Pudendal Nerve Entrapment

Pudendal neuralgia is a chronic pain condition caused by irritation or compression of the pudendal nerve, the primary nerve responsible for sensation in the perineum, genitals, and anorectal region. When this nerve becomes entrapped, it can cause severe, life-altering pain that is often misdiagnosed for years.

Understanding the Pudendal Nerve

The pudendal nerve originates from the sacral nerve roots (S2–S4) and travels through several anatomically narrow corridors in the pelvis. It passes between the sacrotuberous and sacrospinous ligaments, through Alcock's canal (the pudendal canal along the obturator internus muscle), and branches into the inferior rectal nerve, perineal nerve, and dorsal nerve of the penis or clitoris.

Because the pudendal nerve passes through these tight anatomical spaces, it is susceptible to compression at multiple points along its course. The most common sites of entrapment include:

• Between the sacrotuberous and sacrospinous ligaments — the most frequently identified compression point
• Alcock's canal — within the fascial tunnel along the obturator internus
• Below the piriformis muscle — at the nerve's exit from the pelvis

Symptoms

Pudendal neuralgia presents with a characteristic pattern of symptoms that can significantly impair quality of life. The hallmark features include:

• Perineal pain: Burning, shooting, or aching pain in the area between the sit bones — the perineum, vulva or scrotum, and perianal region
• Pain worsened by sitting: A defining feature — symptoms typically worsen when seated and improve when standing or lying down
• Unilateral predominance: Pain is usually (though not always) worse on one side
• Sexual dysfunction: Pain during or after sexual activity, genital numbness, or arousal pain
• Urinary symptoms: Urgency, frequency, or pain during urination
• Bowel symptoms: Pain with bowel movements, sensation of incomplete evacuation, or constipation
• No sensory loss on clinical exam: Unlike nerve transection injuries, entrapment often preserves gross sensation while producing pain

Diagnosis: The Nantes Criteria

The Nantes criteria are the internationally recognized diagnostic framework for pudendal nerve entrapment. To meet these criteria, all five inclusion criteria must be present:

1. Pain in the anatomical territory of the pudendal nerve
2. Pain predominantly experienced while sitting
3. The patient is not woken at night by the pain
4. No objective sensory loss on clinical examination
5. Positive response to a diagnostic pudendal nerve block

Additional diagnostic tools may include:

• MR neurography: Specialized MRI sequences that can visualize nerve inflammation, swelling, or surrounding structural abnormalities
• Electromyography (EMG): Pudendal nerve terminal motor latency testing, which can identify nerve conduction delays
• Diagnostic nerve blocks: CT-guided or ultrasound-guided blocks at specific points along the nerve to confirm the site of entrapment

Treatment Approach

Conservative Management

The first line of treatment is always conservative. Many patients improve with a multidisciplinary non-surgical approach:

• Pelvic floor physical therapy: Specialized PT to address muscular tension and dysfunction that can contribute to or exacerbate nerve compression
• Medications: Neuropathic pain agents (gabapentin, pregabalin, amitriptyline, duloxetine) can help manage symptoms
• Nerve blocks: CT-guided pudendal nerve blocks using corticosteroid and local anesthetic, which serve both a diagnostic and therapeutic role
• Lifestyle modifications: Avoiding prolonged sitting, using a cushion with a cutout, ergonomic adjustments
• Behavioral approaches: Mindfulness, cognitive behavioral therapy for chronic pain

Surgical Decompression

When conservative measures fail to provide adequate relief — typically after 6 to 12 months of multidisciplinary management — surgical decompression may be recommended. Dr. Lakhiani performs pudendal nerve decompression using a transgluteal approach that provides excellent visualization of the nerve along its entire pelvic course.

The surgery involves:

• Releasing the nerve from the sacrotuberous and sacrospinous ligament complex
• Decompressing Alcock's canal
• Releasing any adhesions or scar tissue surrounding the nerve
• Performing neurolysis (freeing the nerve from surrounding constricting tissue)

The procedure is performed under general anesthesia and typically requires an inpatient stay. Recovery involves a gradual return to activities, with most patients seeing progressive improvement over 6 to 18 months as the nerve heals.

Dr. Lakhiani's Approach

Dr. Lakhiani is fellowship-trained in microsurgery and peripheral nerve surgery, bringing a level of expertise that is essential for this delicate procedure. His approach emphasizes:

• Thorough preoperative evaluation with the Pelvic Pain Clinic team
• Careful patient selection — ensuring surgery is appropriate
• Microsurgical technique for nerve decompression with magnification
• Coordination with pelvic floor physical therapy before and after surgery
• Long-term follow-up to support each patient's recovery

Connection to the Pelvic Pain Clinic

Pudendal nerve entrapment is treated within Dr. Lakhiani's multidisciplinary Pelvic Pain Clinic. The team includes pelvic floor physical therapists, physiatrists (PM&R physicians), and urologists who work together to develop a comprehensive, individualized treatment plan.