Low back & buttock pain
Pain is often felt below the beltline and may be more prominent on one side, although symptom patterns vary.
SACROILIAC JOINT PAIN
When the connection between the spine and pelvis becomes a source of pain.
The sacroiliac (SI) joints connect the sacrum at the base of the spine to the pelvis. In selected patients, an SI joint can become a meaningful pain generator and contribute to persistent low back, buttock, or nearby referred pain.
UNDERSTANDING SI JOINT PAIN
Pain near the SI joint does not necessarily come from the SI joint.
SI joint pain can overlap with symptoms from the lumbar spine, hip, muscles, and other structures around the pelvis.
That overlap makes a focused evaluation important. The diagnosis is built from the history, pain pattern, physical examination, and a combination of provocative maneuvers. When clinically appropriate, an image-guided diagnostic injection can provide additional information about whether the SI joint is contributing meaningfully to the patient’s symptoms.
COMMON FEATURES
How SI joint pain may present.
No single symptom or examination finding proves that the SI joint is the source of pain. Certain patterns can raise suspicion and guide a more focused diagnostic evaluation.
Referred pain
Symptoms may extend into the buttock, groin, or thigh and can overlap with lumbar spine and hip conditions.
Activity-related pain
Transitions, prolonged standing, walking, stairs, or loading one side of the pelvis may aggravate symptoms in some patients.
Localized tenderness
Tenderness near the SI region can support the clinical picture, but it is not sufficient to establish the diagnosis by itself.
DIAGNOSTIC EVALUATION
Build the diagnosis from more than one finding.
A focused examination commonly includes several provocative maneuvers intended to stress the SI joint and reproduce the patient’s familiar pain. A cluster of concordant findings is generally more informative than any single test.
Imaging can help evaluate anatomy and identify competing conditions, but routine degenerative findings do not prove that an SI joint is painful. In selected patients, an image-guided intra-articular diagnostic injection can help clarify whether the joint is a meaningful pain generator.
DIAGNOSIS
Confirm the pain generator before choosing the treatment.
SI joint pain is a clinical diagnosis supported by the overall pattern of symptoms and examination findings. Because nearby lumbar, hip, and musculoskeletal conditions can look similar, the evaluation should consider competing pain generators rather than assuming that pain over the SI region identifies the source.
Pattern mattersPain location and activity-related symptoms help establish whether the SI joint should be investigated further.
Exam mattersA combination of provocative maneuvers is more useful than relying on a single physical examination test.
Confirmation mattersWhen appropriate, image-guided diagnostic injection can provide additional evidence that the SI joint is contributing to symptoms.
TREATMENT
Treatment depends on the diagnosis and degree of functional limitation.
Conservative care
Treatment may begin with activity modification, therapeutic exercise or physical therapy, and appropriate medication strategies based on the individual clinical situation.
Image-guided injection
For selected patients, an image-guided SI joint injection may be used diagnostically and, in some clinical situations, therapeutically as part of the treatment plan.
Advanced treatment
When SI joint pain remains significantly limiting despite appropriate non-surgical care and the diagnosis is well supported, additional treatment options—including minimally invasive SI joint fusion in carefully selected patients—may be considered.
FREQUENTLY ASKED QUESTIONS
Common questions about SI joint pain.
How can you tell SI joint pain from low back pain?
The symptoms can overlap substantially. The pain pattern, physical examination, provocative maneuvers, and evaluation for competing lumbar spine or hip conditions all help determine whether the SI joint is a likely pain generator.
Can an MRI diagnose SI joint pain?
Not by itself. Imaging can identify structural abnormalities and help evaluate other potential causes of symptoms, but an imaging finding alone does not establish that the SI joint is the source of pain.
What is a diagnostic SI joint injection?
An image-guided diagnostic injection places local anesthetic into the SI joint. The response during activities that typically provoke symptoms can provide additional information about whether the joint is contributing meaningfully to the patient’s usual pain.
Does SI joint pain mean I need fusion?
No. SI joint fusion is not the starting point for most patients. It may be considered for carefully selected patients with persistent, functionally limiting symptoms and a well-supported SI joint diagnosis despite appropriate non-surgical treatment.
Can SI joint pain cause symptoms in the leg?
Yes. SI joint pain can refer into the buttock, groin, or thigh. Symptoms extending farther down the leg—particularly when accompanied by numbness, tingling, or weakness—may warrant evaluation for lumbar nerve-root involvement or another cause.
NEXT STEP
Could the SI joint be contributing to your pain?
A focused evaluation can help determine whether the SI joint is contributing meaningfully to your symptoms, whether another structure may be responsible, and which treatment options may be appropriate for your clinical picture and goals.
Request an AppointmentThis page provides general educational information and does not replace an individualized medical evaluation. Symptoms, diagnostic findings, treatment options, risks, and expected outcomes vary by patient. Treatment recommendations should be based on the complete clinical picture.