How Long Does a Cortisone Shot Last in Your Knee?

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“How long does a cortisone shot last?” is the question I hear more than almost any other in clinic.

I am Dr. Cory Calendine, a board-certified, fellowship-trained orthopaedic surgeon at the Bone and Joint Institute of Tennessee in Franklin. I have spent more than twenty years caring for hip and knee arthritis and perform over 700 joint replacements a year. Long before most of those patients ever reach an operating room, they sit across the desk from me asking about a shot.

Here is what I tell them. The honest answer is a range, not a number. Some patients feel dramatically better for a day. Some ride a good month. Some get several strong months out of a single corticosteroid joint injection.

If someone quoted you a specific number of weeks and your knee did not deliver, the shot was not the problem. The promise was.

How long does a cortisone shot last in your knee?

A cortisone shot in the knee lasts anywhere from one day to several months. There is no fixed number of weeks that applies to everyone.

In my practice, cortisone helps as many as nine out of ten patients with knee arthritis. How long that help holds is the part no one can predict in advance.

The spread is genuinely wide:

• A day or two. Uncommon, but it happens, and it usually tells me something about the joint.
• One to three weeks. Enough to get through a trip, a wedding, or a hard stretch at work.
• Six to twelve weeks. The most common window I see in the office.
• Three to six months or longer. Very possible, especially when inflammation is driving most of the pain.

I have watched two patients with nearly identical knee X-rays get completely different results from the same medicine on the same afternoon. That is not one of them doing something wrong. That is just how this works.

How long does a cortisone shot last in the hip or shoulder?

The same range applies, and large joints tend to hold relief a little longer than small ones. Knees, hips, and shoulders generally do better than the small joints of the hand or foot, where the medicine has less room to work and the joint gets used constantly.

The hip is deeper than the knee, so I often use image guidance to place the medicine precisely. Accuracy matters. A shot that does not reach the joint space cannot do its job.

How soon does a cortisone shot start working?

Most patients feel a cortisone shot begin to work within 24 to 72 hours, and the strongest relief usually arrives around day five to seven.

There is a wrinkle worth understanding. I mix the steroid with a numbing medicine, so many patients walk out of the office feeling wonderful for a few hours. That is the anesthetic, not the cortisone. When it wears off that evening, the old pain often comes back.

Do not panic. The cortisone has not failed. It has not started yet.

Is it normal for the joint to hurt more for a day or two?

Yes. A short flare of increased pain and stiffness in the first 24 to 48 hours is common and expected. The body sometimes ramps its inflammatory response up briefly before the steroid quiets it down.

Ice the joint, keep activity light, and give it time. What I do want to hear about is fever, spreading redness, or swelling that gets worse instead of better after two days. Those are rare, and they earn a phone call the same day.

Why does relief last months for one patient and a week for another?

Five things drive how long a cortisone shot lasts, and most of them have nothing to do with the injection itself.

1. How advanced the arthritis is. The more worn the joint, the harder the medicine has to work, and the shorter it tends to hold.
2. How much of the pain is inflammatory. When a joint is hot, swollen, and flared, cortisone quiets it hard and the relief can feel dramatic. When the pain is mechanical, meaning bone rubbing on bone, cortisone has less to grab onto.
3. How hard you work the joint. A quiet week lets the injection settle in. A weekend of ladders, hills, and concrete floors burns through it faster.
4. Your own biology. Two patients, same X-ray, same medicine, very different answers. Nobody can reliably predict who gets the day and who gets the six months.
5. Where the medicine lands. A well-placed injection reaches the joint space it needs to reach. Ultrasound or fluoroscopic guidance helps in a difficult joint.

How often can you get a cortisone shot in the same joint?

A common, sensible routine is up to about three cortisone injections per year in the same joint. For most patients, that is a useful cadence: enough to buy real time when a flare hits, without stacking risk on the joint.

Notice what that is not. It is not a standing appointment.

The next shot is driven by your pain, not by the calendar. If an injection bought you three good months and the ache is creeping back, that is a fair point to talk about another one. If it bought you a week and you are back the following Tuesday, that is information too. It tells me the tool is running out of runway and the plan needs to widen.

What the research says about repeated steroid injections

Cortisone is a real tool. It is not a free one.

In a two-year randomized trial published in JAMA, patients who received an intra-articular triamcinolone (a steroid) injection every twelve weeks lost significantly more knee cartilage volume than patients who received saline, with no better pain relief over that period (McAlindon et al., 2017).

That study is a big part of why I do not hand these out endlessly, and why I am direct with patients about the ceiling. The American Academy of Orthopaedic Surgeons patient overview takes the same position. For the evidence-graded look at all four common knee injections, see my article on knee injections for arthritis: what works, what doesn’t, and what’s worth it.

What should you do in the first week after a cortisone shot?

Keep the first 48 hours quiet, then get moving. That order matters.

• Day one and two: ice for fifteen minutes a few times a day, skip high-impact activity, and expect the numbing medicine to wear off.
• Day three to seven: ease back into walking and your strengthening exercises as the joint calms down.
• Once you feel good: use the window. This is the right time to build quad strength, work on nonsurgical joint pain treatment habits, and take weight off the joint if that applies to you.
• If you have diabetes: check your blood sugar more closely for about five days. Steroids raise it temporarily.

Patients who use the good weeks to get stronger tend to stretch the relief further than patients who simply enjoy them. That is the single most useful thing I can tell you about making a shot last.

What does it mean when a cortisone shot stops working?

It means the joint has changed, not that you have failed. Over time, shots often last shorter and shorter stretches. That usually reflects the arthritis progressing rather than your body building tolerance to the medicine.

That is the point where the conversation moves up the ladder:

• Hyaluronic acid, the “gel” injection. Helps some patients, particularly when cartilage is still present.
• PRP (platelet-rich plasma). Helps some patients, and the evidence is genuinely mixed. Ask exactly which preparation you are getting and what it costs.
• The daily basics. Movement, strengthening, weight management, and the right anti-inflammatory when it is safe for you.
• Joint replacement. When nonsurgical care stops protecting the life you want, the replacement conversation belongs on the table. I frame that as a quality-of-life decision, never a pain-endurance test.

Cortisone should be one tool in a plan, not the plan

This is the part I get a little worked up about.

If a clinic is running you through a steroid injection every eight weeks, forever, that is not a treatment plan. That is a shot on a subscription.

A real plan pairs the injection with the things that actually change how the joint feels day to day: strength, movement, weight, and the right medication when it is safe for you. The shot buys the window. The work you do inside that window is what carries you. My guide to treating hip and knee arthritis without surgery lays out what that looks like week to week.

Talk with an orthopaedic surgeon in Franklin, Nashville, or Columbia

If your shots are not lasting the way they used to, or you are being offered one and want a straight answer first, come see me.

I see patients from Franklin, Brentwood, Nashville, Columbia, Spring Hill, and across Middle Tennessee at the Bone and Joint Institute of Tennessee, 3000 Edward Curd Lane, Franklin, TN 37067. You can reach the office at (615) 791-2630 or request an appointment with Dr. Calendine online.

Bring the timeline with you. How long the last shot lasted, and what you were doing when it wore off, tells me more than any single image ever will.

Medical disclaimer: This article reflects Dr. Calendine’s independent clinical perspective and is for general education only. It is not a substitute for advice from your own physician or orthopaedic surgeon. Medication information here is general and does not include dosing. Individual results vary. Always confirm what is safe for you with your own doctor.

References

• McAlindon TE, LaValley MP, Harvey WF, et al. Effect of Intra-articular Triamcinolone vs Saline on Knee Cartilage Volume and Pain in Patients With Knee Osteoarthritis: A Randomized Clinical Trial. JAMA. 2017;317(19):1967-1975. PMID 28510679.