Several types of injections are used to treat back pain, and the right one depends on where your pain originates. The most common are epidural steroid injections, facet joint injections, sacroiliac joint injections, and trigger point injections. Each targets a different structure in the spine or surrounding muscles, and some serve double duty as both diagnostic tools and treatments.
Epidural Steroid Injections
Epidural steroid injections (ESIs) are the most widely used spinal injection for back pain. They deliver a steroid (an anti-inflammatory medication) into the epidural space, the area surrounding the spinal cord and nerve roots. The goal is to reduce inflammation around compressed or irritated nerves, which is why they’re most commonly used for conditions like herniated discs, spinal stenosis, and sciatica.
There are three approaches, and the one your doctor chooses depends on where the problem is and how precise the delivery needs to be:
- Transforaminal: The usual first choice for lower back injections. The needle targets the exact spot where a compressed nerve root exits the spine, delivering medication right to the source of the problem.
- Interlaminar: Enters the epidural space from the back of the spine and can treat multiple levels or both sides at once, making it useful when pain is more widespread.
- Caudal: The simplest approach, entering through the tailbone. It’s less precise but works well when multiple areas of the spine are involved or when previous surgery makes other approaches difficult.
Pain relief from ESIs tends to be modest and temporary. In clinical trials, epidural steroids provided a small but measurable improvement in leg pain during the first three months compared to placebo, along with mild reductions in disability. At the intermediate mark (three to twelve months), the benefit for pain itself largely faded, though some disability improvement remained. Relief varies widely from person to person. Some patients get months of meaningful improvement, while others notice little difference.
Facet Joint Injections
Facet joints are small paired joints that run along the back of your spine, connecting one vertebra to the next. They allow your spine to bend and twist while keeping it stable. When these joints become inflamed from arthritis, injury, or general wear, they can produce a deep, aching pain that worsens when you lean backward or twist.
A facet joint injection places a small amount of local anesthetic and steroid directly into the affected joint. The anesthetic provides quick, short-lived numbness, and the steroid works over the following days to reduce inflammation for longer-lasting relief. These injections also serve a diagnostic purpose: if the anesthetic immediately eliminates your pain, it confirms the facet joint is the source, which helps guide further treatment decisions.
One of the practical benefits of facet joint injections is that they can reduce pain enough to let you participate in physical therapy or stretching programs that were previously too painful. The injection itself is not a long-term fix, but the window of relief it creates can make rehabilitative exercise possible.
Sacroiliac Joint Injections
The sacroiliac (SI) joints sit where your lower spine connects to your pelvis, one on each side. SI joint dysfunction is a common but often overlooked cause of lower back and buttock pain. It can mimic other conditions, which makes diagnosis tricky.
Like facet joint injections, SI joint injections use a combination of local anesthetic and steroid. If the anesthetic portion eliminates your pain, the SI joint is confirmed as the culprit. As many as two-thirds of patients experience significant improvement lasting roughly nine months after a steroid injection into the SI joint. In one clinical comparison, five out of six joints injected with steroid achieved greater than 70% pain relief at one month, compared to minimal improvement with placebo.
Some pain centers are also using platelet-rich plasma (PRP) injections for SI joint pain. PRP is made from your own blood, concentrated to contain a high dose of growth factors that promote healing and reduce inflammation. It’s a newer option with growing but still limited evidence compared to traditional steroid injections.
Trigger Point Injections
Not all back pain comes from the spine itself. Trigger points, commonly called muscle knots, are tight bands of muscle fiber that get stuck in a contracted state. They can develop after an acute injury or from repetitive strain and often cause persistent, localized pain in the upper or lower back.
A trigger point injection places medication directly into the knot. The injection typically contains a local anesthetic, sometimes combined with a steroid. In some cases, botulinum toxin is used instead. There’s also dry needling, which uses the same technique but without injecting any substance at all. The mechanical disruption of the needle itself can release the contracted muscle fibers. Like other injections, trigger point injections are often most valuable as a bridge: they reduce pain enough to allow stretching and physical therapy that addresses the underlying muscle problem.
How Imaging Guidance Improves Accuracy
Most spinal injections are performed under real-time imaging to ensure the needle reaches the right spot. The two main options are fluoroscopy (a type of live X-ray) and ultrasound.
Fluoroscopy is the traditional standard for spinal injections. It allows doctors to see bony landmarks clearly and confirm precise needle placement using contrast dye. Ultrasound has the advantage of showing soft tissues like nerves, blood vessels, and muscles in real time without radiation exposure. One study found that ultrasound-guided procedures were significantly faster (about four and a half minutes versus ten and a half minutes) with fewer needle passes and no instances of accidentally puncturing a blood vessel, compared to ten occurrences with fluoroscopy.
However, ultrasound has limitations. It struggles with deeper structures, especially in patients with a higher body mass index, and it can’t reliably detect when medication enters a blood vessel during certain types of injections. For deeper or more complex procedures, fluoroscopy remains the safer and more reliable choice.
How Often You Can Get Injections
Steroid injections aren’t meant to be repeated indefinitely. Federal guidelines from the Centers for Medicare and Medicaid Services limit epidural steroid injections to a maximum of four sessions per spinal region in a rolling twelve-month period. Treatment extending beyond twelve months is generally not considered necessary, and frequent continuation past that point may trigger a medical review.
These limits exist because repeated steroid exposure carries cumulative risks, including weakening of nearby bone and soft tissue. Your doctor will typically reassess your treatment plan if injections aren’t providing adequate or lasting relief after a few rounds.
What Recovery Looks Like
Recovery from most back pain injections is straightforward. You can typically return to your normal routine within a day or two, though some people prefer to take it easy for the rest of the injection day. After an epidural, the local anesthetic may leave your legs feeling heavy or numb for a short time. You’ll likely be able to walk, but you should be careful until full sensation returns.
Avoid baths for the first 24 hours to keep the injection site clean, though showers are generally fine. The steroid component takes a few days to reach full effect, so don’t judge the results based on how you feel immediately after the anesthetic wears off. Some people experience a temporary increase in pain at the injection site during this gap, which is normal and usually resolves within a day or two.
PRP and Regenerative Injections
Platelet-rich plasma therapy is gaining traction as an alternative or complement to steroid injections. PRP concentrates healing and anti-inflammatory factors from your own blood and delivers them to the painful area. It’s currently being used for SI joint pain and certain types of back pain at major medical centers, though it’s not yet as well-studied as traditional steroid injections.
If you’re considering PRP, you’ll need to stop blood-thinning medications, including aspirin, for a short period before and after treatment. People with active cancer, infections, or blood disorders are generally not candidates. Stem cell therapy for back pain, while heavily marketed, is not currently recommended due to insufficient evidence that it works.