How Long to Wait for Hip Replacement After Cortisone?

Most surgeons ask you to wait at least 3 months after a cortisone shot in a hip before replacing that same hip.¹ Surgery sooner than that carries a clearly higher chance of infection in the new joint.² The rule exists to protect the operation, not because the shot was a mistake, and with some planning you can usually have both.

What the Evidence Shows About Timing

Across many pooled studies, people who had a hip shot within 3 months before replacement had about 1.6 times the infection risk of people with no shot.³ In one large hospital’s records, a shot within 3 months more than doubled the chance of infection in the new joint.⁴ People whose surgery came 3 to 6 months after the shot showed no clear extra risk.⁵

Three months is roughly where studies stop finding a clear jump in risk, so it works as a practical safety margin and not a magic switch. A surgeon may ask for longer if you have other infection risks, so ask what their own rule is.

Closer to surgery is worse. A shot within 1 month of surgery carried roughly double the odds of infection, while a shot about 4 months before carried only about a quarter more.⁶ Some pooled data still show a small rise, about 20%, for any shot within the past year.⁷

A figure like 1.6 times describes how much larger the chance is compared with people who had no shot, not the chance itself. Because the starting chance of infection is low, even a sizeable multiplier leaves the absolute chance fairly small. In one large group, infection by 6 months after surgery was 1.6% with a shot in the prior 4 months versus 1.1% without.⁸ Most people who have surgery soon after a shot do not get infected, but the chance is noticeably higher.

The rule applies to the same hip. The concern is a shot into the joint being replaced. A shot in your other hip is a separate question to raise with your surgeon. Tell your surgeon about every joint shot you’ve had in the past year, with dates.

Why a Cortisone Shot Raises Infection Risk

Infection of the new artificial joint is one of the most serious problems after hip replacement. Cortisone works by turning down inflammation inside the joint, lowering the immune signals that drive swelling.⁹ That same dampening can leave the joint less able to deal with bacteria.

The effect is not entirely local. Some of the drug is absorbed into the bloodstream and travels around the body, so some immune cells throughout the body are suppressed for about 48 hours after a joint shot, and immune messenger chemicals for more than 4 days.¹⁰ The changes are usually brief: the drug leaves the bloodstream and the changes resolve as it clears.¹¹ The exact reason the risk lasts about 3 months isn’t fully explained, which is why surgeons rely on the timing data.

Cortisone can also raise blood sugar and blood pressure for a while after a shot.¹² Raised blood sugar matters more if you have diabetes, and high blood sugar around surgery is itself linked to wound problems. Tell your care team about a recent shot so they can check your sugar.

The needle plays a part too. Any needle that enters a joint carries a small chance of bringing bacteria in from the skin, which is why the skin is cleaned beforehand. With the local immune response turned down, the joint may cope less well with any that get in. The shot is not the surgery, but both enter the same space, so the two risks can add together.

Surgeons stay cautious even about small rises because an infected implant can be hard to clear with antibiotics alone. It can mean further operations and a long recovery.

Does Having More Than One Shot Change the Wait

Risk climbs with each shot. People who had several hip shots before replacement had an infection rate of 6.6%, against 2.0% for those with one shot.¹³ Each additional shot in the 3 months before surgery raised the odds of infection further, and the same pattern held for wound infections at the incision.¹⁴

If you’ve had repeated shots, a longer gap and a frank talk with your surgeon make sense. Some surgeons ask for more than the usual 3 months, though there is no single agreed figure. The right gap depends on how many shots you had, how recent the last was, and your other health conditions, so ask how long they would like you to wait in your case.

Think carefully before one more shot when surgery is likely. A new shot restarts the 3-month clock, so if surgery is within a few months, a shot may delay it. Weigh short relief against a later or riskier operation, and ask whether a non-steroid option could bridge the gap.

Other Hip Injections and the Waiting Rule

Cortisone is not the only injection that has been linked to infection. In one group, people who had hyaluronic acid gel shots in the 6 months before hip replacement had more infections of the new joint, 4% versus none.¹⁵ Wound infections were also higher, 9% versus 3%.¹⁶ Tell your surgeon about any hip injection, not just steroids.

Gel shots contain no steroid, so the immune explanation for cortisone does not apply to them in the same way. The finding came from one group and rests on few people, but surgeons commonly ask about any joint injection in the months before replacement.

Many hip shots combine a local anaesthetic with a steroid. The steroid part is what the timing rule targets. If you’re unsure what you got, ask the clinic that gave it.

Keyhole surgery is different. For hip arthroscopy, a smaller keyhole operation, a shot within 3 months did not change infection rates.¹⁷ The waiting rule is mainly about replacement, where an implant is placed.

How Long a Shot’s Relief Usually Lasts

Relief usually begins 3 to 5 days after the shot and can keep building for 2 to 3 weeks.¹⁸ You may not notice much in the first day or two. Some people feel soreness at the injection site for a day or so, which can be mistaken for the shot failing, so judge the effect after 2 to 3 weeks rather than the first few days.

Benefits are large in the short term but usually don’t last beyond 3 months.¹⁹ In one group, relief averaged about 6 weeks.²⁰ An average hides big differences: some people get much less and some more. About 1 in 6 people got no satisfaction from the shot, and over 4 in 10 said they wouldn’t have another.²¹

Hip shots don’t meaningfully delay the need for hip replacement.²² They also add costs, since hip shots need imaging guidance and extra appointments.²³

If you’re on a waiting list, plan the shot date with the surgery date in mind. Relief ending near the 3-month mark can leave a painful gap. If surgery is already set within 3 months, a shot is usually avoided. Discuss this before booking either one.

Managing Hip Pain While You Wait

People with hip arthritis waiting for replacement generally don’t get noticeably worse or better in pain, stiffness, or function during the wait.²⁴ A sudden change from your usual pattern is what to report. Call your surgeon for sudden severe worsening of pain, fever or redness around the hip, or a rapid loss of ability to walk, which may move surgery up.

Taking anti-inflammatory pills such as naproxen daily improved pain and daily activity for people waiting for hip replacement.²⁵ These pills aren’t suitable for everyone, including people with stomach ulcers or some kinds of asthma.²⁶ Ask your doctor whether a regular anti-inflammatory is safe for you.

Everyday measures help too. Gentle exercise or physiotherapy keeps strength for recovery, and losing some weight reduces load on the hip. Paracetamol can be combined with other approaches if your doctor agrees.

A cane helps when held in the hand opposite the sore hip, so it moves forward together with the painful leg. Its top should reach about the crease of your wrist when your arm hangs at your side. Used this way it takes some load off the hip, and a physiotherapist can check the fit.

If You Had a Shot Recently and Surgery Is Booked

If your surgery date falls within 3 months of a shot in that hip, call the surgeon’s office as soon as you realise, because risk is highest when surgery follows within a month of the shot.²⁷²⁸ Find the date of your shot and the date of your operation, then work out the gap. Call with both dates and the hip involved instead of waiting for your next appointment. Don’t cancel the surgery yourself; the surgical team decides whether to proceed.

The conversation covers the exact date and type of the shot, and whether moving surgery a few weeks is possible. It also covers your other infection risks, like diabetes or smoking, and weighs a short delay against your pain and the waiting list.

You can lower infection risk in other ways as well. Control your blood sugar before surgery, stop smoking if you can, and treat any skin or dental infection first.