Sacroiliac joint injections and radiofrequency ablation for pain management: A clinical review

Table 1 A comparison of various radiofrequency ablation techniques

Technique	Target/approach	Lesion size and coverage	Procedure complexity	Typical duration of effect	Ref.
Conventional RFA	Lateral branches of sacral dorsal rami ± L5 dorsal ramus	Small focal lesions. Requires multiple needle placements	Moderate. Precise needle placement. Fluoroscopy	3-6 months. 50%-70% achieve. ≥ 50% pain relief	[61]
Cooled RFA	Similar targets. Uses an internally cooled electrode	Larger spherical lesions. Better covers anatomical variability	Higher. Specialized equipment. Longer lesion cycle	6-12 months. Better sustained benefit	[65]
PRF	Modulates nerve without thermal lesion	Very small/non-destructive lesions	Low-moderate. Shorter procedure. Lower risk	3-6 months. Repeatable. Useful for fragile nerves	[65,75]
Bipolar ‘Palisade’ RFA	Two parallel electrodes create linear lesions. Targets multiple nerves	Larger continuous strip lesions. Broader nerve coverage	Higher. Requires dual electrode placement. Faster	About 12 months. Reported higher rates of pain relief	[65,87]
Endoscopic-guided RFA	Direct visualization of target nerves with an endoscope	Precise lesioning under visual control	High. Specialized training and equipment are required	About 6-12 months. > 80% patient satisfaction	[66,84]

RFA: Radiofrequency ablation; PRF: Pulsed radiofrequency.

Table 2 A comparison of sacroiliac joint injections and radiofrequency ablation

Aspect	Sacroiliac joint injections	Radiofrequency ablation
Primary purpose	Diagnostic and short-term therapeutic relief	Longer-term therapeutic relief
Mechanism	Anti-inflammatory effect from corticosteroids; immediate block from local anesthetic	Thermal lesioning interrupts nociceptive nerve signaling
Typical duration of benefit	Weeks to a few months (often less than 3-6 months)	Several months, median often 6-12 months; repeatable
Functional improvement	Moderate, short-term; ODI scores improve but often plateau by six months	Greater and longer-lasting ODI improvement; higher global perceived effect
Evidence strength	Fair (level III); effective especially for acute flares or inflammatory causes	Moderate (RCTs and meta-analyses); superior to injections for chronic mechanical pain
Ideal patient profile	Acute inflammation, diagnostic uncertainty, or limited comorbidities	Chronic mechanical sacroiliac joint pain with proven response to diagnostic blocks
Repeatability	Readily repeatable; risk accumulates with steroids (e.g., tissue atrophy)	Repeatable, sustained benefit is possible; nerve regeneration may limit duration
Cost-effectiveness	Lower upfront cost; less equipment, higher long-term cost due to repeat procedures	Higher upfront cost, but lower cost per month of pain relief and reduced downstream care utilization
Technical demands	Requires image guidance, but technically straightforward	More complex: Multiple lesion targets, requires skill, and specialized equipment
Risk profile	Low; transient pain flare, bleeding, infection, steroid-related effects	Low; rare neuritis, numbness; similar infection risk when performed properly

RCT: Randomized controlled trial; ODI: Oswestry Disability Index.

Table 3 A summary of emerging and adjunct therapies for sacroiliac joint pain

Aspect	Sacroiliac joint injections	Radiofrequency ablation
Primary purpose	Diagnostic and short-term therapeutic relief	Longer-term therapeutic relief
Mechanism	Anti-inflammatory effect from corticosteroids; immediate block from local anesthetic	Thermal lesioning interrupts nociceptive nerve signaling
Typical duration of benefit	Weeks to a few months (often less than 3-6 months)	Several months, median often 6-12 months; repeatable
Functional improvement	Moderate, short-term; ODI scores improve but often plateau by six months	Greater and longer-lasting ODI improvement; higher global perceived effect
Evidence strength	Fair (level III); effective especially for acute flares or inflammatory causes	Moderate (RCTs and meta-analyses); superior to injections for chronic mechanical pain
Ideal patient profile	Acute inflammation, diagnostic uncertainty, or limited comorbidities	Chronic mechanical sacroiliac joint pain with proven response to diagnostic blocks
Repeatability	Readily repeatable; risk accumulates with steroids (e.g., tissue atrophy)	Repeatable, sustained benefit is possible; nerve regeneration may limit duration
Cost-effectiveness	Lower upfront cost; less equipment, higher long-term cost due to repeat procedures	Higher upfront cost, but lower cost per month of pain relief and reduced downstream care utilization
Technical demands	Requires image guidance, but technically straightforward	More complex: Multiple lesion targets, requires skill, and specialized equipment
Risk profile	Low; transient pain flare, bleeding, infection, steroid-related effects	Low; rare neuritis, numbness; similar infection risk when performed properly

ODI: Oswestry Disability Index; RFA: Radiofrequency ablation; RCT: Randomized controlled trials.