Zygomatic Arch Fracture – Complete Medical Guide

Overview

The zygomatic arch is the bony “cheekbone” that forms the lateral contour of the mid‑face and provides attachment for the temporalis muscle, a key mover in chewing. A zygoma‑tic arch fracture (also called a zygomatic or cheekbone fracture) is a break in this bone, usually caused by a direct blow to the side of the face.

Who it affects: The injury is most common in males (≈ 75 % of cases) and peaks in the 15‑30‑year age group, reflecting higher participation in contact sports, motor‑vehicle collisions, and physical altercations. However, elderly individuals can also sustain fractures from falls.

Prevalence: Maxillofacial fractures represent 10‑25 % of all facial injuries; among them, isolated zygomatic arch fractures account for roughly 5‑10 %^[1][2]. In the United States, an estimated 250 000 facial fractures occur annually, with 15‑20 % involving the zygomatic arch.^[3]

Symptoms

Symptoms may appear immediately after trauma or develop over the next few hours as swelling increases.

• Visible deformity – a flattened or “sunken” appearance of the cheek.
• Swelling & bruising – often extending to the temporal region and lower eyelid.
• Pain – localized pain over the arch, worsened by jaw movement or pressure.
• Difficulty opening the mouth (trismus) – due to spasm of the temporalis muscle.
• Clicking or popping sensation when moving the jaw.
• Numbness or tingling in the cheek or lateral forehead (injury to the infraorbital or zygomaticofacial nerve).
• Eye symptoms – double vision (diplopia) or limited eye movement if the fracture extends into the orbital rim.
• Hearing changes – a “whooshing” sound (pulsatile tinnitus) if the fracture involves the temporal bone.
• Dental malocclusion – misalignment of the bite if the fracture is part of a more complex mid‑face injury.

Causes and Risk Factors

Common Causes

• Motor‑vehicle collisions – occupants not wearing seat belts or airbags.
• Falls – especially onto a hard surface; common in children and older adults.
• Contact sports – football, boxing, rugby, martial arts, and skateboarding.
• Physical assaults – punches, kicks, or being struck with a blunt object.
• Work‑related injuries – construction, metalwork, or other occupations with risk of impact.

Risk Factors

• Male sex and young age (higher activity level).
• Alcohol or drug use that impairs judgment or coordination.
• Use of protective equipment (or lack thereof) – e.g., helmets, face guards.
• Pre‑existing bone conditions such as osteoporosis, which can lower fracture threshold.

Diagnosis

Accurate diagnosis combines a thorough history, physical exam, and imaging.

Clinical Examination

• Inspection for asymmetry, swelling, ecchymosis.
• Palpation of the cheekbone for step-offs or mobility.
• Assessment of cranial nerve function, especially the infra‑orbital (V2) and facial nerves.
• Evaluation of jaw range of motion and occlusion.

Imaging Studies

• Plain radiographs (X‑ray) – lateral and Waters views give a quick overview; however, they may miss nondisplaced fractures.
• Computed Tomography (CT) scan – the gold standard. Thin‑slice (≤1 mm) axial, coronal, and sagittal reconstructions delineate fracture lines, displacement, and involvement of the orbital floor.^[4]
• 3‑D reconstructions – useful for surgical planning, especially in complex or comminuted fractures.
• In rare cases, magnetic resonance imaging (MRI) may be required to assess soft‑tissue injury (e.g., muscle entrapment).

Treatment Options

The goal is to restore facial symmetry, function, and prevent long‑term complications.

Conservative (Non‑Surgical) Management

• Observation – small, minimally displaced fractures with no functional impairment may be monitored.
• Analgesia – acetaminophen or NSAIDs (ibuprofen 400‑600 mg q6‑8 h) for pain and inflammation, unless contraindicated.
• Cold compresses – applied for the first 48 hours to reduce swelling.
• Soft diet – avoids excessive chewing for 1‑2 weeks.
• Physiotherapy – gentle jaw‑opening exercises after 1 week to prevent trismus.

Surgical Intervention

Indicated for displaced fractures, facial asymmetry, trismus, nerve dysfunction, or associated orbital injuries.

1. Open Reduction and Internal Fixation (ORIF) – a small incision (often a temporal or intra‑oral approach) allows the surgeon to realign the bone and secure it with titanium plates and screws.^[5]
2. Closed reduction – in selected cases, a surgeon may manually reposition the arch using a “Gillies” or “Keen” technique without incisions; stabilization is then achieved with a maxillomandibular fixation (MMF) for a few days.
3. Adjunctive procedures – if the fracture extends to the orbital floor, reconstruction with porous polyethylene or titanium mesh may be performed concurrently.

Post‑operative care typically includes a 5‑7 day course of antibiotics (e.g., amoxicillin‑clavulanate) to prevent sinus infection, pain control, and a soft‑diet for 2‑3 weeks.

Lifestyle and Home Care

• Avoid smoking and alcohol for at least 4 weeks, as they impair bone healing.
• Maintain good oral hygiene to reduce sinus infection risk.
• Follow-up imaging (usually a repeat CT or plain X‑ray) 4‑6 weeks post‑op to confirm proper healing.

Living with Zygomatic Arch Fracture

Recovery varies but most patients return to normal activities within 6‑8 weeks.

Daily Management Tips

• Head elevation (30‑45°) while sleeping reduces swelling.
• Gentle facial massage (after the first week) can improve circulation.
• Jaw exercises – open the mouth slowly to a comfortable width, hold 5 seconds, repeat 5‑10 times, 3‑4 times daily.
• Nutrition – focus on high‑protein foods (lean meat, legumes, dairy) to support bone healing.
• Protective gear – if you return to sports, wear a properly fitted face guard or helmet.
• Psychological support – facial injuries can affect self‑image; counseling or support groups can be beneficial.

Follow‑up Schedule

1. 1‑week post‑injury: wound check (if surgery) and pain assessment.
2. 4‑6 weeks: clinical exam + imaging to confirm bone union.
3. 3‑6 months: evaluation of facial symmetry, nerve recovery, and occlusion.

Prevention

• Wear protective equipment – helmets with face shields for motorcycling, bicycling, and high‑impact sports.
• Use seat belts and ensure airbags are functional in vehicles.
• Maintain bone health – adequate calcium (1,000 mg/day) and vitamin D (600‑800 IU/day) intake; weight‑bearing exercise.
• Limit alcohol consumption and avoid high‑risk behaviors that increase assault or accident likelihood.
• Implement fall‑prevention strategies at home for older adults (remove loose rugs, install grab bars, improve lighting).

Complications

If left untreated or inadequately treated, a zygomatic arch fracture can lead to:

• Persistent facial asymmetry – cosmetic deformity that may require revision surgery.
• Chronic trismus – limited mouth opening affecting nutrition and speech.
• Neuropathic pain or numbness due to infra‑orbital or zygomatic nerve injury.
• Orbital complications – enophthalmos (sunken eye), diplopia, or infra‑orbital swelling.
• Sinusitis – communication between the fracture site and maxillary sinus can cause recurrent infections.
• Temporomandibular joint (TMJ) dysfunction – altered bite mechanics.
• Osteomyelitis – rare bone infection, especially after open fractures.

When to Seek Emergency Care

References

1. American Association of Oral and Maxillofacial Surgeons. “Epidemiology of Maxillofacial Trauma.” AAOMS, 2022.
2. Mayo Clinic. “Facial fractures.” Mayo Clinic Proceedings, 2021.
3. Centers for Disease Control and Prevention. “Injury Prevention & Control: Facial Fractures.” CDC, 2020.
4. National Institutes of Health. “CT Imaging of Upper Facial Fractures.” Radiology Review, 2023.
5. Cleveland Clinic. “Zygomatic Arch Fracture Treatment.” Cleveland Clinic Health Essentials, 2022.