Why Imaging Guidance Matters for Spine and Joint Injections

Original Publication Date: February 2017

Updated October 2026

Even after resting, stretching, and physical therapy, you might find that the ache in your back, neck, or knee may keep coming back, hindering your day-to-day life. 

Injections are one way our team may help calm that pain. Still, many patients arrive for their first procedure wondering how the provider will know exactly where the medicine should go. The short answer is imaging guidance, which uses live pictures from inside the body to direct the needle toward its target.

Knowing how imaging guidance works can help you feel more prepared before your procedure. Read on to learn what it is, the two main types, and how our team at Rocky Mountain Spine & Sport uses it.

What Is Imaging Guidance?

Many injections target structures that are small and sit deep beneath the skin. A facet joint in the spine, the epidural space around the spinal nerves, and the inside of a knee joint are a few examples. None of these can be seen from the outside, and the nerves, blood vessels, and tendons around them are packed closely together.

With imaging guidance, the provider watches a screen throughout the procedure. The images show the needle as it moves, which helps place it in the right spot before any medication is released. Because of this, the injection is more likely to reach the tissue that is actually causing your pain.

Types of Imaging Used for Injections

Two kinds of imaging are commonly used to guide injections. Each has its own strengths, and the choice often depends on the area being treated.

Fluoroscopy (Real-Time X-Ray)

Fluoroscopy is a form of X-ray that creates a moving, real-time picture on a video monitor. Bone shows up clearly, which makes it useful when the target sits among the bones of the spine.

In some procedures, a small amount of contrast dye is used to outline the area so the provider can see it more clearly. Fluoroscopy involves a small dose of radiation, and providers aim to keep that dose as low as possible.

Ultrasound

Ultrasound uses sound waves to create live images. It gives a clear view of soft tissues such as tendons, muscles, and the space inside many joints, and it does not use radiation.

Ultrasound guidance can also help the provider avoid nearby nerves and blood vessels. However, sound waves cannot pass through bone, so ultrasound suits some areas of the body better than others.

Why Accuracy Matters

An injection can only help if the medication reaches the right place. Imaging guidance supports that goal in several ways.

Benefits of a guided injection include:

  • Better information: Some injections, such as facet injections, also work as a diagnostic test. If your pain eases after medication reaches a specific joint, that helps confirm where the problem is coming from and shapes your next steps.
  • Fewer missed targets: Seeing the needle in real time lets the provider adjust its position before injecting, rather than relying only on how the anatomy feels from the outside.
  • Making the most of each treatment: Some injectates, such as platelet-rich plasma (PRP), are prepared from your own blood. Placing them accurately helps the treatment go where it is meant to go.
  • Protection of nearby structures: Any needle procedure carries some risk, including infection or injury to a nerve or blood vessel. Watching the needle's path helps the provider steer clear of these structures.

Injections We Guide With Imaging

At Rocky Mountain Spine & Sport, nearly all of our injections are performed with imaging guidance, using ultrasound, fluoroscopy, or a combination of the two. In fact, the main exceptions are some very shallow nerve or trigger point injections that sit just under the skin.

Guided procedures at our clinic include:

  • Epidural steroid injections: An epidural steroid injection delivers medication into the epidural space, a cushioning layer around the spinal cord, to calm inflamed spinal nerves. It is often used for low back pain that travels into the leg or neck pain that travels into the arm.
  • Facet injections: The facet joints are small joints that allow the vertebrae to move against one another. Facet injections place a mix of numbing medicine and a steroid into these joints to ease inflammation from arthritis or other chronic back and neck pain.
  • Joint injections: For joints outside the spine, such as the knee, our peripheral joint injections may use steroids, hyaluronic acid, PRP, platelet lysate, or bone marrow concentrate. The right option depends on your specific condition, and our post on platelet-rich plasma covers the basics of that option.

What to Expect Before and After a Guided Injection

Your provider will explain how to prepare for your specific procedure. Before your appointment, let our team know if you:

  • Are pregnant or could be: This matters most for fluoroscopy, since it uses X-rays.
  • Have allergies: Mention any allergies you have, especially to contrast dye or iodine.
  • Have had a fever in the past two weeks: Your care team will want to know about it before moving forward.
  • Take blood thinners: Some blood thinners and supplements may need to be paused for a few days, but only as your care team directs.

Afterward, some soreness or a temporary increase in pain for a few days is normal. Your provider will give you aftercare instructions, which may include protecting the area briefly and using ice. Call us if you notice pain, swelling, or skin changes that keep getting worse or last more than 48 hours, since these can be signs of infection.

An injection is often one piece of a larger plan. Many patients follow up with physical therapy and a home exercise program. Similarly, if facet injections confirm where the pain is coming from, radiofrequency ablation may be the next step.

Local Injection Care in Idaho Falls and Rexburg

Living with ongoing pain is exhausting, and deciding on a procedure can bring its own share of nerves. Our team of physiatrists believes in the body's potential for true healing, and we want every treatment to give you the best chance at relief.

Thankfully, you do not have to sort through your options alone. We will take time to find the cause of your pain, explain what a guided injection involves, and help you decide whether it fits your goals. Connect with us to schedule a visit at our Idaho Falls or Rexburg location.