Cortisone Injections for Joint Pain: What They Do (and What They Don’t)

Cortisone injections are one of the most commonly used tools in the management of joint pain, and one of the most commonly misunderstood. They can provide meaningful, sometimes rapid relief from pain and inflammation, and in the right clinical context, they are a valuable part of a management plan. They are not, however, a cure. Understanding what cortisone does, how long it lasts, and what it cannot achieve is essential to using it well.

Key Takeaway

A cortisone injection helps reduce inflammation and pain. It does not repair damaged cartilage, reverse arthritis, or rebuild muscle. Its most important role is to create a window of reduced pain during which rehabilitation and strengthening can take place.

What Is a Cortisone Injection?

Cortisone is a corticosteroid, a synthetic version of a hormone produced naturally by the adrenal glands. When injected directly into a joint or the soft tissues surrounding it, it acts as a potent anti-inflammatory agent, suppressing the local inflammatory response that drives joint pain and swelling.

Most cortisone injections for joint pain combine a corticosteroid with a local anaesthetic. The anaesthetic provides immediate but short-lived pain relief, which typically fades within hours. The cortisone itself takes effect over the following days and, when it works well, produces relief that can last weeks to months.

Injections are delivered under clinical guidance, sometimes with ultrasound imaging to ensure accurate placement into the target structure. The accuracy of placement is particularly important for smaller joints and deep structures, such as the hip.

What Conditions Are Cortisone Injections Used For?

Cortisone injections are used across a wide range of musculoskeletal conditions. In the context of hip and knee pain, the most common indications include:

• Osteoarthritis of the knee or hip: inflammation contributes to pain alongside structural joint damage. Injections are most effective in the earlier and moderate stages of disease, where significant cartilage and joint architecture remain.
• Inflammatory arthritis flare-ups: Including rheumatoid arthritis and other inflammatory conditions, where a joint injection can manage an acute flare while systemic disease-modifying treatment continues.
• Bursitis: Inflammation of the fluid-filled sacs that cushion bony prominences. Trochanteric bursitis at the outer hip and prepatellar bursitis at the front of the knee are common examples.
• Tendinopathy: Selected tendon conditions where local inflammation is a significant component, though the evidence for cortisone in tendinopathy is more nuanced than for joint injections.
• Post-procedural pain flares: In some cases, a cortisone injection is used to manage a pain flare following a procedure or as a bridge to a planned surgical intervention.

The presence of inflammation is not always obvious to patients. Some experience it as a constant aching, others as episodic flares of sharp pain and swelling. Understanding why arthritis pain comes and goes helps clarify why inflammation behaves unpredictably and why management needs to address both the acute and background components.

How Long Does a Cortisone Injection Last?

This is the question patients ask most often, and it does not have a single answer. The duration of benefit from a cortisone injection varies considerably between individuals and depends on several factors:

• The condition being treated: Inflammatory conditions and early osteoarthritis tend to respond better and for longer than advanced end-stage joint disease, where there is little remaining joint architecture for the injection to protect.
• The accuracy of placement: An injection delivered precisely into the target structure produces better results than one that misses. Ultrasound guidance improves placement accuracy.
• What happens after the injection: This is the factor most within a patient’s control. Patients who use the pain relief window to engage with physiotherapy and progressive strengthening consistently achieve better and more durable outcomes than those who return immediately to the activity patterns that provoked the pain.

In general, patients can expect relief lasting anywhere from a few weeks to several months. For some patients, a single injection provides enough relief to allow meaningful rehabilitation progress. 

For others, repeat injections are required. Most clinicians recommend limiting injections to a small number per year in any given joint, as repeated high-dose cortisone exposure can adversely affect cartilage and surrounding soft tissues.

Clinical Note: Injection Frequency

Cortisone injections should not be used as the primary long-term management strategy for joint pain. Repeated injections into the same joint, particularly at frequent intervals, carry risks including infection, crystal deposition, cartilage thinning, tendon weakening, and local tissue atrophy. The goal is to use injections strategically as part of a broader plan, not as a substitute for one.

What Cortisone Injections Cannot Do

This is the part of the conversation that matters most. Cortisone manages inflammation. It does not address the structural and muscular factors that drive joint pain over the longer term.

Cortisone Does Not Repair Cartilage

Articular cartilage has a very limited capacity for self-repair. Once it is damaged or lost, cortisone cannot restore it. In early wear and tear, the cartilage loss that underpins pain is a structural reality that no injection can change. What an injection can do is reduce the inflammatory component of pain, which often accounts for a significant proportion of symptom burden even in structurally damaged joints.

Cortisone Does Not Rebuild Muscle

The pain-weakness cycle is central to understanding why joint pain persists and worsens over time. Pain leads to reduced activity, reduced activity leads to muscle weakening, and weakened muscles expose the joint to greater mechanical stress with every step. A cortisone injection does nothing to interrupt this cycle unless the pain relief it provides is actively used to build strength.

This is why injection therapy works best when it is combined with a structured rehabilitation programme. Keeping moving and building strength are essential partners to injections in joint pain management. The injection creates the conditions for rehabilitation; rehabilitation produces the durable change.

Cortisone Does Not Prevent Disease Progression

A cortisone injection does not slow the progression of osteoarthritis or other joint diseases. Managing inflammation reduces symptom burden; it does not alter the underlying trajectory of structural change. For this reason, injections are most appropriately viewed as one component of a management plan, alongside exercise, weight management, activity modification, and, where necessary, surgical assessment.

The Management Framework

Cortisone injections fit within a broader approach: 

(1) Control inflammation to reduce pain and restore the ability to participate in rehabilitation. 

(2) Use the relief window actively for progressive strengthening and load management. 

(3) Address the underlying condition with appropriate ongoing management, whether conservative or surgical. An injection without a plan for what follows is a missed opportunity.

What to Expect After an Injection

The local anaesthetic in most injections provides immediate but short-lived pain relief. As this wears off over the first 12 to 24 hours, some patients experience a temporary increase in discomfort, sometimes called a post-injection flare. This is a normal response to the injection itself and typically settles within 48 hours.

The cortisone component takes effect progressively over the following days. Patients generally notice meaningful improvement within three to seven days. During this time, the injection site should be kept free of significant loading, and the joint should be protected from activities that could provoke inflammation before the cortisone has taken full effect.

Once the cortisone is working, the priority shifts to rehabilitation. Physiotherapy referral, or continuation of an existing programme, should be in place before the injection is administered so that the transition from pain control to active rehabilitation is seamless.

Who Is a Good Candidate for a Cortisone Injection?

Cortisone injections are most appropriate for patients with:

• A confirmed inflammatory component to their joint pain, whether from osteoarthritis, inflammatory arthritis, or a soft tissue condition.
• Sufficient joint architecture remains for the injection to provide meaningful benefit.
• A clear plan for what rehabilitation will look like during and after the relief period.
• Pain that is limiting their ability to participate in the strengthening and activity that forms the backbone of conservative management.

They are less appropriate for end-stage joint disease with minimal remaining joint space, where the structural basis for pain has progressed beyond what anti-inflammatory management can meaningfully address. In these cases, surgical assessment becomes the more relevant conversation. 

Patients who are noticing arthritis flare-ups alongside their baseline joint pain are particularly likely to benefit from early assessment to distinguish inflammatory from mechanical pain drivers.

Assessment at Dr Dan Cohen Orthopaedics

Cortisone injections are one tool within a broader framework of joint pain management. Dr Dan Cohen provides orthopaedic assessment for patients with hip and knee pain across Sydney, consulting at Bondi Junction and Kogarah.

Assessment establishes a clear diagnosis, identifies the inflammatory and structural components of each patient’s pain, and determines whether a cortisone injection is appropriate, what it is likely to achieve, and what should follow it. The goal is a management plan that addresses all the contributing factors, not just the acute symptom.