Facet-Mediated Pain &
SI Joint / Cluneal Nerve Pain

Facet-mediated pain refers to pain arising from the small joints at the back of the spine, known as facet joints. These joints help guide movement and provide stability to the spine.

Over time, these joints can undergo degenerative changes, including cartilage wear, inflammation, and enlargement. As they become irritated, they can generate localized pain, particularly in the lower back or neck. In addition, facet joint overgrowth or hypermobility can contribute to nerve irritation by narrowing surrounding spaces.

Similar to degenerative disc changes, radiological evidence of facet degeneration does not necessarily mean that the joints are the source of pain. In many cases, only one level is symptomatic, and identifying the correct pain generator is essential for effective treatment.

Common Symptoms of Facet-Mediated Pain

• Localized pain in the lower back or neck
• Pain worsened by standing or extension (leaning backward)
• Pain that improves with sitting or bending forward
• Stiffness, especially after periods of inactivity
• Pain that may radiate into the buttock or thigh, but typically not below the knee
• Intermittent muscle spasms or a sense of tightness in the surrounding muscles

Not all lower back or buttock pain originates from the spine. The sacroiliac (SI) joint and cluneal nerves are important and often overlooked sources of pain in this region. These two conditions are presented together because they are common causes of unilateral (one-sided) lower back pain, and because their investigation and treatment approaches are often similar.

The SI joint connects the base of the spine (sacrum) to the pelvis and plays a key role in transferring forces between the upper body and the legs. Dysfunction or inflammation of this joint can result from abnormal biomechanics, including prior spinal fusion, trauma, or physiological stressors such as childbirth.

The cluneal nerves are small sensory nerves that travel over the pelvis and supply the skin of the lower back and buttock. These nerves can become irritated or entrapped as they pass through tight anatomical spaces, often following trauma or muscle strain.

Common Symptoms — SI Joint Pain

• Pain localized to the lower back or buttock, usually on one side
• Pain worsened by standing, walking, or transitional movements (e.g., getting up from sitting)
• Pain with weight-bearing on one leg (e.g., climbing stairs, getting out of a car)
• Pain that may radiate into the groin, buttock, or upper thigh
• Pain often reproduced with specific physical examination maneuvers

Common Symptoms — Cluneal Nerve Pain

• Localized pain over the lower back or upper buttock
• Burning, sharp, or aching pain over a small, well-defined area
• Pain that can be reproduced with direct finger palpation over the affected region
• Pain worsened by pressure or certain movements
• In some cases, a small patch of numbness over the gluteal region

Facet-Mediated Pain

• MRI or CT scan: may show facet joint degeneration, enlargement, or inflammation
• X-rays: can demonstrate joint changes or associated instability
• Diagnostic facet injections or medial branch blocks: may be used to confirm whether a specific facet joint is the primary pain generator

SI Joint and Cluneal Nerve Pain

Diagnosis of SI joint and cluneal nerve pain is primarily clinical. Unlike many spinal conditions, imaging is often not helpful in identifying the true source of pain. For this reason, diagnosis is based on:

• A detailed clinical history
• Focused physical examination
• Reproduction of symptoms with specific maneuvers or palpation

Facet-Mediated Pain

Conservative (non-surgical) treatment

• Activity modification and education
• Physiotherapy focused on movement patterns, posture, and core stability
• Medications for pain and inflammation

Interventional treatments

• Facet joint injections
• Medial branch blocks
• Radiofrequency ablation (RFA) in selected cases

Surgical treatment

Surgery is rarely required for isolated facet-mediated pain. When facet degeneration is part of a broader condition — such as spinal instability, radiculopathy, or stenosis — treatment is directed at the underlying cause. In selected patients, it may be possible to address neurological symptoms with decompression while also treating facet-related pain through endoscopic medial branch neurolysis.

SI Joint and Cluneal Nerve Pain

Conservative (non-surgical) treatment

• Activity modification and education
• Physical therapy focused on pelvic stability and movement patterns
• Medications for symptom control

Interventional treatments — SI Joint

• Intra-articular SI joint diagnostic injections (local anesthetic only) to confirm the source of pain
• Corticosteroid or PRP injections may be used selectively for longer-term symptom relief
• SI joint dorsal branch ablation (RFA) in selected patients

Interventional treatments — Cluneal Nerve

• Cluneal nerve blocks using local anesthetic for diagnostic confirmation
• Radiofrequency ablation (RFA) or cryotherapy for longer-lasting relief

Surgical treatment

Surgery is rarely required. In selected cases, cluneal nerve neurolysis may be considered when symptoms are persistent and clearly localized, and minimally invasive SI joint fusion may be an option in carefully selected patients with confirmed SI joint dysfunction that has not responded to other treatments.