Steroids are injected into joints, muscles, or the fat layer just beneath the skin, depending on the type of steroid and what it’s treating. Joint injections target a specific problem area like a knee or shoulder. Intramuscular injections deliver the steroid into large muscle groups for systemic absorption. Subcutaneous injections go into fatty tissue, typically around the abdomen or thighs.
Joint Injections
Corticosteroid shots for pain and inflammation go directly into the affected joint. The most common sites are the knee, shoulder, hip, spine, elbow, ankle, and wrist. Smaller joints in the hands and feet can also receive injections. These are almost always performed by a doctor or specialist who uses anatomical landmarks (and sometimes ultrasound guidance) to place the needle precisely into the joint space. The goal is to deliver a concentrated dose of anti-inflammatory medication right where it’s needed, rather than flooding the whole body.
Epidural steroid injections in the spine follow the same principle. A physician places the needle near the inflamed nerve root in the spinal canal to relieve pain from conditions like herniated discs or spinal stenosis.
Intramuscular Injection Sites
When steroids need to be absorbed into the bloodstream through muscle tissue, there are a few preferred sites. Each one is chosen because the muscle is thick enough to hold the medication and far enough from major nerves and blood vessels to minimize risk.
Deltoid (upper arm): The injection goes into the middle, thickest part of the shoulder muscle. To find the right spot, locate the bony point at the top of your shoulder (the acromion process), then measure about two to three finger widths below it. The injection site sits in the area between that point and the armpit fold. This is one of the most accessible sites but holds a smaller volume of fluid than the gluteal muscles.
Ventrogluteal (hip): This is widely considered the safest site for intramuscular injections because it has a thick layer of muscle and sits away from the sciatic nerve and major blood vessels. To locate it, place the heel of your hand on the bony prominence at the top of the outer thigh (the greater trochanter), point your index finger toward the front of the hip bone, and spread your middle finger toward the top of the hip crest. The injection goes into the center of the triangle formed by those two fingers.
Vastus lateralis (outer thigh): This muscle runs along the outer middle third of the thigh, between the knee and the hip. It’s a common choice for self-injection because it’s easy to see and reach. The injection goes into the outer sweep of the thigh, roughly a hand’s width above the knee and a hand’s width below the hip.
Dorsogluteal (upper outer buttock): This was traditionally the default site, but it carries a higher risk of hitting the sciatic nerve. Most clinical guidelines now recommend the ventrogluteal site instead. If the dorsogluteal is used, the injection must stay in the upper outer quadrant of the buttock.
Subcutaneous Injection Sites
Some steroid formulations are designed to be injected into the layer of fat between the skin and muscle. The technique is simpler than intramuscular injection: you pinch a two-inch fold of skin and insert a shorter needle at a 45 to 90 degree angle.
The most common subcutaneous sites are the abdomen (avoiding the navel and waistline), the outer surface of the upper arm, the front of the thighs, and the buttocks. If you’re very lean, the abdomen may not have enough fat to use safely. All of these areas have a reliable subcutaneous layer in most people.
Needle Size Matters
The needle you use depends on the injection type and your body size. Subcutaneous injections typically use a short, thin needle, around 5/8 inch long. Intramuscular injections need a longer needle to reach past the fat and into the muscle. For most adults injecting into the deltoid or thigh, a 1-inch needle works for those weighing around 130 pounds or less. At higher body weights, a 1 to 1.5 inch needle is standard, and people over roughly 200 pounds (for women) or 260 pounds (for men) generally need a full 1.5-inch needle to ensure the medication actually reaches the muscle.
Why Site Rotation Matters
If you’re injecting regularly, using the same spot every time can cause problems. Repeated injections in one area can lead to skin changes, tissue thinning, or hard lumps under the skin. Rotating between different sites, and tracking where you last injected, helps prevent these complications. For joint injections, doctors typically limit how often they inject the same joint because repeated corticosteroid exposure can weaken cartilage and surrounding tissue over time.
The Z-Track Technique
For intramuscular steroid injections, many clinicians use a method called the Z-track technique to prevent medication from leaking back out through the needle path. Before inserting the needle, you pull the skin and tissue about one to one and a half inches to the side with your free hand. Then you insert the needle straight in at a 90-degree angle, inject slowly, withdraw the needle, and release the skin. When the skin slides back into its natural position, the entry path through the tissue becomes a zigzag rather than a straight line, sealing the medication inside the muscle.
Signs of a Problem After Injection
Some soreness, mild swelling, or a small bruise at the injection site is normal and usually resolves within a day or two. What’s not normal is increasing redness, warmth, or swelling that gets worse instead of better over the following days. Fever, drainage from the injection site, or a rapidly expanding area of skin discoloration can indicate infection, which, while rare, requires prompt medical attention.
If you feel a sharp, electric, shooting pain during the injection, especially down a limb, the needle may have contacted a nerve. This is most commonly a concern with carpal tunnel injections (near the median nerve), knee injections (near the saphenous nerve), and dorsogluteal injections (near the sciatic nerve). The ventrogluteal and deltoid sites were specifically adopted because they minimize this risk. Numbness or tingling that persists more than 48 hours after an injection warrants follow-up.
Localized skin thinning or a visible dip in the tissue at the injection site can occur with repeated corticosteroid injections. This is more common with superficial joint and tendon injections than with deep intramuscular ones, and it’s one reason doctors space out cortisone shots to the same area.