Zygomatic Arch Fracture – A Patient‑Friendly Medical Guide

Overview

The zygomatic arch is the bony “cheekbone” that forms the lateral border of the eye socket and connects the zygomatic bone (cheek) to the temporal bone of the skull. A zygomatic arch fracture occurs when a break runs across this curved structure, typically after a direct blow to the side of the face.

• Who it affects: Most commonly adults aged 15‑45, but children and older adults can be injured as well.
• Prevalence: Facial fractures represent ~10–15% of all traumatic injuries. Of these, isolated zygomatic‑arch fractures account for roughly 5–10% (≈ 30 000–50 000 cases per year in the United States)【1】.
• Typical setting: Sports collisions, motor‑vehicle accidents, physical assaults, or falls onto a hard object.

Because the arch is prominent, a fracture is often visible as a flattening or depression of the cheek, and it can affect chewing, vision, and facial symmetry.

Symptoms

Symptoms can range from mild discomfort to severe pain and functional impairment. Common findings include:

• Localized pain over the cheekbone, worsened by jaw movement.
• Swelling and bruising (ecchymosis) that may spread to the lower eyelid or temple.
• Visible depression or flattening of the cheek.
• Difficulty opening the mouth (trismus) due to muscle spasm or involvement of the masseter muscle.
• Altered sensation (numbness or tingling) in the cheek or upper lip if the infraorbital nerve is affected.
• Clicking or grinding sounds when opening/closing the jaw (temporomandibular joint involvement).
• Limited eye movement or double vision if the fracture extends into the orbital rim.
• Dental malocclusion (misaligned bite) when the fracture disrupts the normal relationship of the maxilla.
• Audible “crack” at the time of injury, reported by some patients.

Causes and Risk Factors

Primary Causes

• Blunt trauma – direct impact from a baseball bat, fist, or steering wheel.
• Motor‑vehicle collisions – especially side‑impact crashes where the head strikes the car door or window.
• Falls – from heights or slipping and striking the cheek on a hard surface.
• Sports injuries – contact sports (football, rugby, boxing, martial arts) and high‑speed activities (skiing, mountain biking).
• Physical assault – punches or blunt objects.

Risk Factors

• Male gender (≈ 70% of cases) due to higher participation in high‑risk activities.
• Alcohol or drug use that impairs judgment and coordination.
• Pre‑existing bone disorders (osteoporosis, osteogenesis imperfecta) that weaken facial bones.
• Use of protective equipment that does not cover the cheek (e.g., helmets without face shields).
• Previous facial fractures that may alter bone architecture.

Diagnosis

Prompt, accurate diagnosis is essential to restore facial symmetry and prevent complications.

Clinical Examination

• Inspection for swelling, bruising, asymmetry, and step deformities.
• Palpation of the arch to identify tenderness, crepitus, or movement of bony fragments.
• Neurologic exam for infraorbital nerve sensation.
• Assessment of jaw range of motion and dental occlusion.

Imaging Studies

• Plain Radiographs (X‑ray): Lateral and Waters (occipitomental) views can show obvious displacement, but they miss subtle fractures.
• Computed Tomography (CT) Scan: The gold standard. Thin‑section axial, coronal, and 3‑D reconstructions delineate fracture lines, displacement, and involvement of the orbital floor or sinus.
• CT Angiography: Reserved for high‑energy trauma if vascular injury is suspected.

Classification

Surgeons often use the Le Fort or Zygomatic complex (ZMC) classification to decide if the fracture is isolated to the arch or part of a more extensive mid‑facial injury. Isolated arch fractures (type “A”) are usually treated conservatively, while ZMC fractures (type “B”) may need operative fixation.

Treatment Options

Treatment aims to restore facial contour, protect the eye, and re‑establish normal function.

Non‑Surgical Management

• Observation: Small, nondisplaced fractures (<5 mm displacement) often heal without surgery.
• Cold compresses and elevation of the head to reduce swelling.
• Analgesics: Acetaminophen or ibuprofen (up to 800 mg every 6 h) for pain and inflammation, unless contraindicated.
• Soft‑diet: Avoid chewing on the affected side for 1–2 weeks.
• Stitches: If overlying skin lacerations exist, they are repaired before swelling subsides.
• Follow‑up imaging 1–2 weeks later to confirm proper healing.

Surgical Intervention

Indicated when displacement >5 mm, malocclusion, infraorbital nerve entrapment, or aesthetic deformity.

1. Open Reduction & Internal Fixation (ORIF): A small incision (temporal or sub‑zygomatic) allows direct visualization. Mini‑plates and screws (often titanium) realign the arch.
2. Closed Reduction: In selected cases, a surgeon may manually reposition the bone using a “Gillies” or “Keen” technique, followed by percutaneous fixation.
3. Adjunctive procedures: If orbital floor fractures coexist, a separate repair with porous polyethylene or titanium mesh may be required.

Post‑operative care includes antibiotics (e.g., amoxicillin‑clavulanate 875/125 mg BID for 5 days) to prevent sinusitis, analgesics, and a soft diet for 1‑2 weeks. Sutures are typically removed 5‑7 days after surgery.

Rehabilitation

• Gentle jaw‑opening exercises after 1 week to prevent trismus.
• Physical therapy for facial muscles if stiffness persists.
• Regular dental check‑ups to ensure occlusion remains stable.

Living with a Zygomatic Arch Fracture

Daily Management Tips

• Ice application: 15 minutes on, 15 minutes off for the first 48 hours.
• Head elevation: Use pillows to keep the head >30° while sleeping.
• Oral hygiene: Rinse with a saline solution (½ tsp salt in 8 oz water) after meals to reduce infection risk.
• Nutrition: Choose protein‑rich smoothies, soups, and yogurts to support bone healing.
• Avoid straws: Suction can increase intra‑oral pressure and strain the fracture site.
• Protect the face: Wear a protective face mask or shield during high‑risk activities for at least 6 weeks.
• Monitor sensation: Keep a diary of any numbness or tingling; persistent changes beyond 3 months warrant neurologic evaluation.

Emotional & Cosmetic Considerations

Facial injuries can be distressing. Counseling, support groups, or referral to a mental‑health professional can help with body‑image concerns. If residual asymmetry remains after healing, a cosmetic surgeon may discuss secondary contouring (e.g., implant placement).

Prevention

• Wear appropriate protective gear: Full‑face helmets for motorcycling, face shields for contact sports, and padded helmets for bicycling.
• Alcohol moderation: Reduces the risk of falls and assaults.
• Home safety: Install handrails, non‑slip mats, and adequate lighting.
• Strengthen bones: Ensure adequate calcium (1,000 mg/day) and vitamin D (600–800 IU/day) intake; weight‑bearing exercise supports bone density.
• Prompt treatment of dental or sinus infections: Chronic infections can weaken adjacent bone.

Complications

If not properly managed, a zygomatic arch fracture can lead to:

• Malunion or non‑union: Persistent deformity or weakness.
• Persistent facial asymmetry: May require revision surgery.
• Infraorbital nerve injury: Long‑term numbness, dysesthesia, or neuropathic pain.
• Temporomandibular joint (TMJ) dysfunction: Chronic jaw pain, clicking, or restricted opening.
• Sinusitis or chronic maxillary sinus disease: Due to communication between the fracture site and sinus.
• Orbital complications: Diplopia, enophthalmos, or globe injury if the fracture extends into the orbital rim.
• Infection: Osteomyelitis is rare but possible, especially with open fractures.

When to Seek Emergency Care

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**References**

1. Mayo Clinic. “Facial bone fractures.” Updated 2023. mayoclinic.org.
2. Centers for Disease Control and Prevention. “Traumatic Brain Injury & Facial Injuries – 2022 Data.” cdc.gov.
3. American College of Surgeons. “Management of Zygomaticomaxillary Complex Fractures.” Journal of Oral and Maxillofacial Surgery, 2021.
4. Cleveland Clinic. “Facial Bone Fractures: Symptoms and Treatment.” 2022. clevelandclinic.org.
5. World Health Organization. “Global Burden of Injuries 2020.” WHO Press, 2021.