Diagnostic purpose
Local anaesthetic can provide short-term information about how much of the usual pain may arise from the targeted joint. Pain and function should be assessed during the expected test period.
Consultant-led private assessment
Sacroiliac Joint Pain, Injections and Radiofrequency
Careful assessment of pain around the buttock and posterior pelvis, with an image-guided sacroiliac-joint injection or selected radiofrequency treatment considered only when the clinical purpose is clear.
Hip, spine and nerve-root causes considered
Diagnostic and therapeutic purposes distinguished
Radiofrequency discussed with evidence uncertainty
Private practice in Colchester and Ipswich
Dr Shamim Haider
Consultant in Pain Medicine and Anaesthesia. Assessment-led care with image guidance and realistic discussion of uncertainty.
About Dr HaiderUrgent symptoms need a different route
New bladder or bowel disturbance, numbness around the genitals or bottom, rapidly worsening leg weakness, fever with severe back pain, inability to bear weight after injury, or feeling acutely unwell require an appropriate urgent NHS or emergency assessment rather than a planned sacroiliac procedure appointment.
Understanding the joint
What is the sacroiliac joint?
The two sacroiliac joints connect the sacrum at the bottom of the spine to the pelvis. They transfer load between the upper body and legs and normally allow only a small amount of movement.
In some people, injury, inflammation, altered loading or degenerative change may contribute to pain around one buttock or the back of the pelvis. Pain may spread to the lower back, groin or upper thigh.
These symptoms overlap with lumbar facet pain, hip problems, muscular pain and nerve-root pain. The location alone therefore does not establish the diagnosis.
No single scan or examination test proves the pain source
Assessment combines the pain history, function, examination, relevant imaging and competing explanations. A targeted injection may sometimes add useful diagnostic information.
Assessment before procedure
Why careful selection matters
The consultation considers the precise pain area, aggravating activities, walking and sitting tolerance, hip and neurological symptoms, examination findings, previous treatment and relevant imaging.
Assessment also asks whether an injection would change the diagnosis or treatment plan. The aim is not to offer a procedure simply because the pain is close to the sacroiliac joint.
- Pain is mainly felt around one or both buttocks or the back of the pelvis
- Symptoms remain limiting despite appropriate simpler treatment
- Hip, lumbar-spine and nerve-root causes need to be considered
- Examination suggests the sacroiliac joint may be one contributor
- A diagnostic injection has been suggested to clarify the pain source
- A previous injection response needs review before considering radiofrequency
Simpler care usually comes first
Depending on the diagnosis, this may include activity modification, physiotherapy or rehabilitation, medicine review and management of contributing hip, spinal or inflammatory conditions.
Inflammatory sacroiliitis is a different clinical question
Features suggesting inflammatory disease, infection, fracture or another systemic cause require appropriate investigation and may need rheumatology, spinal, orthopaedic or other specialist care rather than a routine mechanical-pain procedure pathway.
Image-guided procedure
Sacroiliac-joint injection: diagnostic, therapeutic or both?
Therapeutic purpose
The injection may include a small amount of corticosteroid where appropriate. It may reduce pain temporarily, but it is not a cure and benefit is variable.
Image guidance
X-ray, ultrasound or another suitable form of image guidance is used to position the needle accurately. The exact technique depends on the purpose and anatomy.
The purpose must be agreed before treatment. A diagnostic injection should have a plan for recording the immediate response; a therapeutic injection should have realistic goals for pain, activity and rehabilitation.
After the injection
Interpreting the response
Little or no meaningful change
The targeted joint may be less likely to explain an important part of the pain. The diagnosis and next step should be reconsidered rather than automatically repeating the procedure.
Partial or unclear response
The joint may be one of several contributors, or the test may be difficult to interpret. Function, timing and competing pain sources need review.
Clear temporary response
A meaningful, time-linked improvement can support the diagnosis and may inform further rehabilitation, follow-up or discussion of selected radiofrequency treatment.
Selected longer-acting treatment
Sacroiliac-joint radiofrequency denervation
Sacroiliac radiofrequency uses controlled heat at selected nerve targets around the posterior sacroiliac joint to reduce transmission of pain signals. It does not fuse, repair or remove the joint.
The anatomy and technique differ from facet medial-branch denervation. Target selection, diagnostic testing, equipment and lesion pattern may vary between clinical pathways.
It may be considered only after the overall assessment and previous diagnostic response support the rationale. A good injection or block response does not guarantee radiofrequency benefit.
Important evidence limitation
Evidence for sacroiliac radiofrequency is less settled than the NICE-defined lumbar facet pathway. Studies use different selection criteria and techniques, and benefit is not assured. The possible advantage, uncertainty, alternatives and material risks should be discussed individually.
Read the general radiofrequency guideConnected pain pathways
How this differs from facet pain and sciatica
Facet-joint pathway
Facet procedures target spinal facet joints or their medial branch nerve supply. The diagnostic block and radiofrequency targets are different from those used around the sacroiliac joint.
Facet pain and medial branch blocksSciatica pathway
Leg-dominant pain with tingling, numbness or weakness may suggest nerve-root involvement. Sacroiliac treatment does not decompress a nerve or repair a disc.
Sciatica and nerve-root injectionsBalanced consent
Potential risks and limitations
Individual consent depends on the precise procedure, technique, medical history and medicines. Relevant considerations may include:
Temporary soreness, bruising or a flare of pain
Bleeding or haematoma
Infection
Temporary numbness, weakness or unsteadiness
Steroid-related effects when steroid is used
Failure to obtain worthwhile benefit
Radiofrequency neuritis or altered sensation
Rare nerve injury or other serious complication
Tell the clinical team about anticoagulant or antiplatelet medicine, diabetes, infection, allergies, pregnancy possibility and important health changes. Do not alter prescribed medication without individual advice.
Private appointments
Consultant-led care in Colchester and Ipswich
Oaks Hospital, Colchester
120 Mile End Road, Colchester CO4 5XR
Nuffield Health Ipswich Hospital
Foxhall Road, Ipswich, Suffolk IP4 5SW
Read about private pain care in IpswichFrequently asked questions
Questions about sacroiliac pain, injections and radiofrequency
There is no single symptom, examination manoeuvre or scan that proves the sacroiliac joint is the pain source. Diagnosis is based on the overall history and examination, consideration of competing causes and, in selected cases, the response to a carefully targeted diagnostic injection.
Imaging can identify inflammation, injury or other pathology and may help exclude alternative causes, but common mechanical sacroiliac pain is not diagnosed from a scan alone. Scan findings must be interpreted in clinical context.
No. Sacroiliac pain is commonly localised around the buttock and posterior pelvis and may refer to nearby areas. Sciatica is nerve-root pain, typically with leg-dominant symptoms and sometimes tingling, numbness or weakness. The two pathways require different assessment.
It may have a diagnostic purpose, a therapeutic purpose or both. Local anaesthetic can provide short-term information about whether the targeted joint contributes to the usual pain. Steroid may be included where clinically appropriate, but benefit is variable and the injection is not a cure.
No. A meaningful temporary response can support the treatment rationale, but it does not guarantee that sacroiliac radiofrequency will help or how long any benefit may last. Selection methods and radiofrequency techniques vary.
No. Both use radiofrequency energy, but the anatomy and nerve targets are different. Facet denervation targets medial branch nerves. Sacroiliac radiofrequency targets selected nerve supply around the posterior sacroiliac joint, using a technique chosen for that anatomy.
Responses vary considerably. Benefit may be worthwhile, brief or absent, and no fixed duration can be promised. The purpose of treatment and how success will be measured should be agreed beforehand.
Do not assume that you can drive. The Faculty of Pain Medicine advises arranging collection after a sacroiliac injection, and hospital instructions may impose further restrictions after radiofrequency or sedation. Follow the individual instructions you are given.
Do not stop anticoagulant or antiplatelet medication without individual instructions from the clinical team responsible for the procedure. The plan depends on the medicine, why you take it and the procedural bleeding risk.
Further information
Reliable UK patient information
Procedure-specific patient information
These UK patient resources explain sacroiliac-joint injection and sacroiliac radiofrequency treatment. Local hospital arrangements may differ.
NHS: Sacroiliac-joint injections
Patient information about the purpose, limitations and practical pathway for a sacroiliac-joint injection.
Visit sourceNICE: Chronic SI-joint pain context
Technology guidance describing chronic sacroiliac-joint pain and the wider non-surgical treatment context.
Visit sourceNHS: Back pain
General information about back pain, self-care and warning symptoms requiring urgent assessment.
Visit sourceClinical information on this page is presented by Dr Shamim Haider, Consultant in Pain Medicine and Anaesthesia. It is general information, not a diagnosis or personalised treatment recommendation.
Book a private assessment
The first step is a consultation to decide whether the sacroiliac joint is a plausible pain source, whether an injection would provide useful information, and whether another diagnosis or treatment should take priority.
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