```html

Grisel’s Syndrome – A Complete Patient‑Friendly Guide

Overview

Grisel’s syndrome is a rare, non‑traumatic atlanto‑axial subluxation (misalignment of the first two cervical vertebrae, C1 & C2) that typically occurs after an infection or inflammatory process in the head and neck region. The condition was first described by French physician Pierre Grisel in 1930.

• Who it affects: Most commonly children and adolescents (average age 5‑12 years), but cases have been reported in adults.
• Gender: Slight male predominance (≈55 % male).
• Prevalence: Exact incidence is unknown because it is under‑diagnosed; estimates range from 1 per 100 000 to 1 per 1 000 000 children per year.<sup>[1] CDC, 2023</sup>

The syndrome is usually triggered by inflammation of the soft tissues surrounding the cervical spine (e.g., after tonsillitis, otitis media, or cervical lymphadenitis). The inflammatory process leads to ligamentous laxity, allowing the atlas (C1) to rotate abnormally on the axis (C2).

Symptoms

Symptoms develop gradually over days to weeks after the inciting infection. The classic triad includes neck pain, torticollis (head tilt), and fever, but many patients present with only a subset of these signs.

Common clinical features

• Neck pain or stiffness – often unilateral and worsens with movement.
• Torticollis – head tilt to one side with the chin rotated to the opposite side (cock‑roach position).
• Limited range of motion – especially rotation and lateral bending.
• Fever – low‑grade, reflecting the underlying infection.
• Neurological signs (less common) – tingling, weakness, or gait instability if the spinal cord is compressed.
• Headache – may be localized to the occipital region.
• Ear or throat pain – residual symptoms from the original infection.

Red‑flag symptoms that suggest spinal cord involvement

• Sudden loss of strength or sensation in the arms or legs.
• Difficulty walking or maintaining balance.
• Urinary retention or incontinence.
• Severe, worsening neck pain unrelieved by rest or analgesics.

Causes and Risk Factors

Grisel’s syndrome is not caused by direct trauma; instead, it arises from inflammatory or infectious processes that affect the cervical ligamentous structures.

Primary causes

• Upper‑respiratory infections: tonsillitis, adenoiditis, peritonsillar abscess.
• Ear infections: otitis media, mastoiditis.
• Neck infections: cervical lymphadenitis, retropharyngeal abscess.
• Post‑surgical inflammation: after adenotonsillectomy, cervical spine surgery, or ear‑nose‑throat (ENT) procedures.

Risk factors

• Age: Children have more elastic ligaments, predisposing them to subluxation.
• Congenital ligamentous laxity: e.g., Down syndrome, Ehlers‑Danlos syndrome.
• Rapid head‑turning or forced neck positioning during examinations or surgeries.
• Delayed treatment of the primary infection – allowing inflammation to spread.

Diagnosis

Early recognition is critical to prevent neurological injury. Diagnosis combines a thorough history, physical exam, and targeted imaging.

Clinical evaluation

• Assessment of neck range of motion and identification of the characteristic “cock‑roach” posture.
• Neurological exam to evaluate motor strength, sensation, reflexes, and gait.
• Review of recent infections or ENT procedures.

Imaging studies

• Plain cervical radiographs (AP, lateral, open‑mouth odontoid view): may show atlanto‑axial offset (>3 mm in children) or asymmetry of the lateral masses.
• Computed tomography (CT) scan – gold standard for bony alignment; provides detailed measurement of the atlantodental interval (ADI) and rotation angle.
• Magnetic resonance imaging (MRI) – essential for evaluating soft‑tissue inflammation, ligamentous injury, and spinal cord compression.
• Dynamic (flexion‑extension) imaging – performed cautiously to assess stability after the acute phase.

Classification

Grisel’s syndrome is often graded using the Fielding and Hawkins system (Type I‑IV) based on the degree of rotation and anterior displacement. The type guides treatment intensity.

Treatment Options

Management aims to reduce inflammation, stabilize the cervical spine, and restore normal alignment while preventing neurologic damage.

Acute phase (first 1‑2 weeks)

• Immobilization – rigid cervical collar or Halo vest (for severe instability). Immobilization is typically maintained for 4‑6 weeks.
• Anti‑inflammatory medication – NSAIDs (ibuprofen 10 mg/kg q6‑8h) or short courses of oral corticosteroids (prednisone 1 mg/kg daily for 5‑7 days) to reduce ligamentous edema.
• Antibiotic therapy – targeted to the underlying infection (e.g., amoxicillin‑clavulanate for streptococcal tonsillitis). Duration 10‑14 days.
• Analgesia – acetaminophen or NSAIDs for pain control.

Rehabilitation phase (weeks 3‑8)

• Physical therapy – gentle cervical range‑of‑motion exercises, postural training, and proprioceptive drills once the collar is removed.
• Muscle strengthening – deep neck flexor strengthening to support cervical stability.

Surgical intervention

Surgery is reserved for:

• Failure of conservative treatment after 4‑6 weeks.
• Progressive neurological deficit.
• Severe Type III‑IV subluxations with >5 mm anterior translation.

Procedures may include posterior C1‑C2 fusion, transoral odontoid reduction, or instrumentation with screws, depending on the anatomy and surgeon expertise.

Follow‑up

Repeat imaging (CT or dynamic X‑ray) is performed at 4‑6 weeks to confirm alignment before collar removal. Long‑term follow‑up at 6 months and 1 year ensures no late recurrence.

Living with Grisel’s Syndrome

Even after successful treatment, patients may need ongoing strategies to protect the cervical spine.

• Maintain good posture – ergonomic workstation, avoid prolonged forward head posture.
• Gentle neck stretches – performed daily, avoiding extreme rotation.
• Activity modification – limit contact sports or activities with high neck strain for at least 3‑6 months.
• Regular check‑ups – keep scheduled visits with your ENT or orthopaedic surgeon.
• Vaccinations – up‑to‑date immunizations (e.g., influenza, pneumococcal) to reduce risk of severe upper‑respiratory infections.

Prevention

Because the syndrome follows infection or inflammation, primary prevention focuses on early treatment of neck‑related infections and careful handling of the cervical spine.

• Prompt medical evaluation of sore throat, ear pain, or swollen neck nodes.
• Complete prescribed antibiotic courses for bacterial tonsillitis or otitis media.
• Use gentle positioning during ENT examinations; avoid forced neck extension or rotation.
• Educate caregivers on signs of abnormal head posture in children.
• In children with known ligamentous laxity, discuss prophylactic collar use during severe infections with your physician.

Complications

If unrecognized or inadequately treated, Grisel’s syndrome can lead to serious outcomes:

• Spinal cord compression – causing quadriparesis, respiratory compromise, or permanent neurologic deficit.
• Persistent torticollis – may become fixed, requiring surgical release.
• Chronic cervical instability – increasing risk of future subluxations.
• Vascular injury – rare vertebral artery compromise leading to stroke‑like symptoms.

When to Seek Emergency Care

References

1. Centers for Disease Control and Prevention (CDC). “Rare Cervical Spine Infections and Sub‑luxations.” 2023.
2. Mayo Clinic. “Atlanto‑axial subluxation (Grisel’s syndrome).” Updated 2022.
3. National Institutes of Health (NIH). “Management of Pediatric Cervical Spine Injuries.” 2021.
4. Cleveland Clinic. “Neck Pain and Torticollis – Causes and Treatment.” 2023.
5. World Health Organization (WHO). “Guidelines for the Treatment of Upper Respiratory Tract Infections.” 2022.
6. Fielding JW, Hawkins RJ. “Atlanto‑axial rotatory fixation in children.” J Bone Joint Surg Am. 1977;59(7):968‑975.

```