Cortisone injections for foot pain, explained by the person holding the syringe.

What is actually in the syringe

In my practice, a typical foot injection is a 3 cc mixture:

• 2.5 cc of lidocaine 1%, always plain (no epinephrine) for foot injections. The lidocaine numbs the area within minutes, which does two jobs at once: it makes the injection tolerable, and it acts as a built-in diagnostic test. If the pain melts away while the anesthetic is working, we have confirmed the target.
• 0.5 cc of Kenalog-10 (triamcinolone acetonide, 10 mg/mL, so 5 mg). This is the corticosteroid, the actual anti-inflammatory medicine. It does not work instantly; it quiets inflammation over days.

Sometimes I use a variation: 2.5 cc of plain lidocaine 1% with 0.25 cc of dexamethasone (4 mg/mL) plus 0.25 cc of Kenalog-10 in the same 3 cc total. The pharmacology behind mixing two steroids is straightforward: dexamethasone is a soluble (non-particulate) steroid that absorbs and starts working quickly, while triamcinolone is a particulate steroid that dissolves slowly and lasts longer in the tissue. Together they cover both the early days and the following weeks.

Every clinician has their own recipe, and yours may reasonably use different drugs, doses, or volumes. The pattern is what matters: fast-acting numbing plus slow-acting anti-inflammatory, in a small volume appropriate to a foot-sized target.

What other clinicians use

It is fair to ask whether my cocktail is typical. It is. The three common injectable steroids are methylprednisolone (Depo-Medrol), the most-used one for joints in the US, triamcinolone (Kenalog, what I use), and betamethasone (Celestone). Published foot-injection references land in the same territory: a local anesthetic (lidocaine or bupivacaine, always plain in the foot) plus one of those steroids, in comparable volumes. My doses sit on the conservative end of that range.

What is genuinely consistent across the literature is the caution, not the recipe. The plantar fascia and, above all, the Achilles are flagged as the highest-risk soft-tissue sites for rupture. That is not a personal quirk of mine; it is why I inject the fascia sparingly and the Achilles never.

Where injections genuinely help

The big toe joint (1st MTP arthritis and hallux rigidus)

The joint at the base of the big toe is one of the most arthritis-prone joints in the foot, and it sits just under the skin, which makes it a good injection target. A steroid injection here can settle an inflamed, stiff, aching joint for a meaningful stretch of time, enough to walk, work, and sleep comfortably. It does not regrow cartilage or remove the bone spurs that limit motion, so for advancing arthritis it is a symptom-control tool while the bigger plan (shoe modifications, stiff-soled shoes or plates, and eventually surgical options) is sorted out.

Midfoot (midtarsal) arthritis

Arthritis in the middle of the foot produces a deep ache across the top of the arch that flares with standing and walking. These small joints respond well to a precisely placed injection, and because several joints crowd together here, the lidocaine's numbing effect doubles as confirmation that we treated the joint actually causing the pain.

Plantar fasciitis (the honest version)

The plantar fascia is probably the most-requested foot injection, and it is the one where framing matters most. The averaged trial data is modest: a Cochrane review pooling 39 trials and nearly 2,500 adults found steroid injections reduce heel pain only slightly, and mostly for about a month. But an average across trials does not capture how the injection is meant to be used, and it does not match what I see when it is used well.

I never tell a patient the shot is a cure. I tell them the truth as I understand it: stretching the calf and the fascia is what actually cures plantar fasciitis, and the injection is a bandaid that opens a pain-free window so they can finally do that stretching consistently. Pain is what stops people from stretching; take the pain away for a few weeks and the stretching gets done. Used that way, I have seen it far outperform the trial averages, patients who become completely pain-free after two or three injections spaced across a year alongside a committed stretching routine. The shot did not heal the fascia on its own. It bought the window that let the stretching heal it.

That is also why I cap it at three injections a year, the conservative end of the common three-to-four-per-year guidance, and why the part I hammer on with every patient is the stretching, not the needle.

Morton's neuroma

A neuroma is an irritated, thickened nerve between the metatarsals, and an injection placed into that interspace can calm the nerve and quiet the burning, "pebble in the shoe" pain. The short-term evidence is encouraging, with the best relief in the first weeks to months, and a single well-placed injection helps a lot of people. Two honest caveats belong here: the relief is often temporary, and the forefoot fat pad is vulnerable, so repeated neuroma injections carry a real risk of fat pad atrophy (even a single injection can thin it a little). That is why I do not stack these; a neuroma that keeps flaring usually needs a wider metatarsal pad, roomier shoes, and sometimes a different procedure, not an endless series of shots.

The ankle joint: arthritis and osteochondral lesions

The ankle (tibiotalar) joint responds to the same targeted anti-inflammatory logic. For ankle arthritis, an intra-articular injection can settle a deep, stiff, aching joint enough to walk and work while the longer plan (bracing, footwear, activity changes) does its part. For an osteochondral lesion (OCD) of the talus, often a legacy of an old ankle sprain, an injection is a symptom tool, not a repair: it can quiet the joint's inflammation and pain, but it does not heal the cartilage defect itself, so it is one piece of a plan that may eventually involve imaging and a surgical opinion.

Sinus tarsi

The sinus tarsi is the small tunnel on the outer side of the foot, just in front of the ankle, and it is a classic source of stubborn lateral hindfoot pain after a sprain or in a flat, rolled-in foot. An injection here is one of my favorites because it does double duty: the local anesthetic confirms the diagnosis on the spot (if the pain goes quiet, the sinus tarsi was the source), and the steroid settles the inflammation. It is one of the more reliably satisfying injections in the foot.

The one place I refuse to inject

I do not inject the Achilles tendon. At all. Corticosteroid weakens collagen while it calms inflammation, and in a tendon that already carries several times body weight with every step, that tradeoff can end in a complete rupture, a genuinely life-altering injury with months of recovery. Steroid injection near the Achilles is a recognized rupture risk factor, and it is listed as exactly that on our Achilles tendinitis page. For Achilles problems, the effective tools are progressive loading exercise, heel lifts, footwear changes, and patience. A clinician offering to inject steroid directly into your Achilles is a reason to ask careful questions, or to get a second opinion.

What getting one is actually like

• The injection itself takes seconds. Foot injections are more sensitive than an arm vaccine because the foot is densely innervated; the plantar fascia is the most uncomfortable of the common sites. It is brief.
• First few hours: the area often feels strangely good, that is the lidocaine. When it wears off the original pain can return temporarily; do not judge the injection by day one.
• Post-injection flare: a minority of patients (a few percent) get more sore for a day or two as the steroid crystals settle in. Ice and time settle it. This is expected and not a complication.
• Days 3 to 7: this is when the steroid does its work and the real result declares itself.
• If you have diabetes: expect a modest, temporary rise in blood glucose for several days after a steroid injection. Published measurements show small average bumps, but the effect varies, so watch your numbers a little more closely that week and loop in whoever manages your diabetes if readings run unusually high.

The honest risk list

Serious problems from foot steroid injections are uncommon, but "uncommon" is not "never," and you should hear the list before the needle, not after:

• Plantar fascia rupture, the signature risk of repeated fascia injections. Steroid weakens the very tissue being treated; a rupture trades heel pain for a longer, harder problem. This is a core reason injections are spaced out and not repeated casually.
• Fat pad atrophy: the heel's natural shock-absorbing fat pad can thin if steroid ends up in it, and it does not grow back. Careful placement matters more than anything here.
• Skin changes: lightening of skin color (hypopigmentation) or a small divot of thinned skin at the injection site, more visible on darker skin tones.
• Infection: rare with sterile technique, but any injection creates a path through the skin. Increasing pain, redness, or fever afterward warrants a same-day call.
• Transient effects: the post-injection flare and the temporary glucose rise described above.

Frequency limits are part of risk management. The common guardrail is no more than three or four injections into the same site per year, spaced at least about three months apart; I keep to three. A joint or fascia that keeps demanding injections is telling you the underlying plan needs to change, not that it needs another shot.

When an injection is the wrong tool

• Any suspicion of infection in or near the target: steroid suppresses the immune response and can make an infection worse.
• The Achilles tendon, as above.
• As a substitute for the actual plan. An injection that lets you skip the stretching, footwear, or offloading work usually buys a relapse. It buys time; the plan spends it.
• A red, hot, swollen joint that has not been diagnosed. That picture can be gout or infection, and the right first move is figuring out which, sometimes with a needle used for sampling rather than injecting.

The bottom line

A cortisone injection is a good tool with a specific job: calming an inflamed joint, nerve, or tissue enough to restore comfort and open a window for the real plan to work. Across the foot and ankle, from big toe and midfoot arthritis to the ankle joint, the sinus tarsi, a Morton's neuroma, and stubborn plantar fasciitis, it can be genuinely valuable, and for plantar fasciitis, used as a window for diligent stretching, I have seen it lead all the way to pain-free. What it is not is a shortcut around the stretching and mechanics that do the actual healing; it should never go into the Achilles; and a foot that keeps needing injections is telling you the plan needs to change. This page describes how these injections commonly look in my practice for education only; it is not a prescription or individualized medical advice, and your clinician's approach may reasonably differ.