A female patient who fell from a two‑wheeler and struck her mandible now presents with trismus, tenderness, and swelling of the right mandibular region; what is the likely diagnosis and appropriate management?

Diagnosis and Treatment of Post-Traumatic Mandibular Injury

The diagnosis is a mandibular fracture (likely involving the right body, angle, or condyle), and the patient requires immediate CT maxillofacial imaging with multiplanar reformations to confirm the fracture location, displacement, and comminution, followed by surgical open reduction and internal fixation (ORIF) if the fracture is displaced or comminuted.

Clinical Diagnosis

The triad of trismus, localized tenderness, and swelling over the right mandibular region following direct trauma is pathognomonic for mandibular fracture. The trismus specifically suggests either:

• Involvement of the mandibular angle (most common site)
• Condylar/subcondylar fracture affecting temporomandibular joint mechanics
• Muscle spasm from adjacent fracture fragments

Additional clinical findings to assess immediately:

• Malocclusion (inability to achieve normal bite)
• Step deformity along the inferior border on palpation
• Paresthesia of the lower lip/chin (indicating inferior alveolar nerve injury)
• Intraoral lacerations or exposed bone
• Dental mobility or missing teeth at fracture site

Diagnostic Imaging

CT maxillofacial with multiplanar reformations is the gold standard and should be obtained immediately 1. This modality is nearly 100% sensitive for detecting mandibular fractures and provides critical information that directly changes surgical management 1.

Why CT is Essential:

• Detects comminution and displacement - these findings mandate surgical intervention 1
• Superior for posterior fractures (ramus, angle, condyle) where displacement can be subtle 1
• 3D reconstructions are critical for preoperative surgical planning 1
• Identifies multiple fractures - remember that 20-40% of mandibular fractures have additional fractures elsewhere 1

Alternative Imaging (Suboptimal):

Orthopantomogram (OPG) has 86-92% sensitivity but misses condylar fractures, nondisplaced fractures, and minimally displaced anterior fractures 1. It should only be used if CT is unavailable or clinical suspicion is very low 1.

Critical Associated Injuries to Screen For:

• Intracranial injury occurs in 39% of mandibular fracture patients - obtain head CT if any altered mental status, loss of consciousness, or neurological symptoms 1
• Cervical spine injury occurs in 11% - maintain cervical precautions until cleared 1

Treatment Algorithm

Indications for Surgical Management (ORIF):

Absolute indications:

• Displaced fractures
• Comminuted fractures
• Fractures causing malocclusion
• Bilateral fractures
• Angle fractures (most require surgery)
• Condylar fractures with significant displacement or ramus height shortening

Your patient likely requires surgery given the presence of trismus and significant swelling, which typically indicate displacement or muscle interference.

Surgical Approach:

For body/angle fractures:

• Intraoral approach is preferred - infection rates are equivalent to extraoral (5.9% vs 10%) with no increased risk despite oral microbiome exposure 2
• Use dual miniplate fixation (superior and inferior border) for optimal stability, especially in angle fractures 3
• Single inferior border plating has the least stability and higher failure rates 3

For condylar/subcondylar fractures:

• Nonsurgical treatment is acceptable if: minimal occlusal discrepancy, adequate mouth opening, minimal condylar displacement, and minimal ramus height shortening 4
• However, significant displacement or functional impairment requires open reduction

Fixation Principles:

• 2.0mm miniplates are standard for most mandibular fractures
• Load-bearing plates (thicker, stronger) required for: comminuted fractures, atrophic mandibles, or when dual plating cannot be achieved
• Intermaxillary fixation (IMF) for 2-4 weeks post-operatively to maintain occlusion during healing

Tooth Management at Fracture Site:

Remove tooth if:

• Fractured or non-restorable
• Preventing fracture reduction
• Associated with infection

Preserve tooth if:

• Intact and helps maintain fracture alignment
• No signs of infection

Post-Operative Management

• Pain control: Multimodal analgesia
• Antibiotics: Perioperative coverage (typically 24-48 hours)
• Soft diet: 4-6 weeks
• Kinesio taping: Reduces swelling, pain, and trismus significantly 5
• Monitor for complications: infection (5-10%), malocclusion, inferior alveolar nerve paresthesia, non-union

Critical Pitfalls to Avoid

1. Missing second fractures: Mandible often fractures in two places - always image the entire mandible 1
2. Relying on OPG alone: Will miss condylar fractures and subtle displacement 1
3. Undertreating angle fractures: These have high complication rates and usually require dual plating 3
4. Ignoring associated injuries: Screen for head and cervical spine trauma 1
5. Inadequate fixation: Single inferior border plates have highest failure rates 3

Bottom line: This patient needs CT maxillofacial imaging now, followed by surgical consultation for likely ORIF with dual miniplate fixation via intraoral approach.