Patient information

Orthopedic injections — when they may help, when they may not, and what to know

Joint and soft-tissue injections are a common orthopedic tool, but they are not the right answer for every problem. They do not replace physiotherapy, activity modification, weight management when needed, or surgery when the situation calls for it. This page offers an honest, evidence-based overview: what each injection type does, who it may suit, what the limits are, and what to expect. This information does not replace a personal examination — the final decision always depends on your specific case.

Common injection types

Corticosteroids

What it is: An anti-inflammatory medication injected into a joint, bursa, or soft-tissue area. Widely used in clinical practice for decades.
How it generally works: It suppresses local inflammation and swelling. Some patients experience pain relief and functional improvement for a limited period.
Common uses in practice: Moderate osteoarthritis, bursitis, frozen shoulder in the painful phase, tendon inflammations, and other inflammatory conditions depending on diagnosis and site. Common clinical uses also include degenerative joint changes (osteoarthritis) in joints such as the knee, trigger finger, shoulder bursitis or inflammation, and tendinopathies.
What the evidence suggests: Existing studies suggest pain relief for a portion of patients, especially in osteoarthritis and early inflammatory conditions. Results vary individually, and long-term benefit is not assured.
Limits and considerations: Should not be repeated too frequently into the same joint because of cumulative effects on cartilage, skin, and fat. Not appropriate when infection is suspected, fracture is untreated, or conservative care has not been tried appropriately.

Hyaluronic acid (viscosupplementation)

What it is: A substance similar to natural joint fluid, injected mainly into the knee. Sometimes described as joint "lubrication."
How it generally works: Aims to improve joint friction and cushioning. Some patients report gradual improvement after a course of injections.
Common uses in practice: Mild to moderate knee osteoarthritis, and occasionally other joints depending on local practice and guidelines.
What the evidence suggests: Long-term evidence remains debated. Studies and meta-analyses show that some patients benefit, but results are inconsistent and there is variation between products, protocols, and joints. It is not a substitute for rehabilitation or lifestyle change.
Limits and considerations: Less relevant in very advanced arthritis when the joint is already severely damaged. Cost, number of injections, and individual response all matter. Local swelling or temporary pain can occur.

PRP — platelet-rich plasma

What it is: A product derived from the patient's own blood. The process: a blood sample is taken, centrifugation separates the blood components, and the fraction rich in platelets and natural anti-inflammatory factors from the patient's body is re-injected into the affected area.
How it generally works: The idea is to deliver growth factors that may support tissue healing. The exact mechanism is still studied, and outcomes are not predictable in advance.
Common uses in practice: Tendinopathies, mild to moderate osteoarthritis, and other conditions under active research. Use varies between clinics and countries.
What the evidence suggests: Some studies are encouraging in selected settings, but overall evidence remains mixed. Some patients report improvement; others do not. There is no full agreement among the medical community that PRP is superior in every situation.
Limits and considerations: Cost, number of sessions, and lack of protocol uniformity. Not suitable for every diagnosis. Does not replace structural rehabilitation or surgery when mechanical damage is significant. Because PRP is derived from the patient's own blood, the likelihood of allergic or immune reaction is very low; the main practical caveat is mild, transient soreness at the injection site.

Diagnostic local anaesthetic injection

What it is: Injection of a numbing agent (for example lidocaine) into a structure suspected to be the pain source — joint, bursa, or other tissue.
How it generally works: If pain temporarily disappears after injection, that supports the hypothesis that the injected area is a significant source. If there is no change, another source should be considered.
Common uses in practice: Clarifying pain source when diagnosis is uncertain, distinguishing joint pain from referred pain, and guiding further treatment decisions.
What the evidence suggests: An established, evidence-based clinical method — a diagnostic tool in the clinical toolkit, not an intervention aimed at treating the underlying cause. It supports informed decisions together with examination and imaging.
Limits and considerations: Relief is temporary only. It does not treat the underlying cause. Results must be interpreted in full clinical context.

When an injection may help — and when it may not

Injection is considered when there is local inflammation or pain, conservative care has not been enough or relief is needed to allow physiotherapy. The overall joint structure may still respond. In some cases, a diagnostic injection helps clarify the pain source before moving forward.

Situations where injection is often considered

Mild to moderate osteoarthritis with pain and swelling limiting function, alongside continued physiotherapy and load management
Bursitis or local soft-tissue inflammation that does not settle with basic care
Frozen shoulder in the painful phase when pain relief is needed to allow exercise
Joint pain with a clear diagnosis and structure that may still respond to local treatment
Diagnostic injection to clarify pain source before further treatment

Situations where injection is less suitable or not enough

Advanced arthritis — for many patients, surgery may be the more durable long-term answer. However, for patients who are not candidates for surgery (medical contraindications, refusal of surgery, and similar), a corticosteroid injection is a very reasonable alternative for symptom control
Mechanical instability, full tendon tear requiring repair, or untreated fracture
Pain likely originating elsewhere (for example primarily from the neck radiating to the shoulder)
Active infection, open wound, or a condition requiring urgent different care
Expecting injection to replace rehabilitation, strengthening, or lifestyle change — without those, results are usually limited

Risks and side effects

Infection — rare but serious; fever, marked redness, or unusual pain require urgent assessment
Bleeding or small bruise at the injection site
Temporary increased pain after injection, especially after corticosteroids
Allergic reaction to the substance — uncommon
With corticosteroids: skin colour changes, local fat thinning, temporary blood-sugar rise in some patients
With PRP: local pain, swelling, redness
Temporary worsening of symptoms before any improvement — seen in a minority of patients

The process — what to expect

Before injection

Orthopedic examination and review of imaging if available
Discussion of alternatives — physiotherapy, medication, activity change
Explanation of injection type, risks, and allowed frequency
Update on regular medications (blood thinners, diabetes, etc.)

During injection

Skin cleaning and sometimes local anaesthetic
Targeted injection into the relevant area
Short procedure — usually a few minutes

After injection

Relative rest on the first day; avoid heavy loading as advised
Local cooling if uncomfortable
Gradual return to activity based on response — no single timeline fits everyone
Follow-up if there is no improvement or symptoms worsen

Injection as part of a broader treatment plan

In mainstream orthopedic practice, injection is a step — not the destination. In osteoarthritis, load management, strengthening, and weight reduction when needed are usually the foundation. Activity adaptation as well; injection may add value when relief is needed to progress.

In tendinopathy, structural rehabilitation — eccentric exercise, technique correction, load management — is the backbone. Injection, when considered, sits alongside that, not instead of it.

When surgery is indicated — instability, full tear, advanced arthritis with major functional limitation — repeated injections in hope of delaying the inevitable are not useful.

The decision is always personal: age, goals, prior treatments, background conditions, and expectations all matter.

Frequently asked questions

Does it hurt?

Most patients describe brief pressure or a sharp sting during the injection. Some have increased soreness for a day or two afterward, especially after corticosteroids. Local anaesthetic or pain relief may be used beforehand, depending on the joint and injection type.

How long until improvement is felt?

That varies by injection type, joint, and condition. Some patients report relief within a few days; others only after weeks. Sometimes there is no meaningful improvement, and the diagnosis and treatment plan should be reassessed rather than repeating the same approach automatically.

How many injections can someone receive?

There is no single number for everyone. Corticosteroid injections have frequency limits because of cumulative side effects, so they are usually not repeated too often into the same joint. Hyaluronic acid and PRP are decided case by case based on response and clinical judgment, not a fixed package.

Does an injection replace surgery?

No. Injections are one tool within a broader plan. When there is major structural damage, instability, or advanced arthritis that does not respond to conservative care, surgery or other options may be more appropriate. The decision depends on examination, imaging, and symptoms — not on the injection type alone.

What is the difference between corticosteroids, hyaluronic acid, and PRP?

Corticosteroids mainly reduce inflammation and may ease pain in the short to medium term, with limits on how often they can be used. Hyaluronic acid is used for joint lubrication, mainly in osteoarthritis, with debated long-term evidence. PRP uses the patient's own platelets; some studies are encouraging in selected conditions, but results are inconsistent and it is not suitable for every case.

Is it suitable for every type of arthritis?

No. Injections are mainly considered for mild to moderate osteoarthritis and selected inflammatory conditions. In very advanced disease, when the joint is already severely damaged, the chance of benefit is limited and other options may be preferable.

Is a referral required?

In a private clinic you can contact the office directly for a consultation. If supplementary insurance or another payer requires a referral, check with them in advance. In any case, bring summaries, imaging, and a medication list if available.

Who should not receive an injection?

Injection is not appropriate when there is active infection in the joint or overlying skin, suspected untreated fracture, or a condition that the treatment might worsen. Allergy to a specific substance, certain medications, poorly controlled diabetes, or some systemic diseases may also change the decision. Examination is required before every injection.

The choice between injection, physiotherapy, conservative care, or surgery depends on the specific case — diagnosis, structure, symptoms, and what has already been tried. If you are unsure, a clinic consultation allows review of the situation and a structured plan.

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