Why are pain injections often done under imaging?

Image guidance with fluoroscopy or ultrasound helps place medication accurately at the intended target and reduces the chance of misplacement, improving the reliability and safety of many procedures.

Interventional Pain Procedures

Interventional pain procedures are minimally invasive, often image-guided techniques that deliver medication to, or modulate, specific anatomical targets to relieve pain. They range from joint and epidural injections to nerve blocks, radiofrequency procedures, and neuromodulation, and they are used selectively within a broader multimodal pain management plan.

Definition

Interventional pain procedures are targeted techniques, such as injections, nerve blocks, radiofrequency neurotomy, and neuromodulation, that aim to interrupt or modify pain signalling at a defined anatomical site, typically using imaging guidance to improve accuracy.

Scope

This topic surveys the categories of interventional pain procedures, the rationale for image guidance, and the structure of their evidence base, presented as reference knowledge. It does not provide procedural technique, dosing, or individualized treatment guidance.

Core questions

What categories of interventional pain procedures exist and what targets do they address?
Why is image guidance used, and how does it affect accuracy and safety?
How strong is the evidence for common procedures relative to conservative care?
How are interventional procedures positioned within a multimodal pain plan?

Key concepts

Image-guided injection (fluoroscopy, ultrasound)
Epidural corticosteroid injection
Diagnostic and therapeutic nerve blocks
Radiofrequency neurotomy
Neuromodulation (e.g. spinal cord stimulation)
Multimodal pain management
Procedure-specific evidence and indications

Mechanisms

Interventional procedures act by delivering drugs to, or modulating signalling at, a defined target. Injections place anti-inflammatory or anaesthetic agents near an inflamed or pain-generating structure; diagnostic blocks test whether a specific structure contributes to pain; radiofrequency techniques interrupt nociceptive transmission along targeted nerves; and neuromodulation alters signalling through electrical stimulation. Image guidance with fluoroscopy or ultrasound is used to improve placement accuracy and reduce the risk of misplacement. The selection of a procedure depends on a mechanism- and target-based rationale and on how a given pain fits the ICD-11 chronic pain framework (Treede et al., 2019).

Clinical relevance

Interventional procedures are one component of how persistent pain is addressed in rehabilitation and pain medicine, used selectively alongside education, rehabilitation, and pharmacological care. This entry describes the categories and evidence as reference material; it is not a guide to performing procedures or to individual treatment selection.

Epidemiology

Interventional procedures, particularly epidural and joint injections, are performed in large numbers for chronic spinal and joint pain, though utilization and indications vary widely between settings and over time, prompting ongoing efforts to align practice with evidence.

Evidence & guidelines

Evidence-based guidelines for interventional techniques in chronic spinal pain grade the strength of evidence by procedure and indication (Manchikanti et al., 2013). A systematic review and meta-analysis of epidural corticosteroid injections for sciatica found small, short-term benefits that were generally not sustained, illustrating how evidence varies by procedure (Pinto et al., 2012).

History

Interventional pain practice grew through the twentieth century from regional anaesthesia and nerve blocks toward a broad set of image-guided diagnostic and therapeutic techniques. As utilization expanded, systematic reviews and evidence-based guidelines were developed to clarify which procedures are supported and for which indications (Manchikanti et al., 2013; Pinto et al., 2012).

Debates

How effective are epidural corticosteroid injections for sciatica?: Meta-analytic evidence indicates small, short-term reductions in leg pain that are generally not maintained and that do not clearly reduce surgery, leaving the role of these injections debated relative to conservative care.

Key figures

Laxmaiah Manchikanti
Rafael Z. Pinto
Christopher G. Maher

Seminal works

manchikanti-2013
pinto-2012

Frequently asked questions

Why are pain injections often done under imaging?: Image guidance with fluoroscopy or ultrasound helps place medication accurately at the intended target and reduces the chance of misplacement, improving the reliability and safety of many procedures.
Do interventional procedures replace other pain treatments?: No. They are used selectively within a multimodal plan alongside education, rehabilitation, and pharmacological care, and their evidence and role vary by procedure and condition.