroid (Cortisone) Injections for Knee Pain: Benefits, Risks and Timing