Joint Injections — What the Evidence Shows

Injections occupy a strange place in musculoskeletal care. They are enormously common, they genuinely help a great many people, and the published evidence for several of them is thinner and shorter-lived than most patients are led to believe.

Most of what is written about them online comes from practices that sell them. These pages are written by someone who performs them, which is a different thing — it means being able to say both that they work and where they stop working.

Where are you with this?

These eleven pages follow the sequence a decision actually moves through. Start where you are.

Before you decide anything

The option with the best evidence is the one least often delivered properly.

Conservative care first What it actually involves, and the evidence held to the same standard as the injections. When injections are not the answer Mechanical rather than inflammatory pain, pain from somewhere else, and presentations needing a workup instead.

Understanding the options

What each one does, and what the trials actually found.

Corticosteroid injections, explained What a cortisone shot does, the measured time-course of relief, and an honest reading of the cartilage evidence. Hyaluronic acid injections The injection clinicians disagree about most, and why a small inconsistent effect allows that. PRP — what the evidence says Pooled analyses rank it first. The largest rigorous trial found nothing.

For your joint

The decision looks different at the knee than at the shoulder.

Knee injections compared Three options side by side, and why ranking by effect size inverts ranking by evidence quality. Shoulder injections compared Four targets rather than one, and what the largest rotator cuff trial found.

Having one

What the appointment is actually like, and how it is done.

What to expect during a joint injection The procedure in order, and the blood thinner question most people get wrong. Ultrasound-guided vs. landmark injection One in five blind knee injections misses. Whether that changes the result is the harder question.

Afterwards

What is expected, what is not, and when to ask again.

Cortisone flare and side effects Why the joint often hurts more the first night, and how to tell a flare from the rare complication. How often can you get a cortisone shot? Where the three-month rule comes from, and why hips and knees differ before surgery.

How these pages handle evidence

Where a claim rests on a trial or a systematic review, it is cited and the finding is reported as the authors reported it — including when the finding is unhelpful to the procedure. Where I am describing clinical judgment rather than published data, it is labelled as such.

That distinction matters more here than it did for the rehabilitation pages. Coverage rules are a matter of record. Whether a given injection helps a given person is a question the literature answers with real uncertainty, and pretending otherwise would be the easiest way to make these pages useless.

Content here is general education about injection procedures and the evidence behind them. It is not medical advice, does not create a patient–provider relationship, and is not a substitute for evaluation by your own clinician. See the editorial policy for how this content is written, sourced, and corrected.