Can a Cortisone Shot Help a Torn Meniscus?

A cortisone shot can reduce pain from a torn meniscus, but the relief is temporary and comes with trade-offs that matter more than many patients realize. In one study, ultrasound-guided cortisone injections targeted at meniscal tears provided an average of roughly six weeks of meaningful pain relief. No research has shown that cortisone heals or repairs the torn tissue itself. The decision to get the shot depends on what you need it to do, how your knee looks structurally, and what treatment you plan next.

How Much Relief You Can Actually Expect

Cortisone is a potent anti-inflammatory, and a torn meniscus often involves local inflammation and swelling that amplifies pain beyond what the tear alone would cause. When injected into the knee joint, the steroid quiets that inflammatory cascade, which is why many people feel noticeably better within a few days. A retrospective study of ultrasound-guided meniscus-targeted corticosteroid injections found that patients experienced an average of about five to six weeks of pain relief, with a statistically significant drop in pain scores between the initial visit and follow-up.¹

That roughly six-week window is useful but not transformative. It can get you through a flare-up, let you participate in physical therapy with less pain, or buy time while you decide whether surgery makes sense. A systematic review of injectable therapies for meniscal tears confirmed this general picture: corticosteroids provided short-term symptom relief without any structural benefit to the meniscus itself.² In other words, the shot treats the symptom, not the problem. Your meniscus looks the same on MRI afterward.

What Cortisone Does to the Meniscus and Cartilage

The concern with cortisone in the knee goes beyond “it wears off.” There is growing evidence that injections may temporarily accelerate tissue loss. A controlled study found that people who received an intra-articular corticosteroid injection experienced a significantly greater rate of meniscal thickness loss in the medial compartment during the year of injection compared to matched controls who did not receive one.³ This thinning was transient: in the years after the injection, the rate of loss returned to baseline. But the cumulative thickness lost during the treatment period was not recovered. If you already have a torn or degenerating meniscus, that extra thinning is not trivial.

The cartilage lining the bones of your knee joint faces similar risks. A systematic review of in-vivo and in-vitro studies found that at higher cumulative doses, corticosteroids were associated with gross cartilage damage and toxicity to the cells that maintain cartilage.⁴ A single, appropriately dosed injection may not cross that threshold. But repeated injections can accumulate.

A large observational study using data from the Osteoarthritis Initiative tracked patients who initiated corticosteroid injections against matched comparators. Those who started injections were about three times more likely to show worsening of radiographic osteoarthritis, and those who received continuous injections over time had an even higher risk of progression.⁵ Observational data like this cannot prove that cortisone caused the worsening; sicker knees get more injections, which creates a selection bias. But the pattern is consistent enough that most orthopedists now limit how often they offer cortisone to the same knee.

Physical Therapy Often Beats the Shot at One Year

If your meniscal tear coexists with knee osteoarthritis, and most degenerative meniscal tears do, the comparison between a cortisone shot and a course of physical therapy looks increasingly one-sided. A multi-center randomized trial assigned patients with both meniscal tears and knee osteoarthritis to either a glucocorticoid injection or a structured physical therapy program. At one year, the physical therapy group scored substantially better on the standard knee function questionnaire, with a mean difference of roughly 23 points in favor of therapy. The PT group also showed markedly better proprioception, the body’s ability to sense the position and movement of the knee joint.⁶

This makes intuitive sense. Physical therapy strengthens the muscles that support the joint, improves range of motion, and teaches movement patterns that reduce stress on the damaged meniscus. Cortisone does none of those things. The injection can make therapy more tolerable in the short term, though, so the two approaches are not always either/or. Some clinicians use a cortisone shot as a bridge: it dials down the pain enough for you to do your exercises, then the exercise does the actual long-term work.

Timing Matters If Surgery Is Next

For people considering arthroscopic surgery to trim or repair a meniscal tear, the timing of a cortisone injection before that surgery is a real safety issue. Corticosteroids suppress local immune defenses, and operating on a knee that recently received one raises the risk of postoperative infection. The window of risk has been studied in several large datasets.

One study found that patients who received a cortisone injection within two weeks of knee arthroscopy had a postoperative infection rate of about 7%, compared to roughly 2% in patients who did not receive an injection. The risk of infection severe enough to require surgical treatment was about five times higher in that two-week window.⁷ Another study, focused specifically on arthroscopic meniscectomy, found that injections within one month of surgery roughly doubled the infection rate compared to no injection. Injections given more than one month before surgery, however, were not associated with a significant increase in risk.⁸

A third study examining the perioperative period found that patients receiving injections either preoperatively or during surgery experienced a 3% and 2.6% infection rate, respectively, compared to 1.4% in patients who received them only postoperatively.⁹ The practical takeaway is straightforward: if you think you might end up having knee surgery, tell your surgeon before getting a cortisone shot, and expect to wait at least a month between the injection and any procedure.

Long-Term Risk of Joint Replacement

Beyond the issue of cartilage thinning in imaging studies, there is data connecting cortisone injections to a higher likelihood of eventually needing a knee replacement. A study following nearly 4,000 patients found that about 31% of those who received corticosteroid injections went on to have knee arthroplasty, compared to 5% of those who did not. After adjusting for baseline differences through matching, the hazard ratio was roughly 1.6, with each injection adding about a 9% absolute increase in the risk of arthroplasty over nine years of follow-up.¹⁰

This kind of finding needs careful interpretation. People who get cortisone shots tend to have worse knees to begin with, and propensity matching cannot fully eliminate that bias. Still, the size of the association is hard to dismiss entirely. It reinforces the idea that cortisone should be viewed as an occasional tool, not a repeated maintenance strategy.

Blood Sugar Spikes and Other Systemic Effects

A cortisone shot into the knee is a local treatment, but the steroid does not stay entirely local. Some of it absorbs into the bloodstream, which can cause systemic effects. The most clinically relevant one is a transient spike in blood glucose levels, a particular concern if you have diabetes.

A study of diabetic patients receiving corticosteroid injections found that blood glucose rose significantly on the first day after the shot, with the increase much larger in patients whose diabetes was poorly controlled. Those with higher baseline hemoglobin A1c levels saw bigger spikes and took longer to return to normal.¹¹ In another study, patients with well-controlled diabetes (A1c under 7%) saw an average glucose rise of about 38 mg/dL, while poorly controlled patients experienced a spike averaging about 98 mg/dL. The well-controlled group returned to near-baseline around eight days post-injection, while the poorly controlled group’s levels stayed elevated longer.¹² Peak glucose levels in some cases have been documented near 300 mg/dL.¹³

If you have diabetes, the injection is not off the table, but you and your doctor should plan for it: extra glucose monitoring for at least a week, possible insulin adjustments, and awareness that the spike can be substantial. Other less common systemic effects include a temporary facial flushing, mild mood changes, and a brief suppression of the body’s own cortisol production. These typically resolve within days to a couple of weeks.

What Gets Mixed into the Syringe

Cortisone injections do not always contain cortisone alone. Clinicians frequently add a local anesthetic like lidocaine or bupivacaine to the same syringe for immediate pain relief during the procedure. That combination is so routine that many patients do not even know they received two drugs. But research suggests the combination may be worse for cartilage cells than either drug alone. Two in-vitro studies using human cartilage found that corticosteroids mixed with local anesthetics produced significant time-dependent toxicity to chondrocytes, the cells responsible for maintaining cartilage.¹⁴ Lab studies do not directly translate to clinical outcomes, and the concentrations used in experiments may differ from what ends up in your knee. But the finding is another reason not to treat cortisone injections as completely benign.

Returning to Activity After the Shot

One of the most appealing things about a cortisone shot is that it lets you move more freely, sometimes within days. For recreational athletes, that quick relief can feel like a green light to return to full activity. That impulse deserves caution. A study of triathletes who received corticosteroid injections for knee pain noted that the pain-masking effect of the steroid may make athletes more vulnerable to tissue overload and failure. The steroid’s effects on tissue can persist for up to three months, and most of the triathletes in the study returned to sport within two weeks, potentially putting themselves at risk.¹⁵

The underlying problem is that pain serves a protective function. It stops you from loading a damaged structure beyond what it can tolerate. When cortisone removes that signal but does nothing to strengthen or heal the tissue, you can unknowingly push a partially torn meniscus into a bigger tear, or accelerate cartilage wear. A more measured approach is to use the pain-free window for guided rehabilitation rather than jumping straight back to high-impact activity.

Platelet-Rich Plasma as a Competing Option

If you have been researching injection options, you have probably come across platelet-rich plasma, commonly called PRP. PRP is made from your own blood: a sample is drawn, spun down to concentrate the platelets, and then injected into the knee. The theory is that growth factors in the platelets may promote tissue repair in a way cortisone cannot.

A narrative review of PRP for meniscal injuries found that in studies with follow-up periods under one year, PRP showed significant improvements in knee symptoms and daily activity, with MRI scans suggesting stable meniscus conditions at six months. However, studies following patients beyond one year did not find significant differences between PRP-treated groups and controls in terms of pain or knee function.¹⁶ So PRP may offer a somewhat longer initial benefit than cortisone and carries fewer concerns about cartilage toxicity, but the long-term case for it remains unproven. It is also rarely covered by insurance, which puts the cost burden squarely on the patient.

How Injection Accuracy Changes the Outcome

A standard cortisone injection for knee pain is often delivered blindly into the general joint space. The clinician feels for anatomical landmarks, inserts the needle, and injects. For a torn meniscus specifically, there is reason to think that where the medication lands matters. Ultrasound-guided injection techniques allow clinicians to direct the needle to the meniscal wall itself, placing the steroid closer to the source of inflammation. A technical description of this approach argued that ultrasound-guided infiltration of the meniscal wall is more targeted and more effective on the trigger zone than blind injection into the joint cavity.¹⁷

Not every clinic offers ultrasound guidance, and the additional cost and time may not always be justified. But if you have had a blind injection that did not help much, a guided injection might be worth trying before concluding that cortisone is not useful for your knee. It is also worth asking about simply because the accuracy of blind knee injections is lower than most patients assume; missing the joint space entirely is not rare, and an injection that lands in the surrounding fat pad or soft tissue will not do what it was intended to do.

Who Gets the Most Out of a Cortisone Shot

Not every torn meniscus is the same, and the people who benefit most from cortisone tend to share a few characteristics. A large, acutely inflamed knee with an effusion (visible swelling from fluid buildup) tends to respond better because the steroid is addressing genuine inflammation, not just chronic mechanical pain. Degenerative tears in older adults, where the meniscus is fraying rather than acutely torn, may respond less dramatically because the primary pain driver is often mechanical catching or instability rather than inflammation alone.

People who are trying to delay or avoid surgery also tend to be reasonable candidates, provided the injection is used strategically alongside exercise and weight management rather than as a standalone fix. If you are young, active, and have a traumatic bucket-handle tear that locks your knee, cortisone is unlikely to solve your problem. That type of tear often needs surgical repair to restore mechanical function.

Age, activity level, the type and location of the tear, the degree of accompanying arthritis, and your goals all factor into the decision. A cortisone shot is a real medical tool with real benefits for certain patients at certain moments. The problems arise when it is treated as a default or repeated without a broader plan.