mandible fractures - university of texas medical branch · pdf file• superior sensitivity...
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Mandible Fractures: Evaluation and Management
Joseph L. Russell, MD
Faculty Advisor: Tammara Watts, MD
Department of Otolaryngology—Head & Neck Surgery
The University of Texas Medical Branch (UTMB Health)
Grand Rounds Presentation
March 29, 2013
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Overview
• Review of anatomy
• Review of occlusion
• Types and locations of fractures
• Patient evaluation and initial management
• Definitive Management
• Timing of fracture repair
• Maxillomandibular fixation
• Open reduction and internal fixation (ORIF)
• Post-operative care
• Complications
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Anatomy
• Regions
• Symphysis
• Parasymphyseal region—spans canine to canine
• Body—from canine to angle
• Alveolar process—contains teeth, resorbs if teeth are lost
• Angle—non-tooth bearing region between body and ramus
• Ramus
• Condyle
• Coronoid process
• Inferior alveolar/mental nerves
• Muscle attachments
• Weak points
• Condylar neck
• Angle—especially if third molar is present
• Mental foramen Cummings/Ballenger
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Dingman RO, Natvig P: Surgery of facial fractures, Philadelphia, 1964, Saunders
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Cummings Fig 12-15
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Occlusion Angle’s Classification
Class I: mesiobuccal cusp of the maxillary first molar rests within the mesiobuccal groove of the mandibular first molar
Class II: maxillary molar is more anterior (retrognathic)
Class III: maxillary molar is more posterior (prognathic)
Small Figure—Ballenger’s Fig 55-1
Large Figure—Myer’s Fig 92-5
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Crossbite
• Normal: maxillary buccal cusps lie lateral to the mandibular buccal
cusps
• Lingual crossbite: maxillary buccal cusps are positioned medially
• Buccal crossbite: maxillary buccal cusps are positioned laterally
Ballenger’s
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Fracture classification
• Simple/Compound/Comminuted/Greenstick
• Anatomic location
• Dentition status
• Stability
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Fracture classification
• Simple
• Oral mucosa and external skin are intact
• Compound (open)
• Laceration of mucosa or skin is present
• Fracture passes into a tooth root
• Greenstick
• Involves only one cortex
• Most common in children
• Comminuted
• Multiple fragments of bone
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Fracture
Classification
Anatomic location
- Condyle
- Body
- Angle
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Fracture classification
• Dentition status
• Dentulous
• Edentulous
• Decreased mandibular height
• Tenuous blood supply
• Superficial location of the mental forarmen
• Accuracy of re-approximation less important
• Pediatric
• Unerrupted dentition must be avoided
• Deciduous teeth hold wire poorly
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- Stability: Favorable vs unfavorable
• Due to upward forces of the temporalis and masseter and downward forces of the suprahyoid musculature
• Almost all angle fractures are unfavorable
Favorable (A) vs
unfavorable (B)
fractures.
Temporalis and
masseter forces on the
proximal fragment, and
igastric/suprahyoid
musculature forces on
the distal segment,
stabilize the fracture in
A but destabilize it in B.
Myer’s Operative Otolaryngology Fig 92-2
FRACTIRE CLASSIFICATION
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Patient evaluation
• ABC’s take precedence
• Airway
• Integrity must be ensured
• Sources of compromise
• Soft tissue swelling
• Nasal/oral/oropharyngeal bleeding
• Bilateral mandible body fractures—loss of tongue support
• Concomitant laryngeal/tracheal injuries
• Low threshold to establish a definitive airway
• Intubation
• Tracheotomy Cummings/Ballenger
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Patient evaluation
• Cervical spine injury
• Must be ruled out in all patients
• Rate is 5% to 8% if an isolated facial fracture is present
• Rate is 7 to 11% if 2 or more facial fractures are present
• Stabilize cervical spine with C-collar at presentation
Mulligan RP, Mahabir RC. The prevalence of cervical spine injury,
head injury, or both with isolated and multiple craniomaxillofacial
fractures. Plast Reconstr Surg 2010;126:1647.
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Patient Evaluation
• History
• Often limited by patient being intubated, unconscious, intoxicated, etc
• Mechanism
• Assault, motor vehicle collision, fall, gunshot
• If patient is conscious and cooperative, assess for:
• Presence/location of pain
• Subjective malocclusion
• Trismus
• Intraoral bleeding
• Numbness, particularly in the mental nerve region
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Patient evaluation
• Physical Examination
• May be limited by swelling, hematoma, C-collar, tubes
• First assess the general appearance of the face
• Note lacerations, ecchymoses, edema, areas of distortion
• Chin lacerations indicate possible subcondylar fractures
• Palpate the mandible, note sensitive regions, mobility
• Include palpation of the condylar heads through the external auditory canals—pain may indicate presence of condylar head fracture
• Note intraoral mucosal tears, ecchymoses, bleeding
• Occlusion
• Quality of dentition, tooth involvement in fracture lines, fractured teeth
• Missing teeth—if acute, chest x-ray is needed
• Look for deviation of the mandible, premature molar contact, open bite, crossbite, trismus
• Full cranial nerve examination if patient is conscious, with special focus on cranial nerves V and VII
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Patient evaluation
• Radiography
• Panoramic tomography (Panorex)
• Superior sensitivity for mandible fractures than 3 mm CT scans
Preferred by some surgeons as the sole imaging modality of the mandible
• Non-contrasted maxillofacial computed tomography (CT)
• 1 mm fine cuts have superior sensitivity to Panorex (100% vs 86%)
• Usually obtained in patients due to need to evaluate for other facial fractures
• 3-D reconstructions can be rendered and are helpful in some cases, such as comminuted fractures
Cummings
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Grainger & Allison’s, Fig 63.41; right parasympheseal
and left angle fractures; note full condyle view
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• Right parasymphyseal and left ramus fractures.
• Avery LL, Susarla SM, Novelline RA. Multidetector and three-dimensional CT evaluation
of the patient with maxillofacial injury. Radiol Clin N Am 49 (2011) 183–203.
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• Right ramus and left anterior body fractures
• Marx: Rosen’s Emergency Medicine, Figure 39-7
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Management
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Initial management
• With rare exception, mandible fractures are not surgical emergencies
• If surgical intervention is needed, it should be undertaken as soon as it is safe to do so
• Soft diet
• Pain control
• Antibiotics for all open fractures (includes fractures involving tooth roots)
• Penicillins, cephalosporins, and clindamycin are appropriate options
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Timing of repair
• Champy and others once advocated repair within 24 hours
• Often not feasible, commonly resulting in delays
• Barker et al, Laryngoscope 2011, University of Virginia
• Retrospective chart review of 83 patients over 5 years
• Mean time to fixation was 6.7 days
• No correlation found between increased time to repair and rate
of complications (infection, nonunion, malunion)
• Trend found between fewer complications and increasing time
to surgical repair
Barker DA, Oo KK, Allak A, et al. Timing for repair of mandible fractures.
Laryngoscope 2011;121:1160-3.
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Antibiotics
• Numerous studies have shown no benefit with routine use of post-operative antibiotic therapy beyond 24 hours
• There is, however, evidence to support pre and perioperative antibiotic use
• Any fracture extending to the dentoalveolar ridge is an open fracture and requires antibiotic therapy
• Closed condyle fractures do not require antibiotics
• Ancef 1 g IV prior to surgery then one additional dose 8 hours later
• Reduced mandible fracture infection rate from 42% to 14% in a prospective clinical trial by Chole and Yee
• Andreasen JO, Jensen SS, Schwartz O, et al. A systematic review of prophylactic antibiotics in the treatment
of maxillofacial fractures. J Oral Maxillofac Surg 2006;64:1664-8
• Miles BA, Potter JK, Ellis E. The efficacy of postoperative antibiotic regimens in the open treatment of
mandibular fractures: a prospective randomized trial. J Oral Maxillofac Surg 2006;64:576-82
• Chole RA, Yee J. Antibiotic prophylaxis for facial fractures. Arch Otolaryngol Head Neck Surg
1987;113:1055
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Teeth in the
fracture line
• Prior to routine antibiotic use, pulling an involved
tooth was recommended to reduce the incidence of
infection
• Current recommendations are to remove a tooth in the
fracture line if it is carious, if the tooth or its root are
fractured, or if the presence of the tooth is preventing
proper fracture reduction
• Removal of the third molar tends to destabilize angle
fractures and should be avoided if possible
Cummings
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Definitive
management
• Soft diet
• Optimal treatment for some non-displaced ramus fractures and subcondylar fractures
• Must be no malocclusion
• Closed reduction—maxillomandibular fixation (MMF)
• Arch bars
• Eyelet wires
• IMF screws
• Open reduction and internal fixation (ORIF)
• Mini plates vs larger reconstruction plates
• Lag screws
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General Principles
• Restore the patient’s pre-morbid occlusion
• Repair both skeletal and soft tissue injuries
• Use lacerations when possible
• Use mucosal incisions when possible
• Reduce all fractures
• Stabilize fractures
• Fixate all fractures adequately to allow bone healing
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Closed Reduction:
Indications
• Nondisplaced favorable fractures
• Pediatric fractures
• Open reduction best avoided due to risk of injuring tooth buds
• Grossly comminuted fractures
• Avoids periosteal stripping of the bone fragments
• Condyle fractures
• Controversial, though closed treatment is generally appropriate
• Bilateral condyle fractures can result in loss of mandibular
height if closed reduction is the only treatment
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Closed Reduction: ContraIndications
• Compromised pulmonary function
• Severe asthma
• Severe COPD
• Poorly controlled seizures
• Severe nausea
• Psychiatric or neurologic disorders
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Closed
Reduction
Erich arch bars
- Standard for MMF
- Use 24 gauge circumdental wire to
fasten each bar to the dentition
- Lugs must open AWAY from the
crowns of the teeth
- Place patient in maximum
intercuspation and place MMF
wires or elastics
Ballengers: Fig 55-17
Text from Resident Manual
Text from Resident Manual
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Closed
reduction
IMF screws
- 2.5 mm self-drilling and
self-tapping screws
- Placed adjacent to the
canine tooth roots
- Alternative if arch bars
cannot be applied or for
temporary MMF during
ORIF AO foundation website
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ORIF: Indications
• Displaced unfavorable angle fractures
• Complex facial fractures requiring a stable mandibular base
• Atrophic edentulous mandibles with minimal cancellous
bone, and poor osteogenesis and healing potential
• Some condyle fractures
• Absolute indications
• Displacement into the middle cranial fossa or EAC
• Inability to obtain adequate occlusion
• Lateral extracapsular dislocation
• Contaminated open joint wound
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ORIF: Approaches
• Intraoral
• Preferred
• More direct
• No external scars
• Low risk to the facial nerve
• Disadvantage—decreased exposure
• External
• Improved exposure of the posterior body, angle, and ramus
• Often required for severely comminuted fractures
• Disadvantages—cervical scar, risk of injury to branches of the facial nerve
• Approach chosen should allow adequate exposure to reduce and immobilize the fracture(s)
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ORIF: competing principles
• Arbeitsgemenschaft fur Osteosynthesefragen (AO)
• Large, load-bearing plates
• Bicortical screws
• Champy
• Small, load-sharing plates
• Monocortical screws
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ORIF: competing principles
• Bouloux et al (Emory), J Oral Maxillofac Surg, 2012
• Randomized, nonblinded, prospective trial over 2 years
• 127 initial patients, 53 of whom completed the required follow up
• Exclusions: clinical infection, previous treatment, comminuted fractures, condyle fractures, gunshot injuries, mandibular atrophy
• Two groups: AO (control) and Champy (experimental)
• All received perioperative antibiotics, follow up was at least six weeks, and no MMF was used
• Top fracture types
• 42% had a left angle fracture
• 23% had a right parasymphyseal fracture
• 19% had a right angle fracture
• Primary outcome: fracture union status at 6 weeks
• 81% union in the AO group and 89% in the Champy group (P = 0.95, not significant)
• Complications—no significant difference between groups
• Infection—AO 15% vs Champy 11% (P = 0.70)
• Hardware removal—AO 4% vs Champy 19% (P = 0.19)
• Prolonged antibiotic therapy—AO 12% vs Champy 4% (P = 0.35)
Bouloux GF, Chen S, Threadgill JM. Small and large titanium plates are equally
effective for treating mandible fractures. J Oral and Maxillofac Surg 2012;70:1613-21
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Symphyseal &
Parasymphyseal
fractures
- Intraoral vestibular approach best
- Arch bars placed and MMF wires secured prior to incision
- Incision is made from canine to canine, leaving at least a 1 cm cuff of tissue from the mucogingival junction for closure
- Dissection carried to bone
- Freer used to dissect below the periosteum to the inferior border of the mandible
- Mental nerves identified and preserved
- Fracture line debrided, reduced, and MMF tightened
- Four hole 2.0 mm system titanium plate secured just below the tooth roots with monocortical screws
- Four to six hole 2.3 to 2.7 mm system titanium plate is shaped to the lower border of the mandible and secured with at least two screws on each side
- MMF wires cut and occlusion checked; if satisfactory, incision is closed.
- If no other fractures require the arch bars, they are also removed prior to closing
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Body Fractures - Intraoral approach best
- Arch bars placed and MMF wires secured prior to incision
- 5 cm incision made in the gingivobuccal sulcus over the
fracture, leaving a 1 cm cuff of tissue from the
mucogingival junction for closure
- Mucosa only incision made anteriorly; blunt dissection
used to identify and dissect out the mental nerve from the
labial flap of tissue
- Dissection carried to bone
- Freer used to dissect below the periosteum to the inferior
border of the mandible
- Mental nerves identified and preserved
- Fracture line debrided, reduced, and MMF tightened
- Four hole tension band secured between the tooth roots
and mental foramen with monocortical screws
- Larger 2.3 to 2.7 mm system titanium plate is shaped to
the lower border of the mandible and secured anteriorly
through the intraoral incision with 2-3 screws. If needed,
a percutaneous drill guide is placed in the cheek to reach
the posterior screw holes and 2-3 screws are placed
- MMF wires cut and occlusion checked; if satisfactory,
incision is closed.
- If no other fractures require the arch bars, they are also
removed prior to closure of the incision
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Angle Fractures
- Non-displaced fractures can be
treated with MMF x 6 weeks
- Intra-oral approach is similar to
approach for a body fracture, with
incision more posterior and
extended superiorly over the
external oblique ridge
- Arch bars placed prior to incision,
but MMF is performed after
dissection
- Fracture line is exposed and
reduced
- Plating options include two mini
plates, a superior mini plate and
heavier lower plate, and a 2 mm 8
hole strut plate
- Percutaneous drill guide is required
to drill holes and place the screws
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Angle Fractures - External approach
- 5 cm incision is made 2 to 2.5 cm below the angle of the
mandible and extended posterosuperiorly toward the
earlobe
- Deep subcutaneous dissection is performed inferiorly on
top of the platysma
- Platysma is incised inferiorly and dissection is carried
down to the posterior belly of the digastric
- Once the digastric is identified, dissection is carried
superiorly to the inferior border of the mandible
- Periosteum is incised and a freer is used to elevate the
periosteum from the bone, exposing the fracture
- Fracture is debrided and reduced, and the patient is
placed in MMF
- Plating options include two mini plates, a superior mini
plate and heavier lower plate, and a 2 mm 8 hole strut
plate
- After plating, MMF is released and occlusion checked;
if satisfactory arch bars are removed unless needed for
other fractures
- Intraoral incisions closed with chromic or vicryl suture
- For external approach, platysma is closed with a
running locking vicryl suture, deep dermal interrupted
monocryl sutures are placed, and the skin is closed with
5-0 FAST gut or 5-0 nylon/prolene running suture.
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Ramus Fractures
• Most ramus fractures can be treated with MMF x 6
weeks
• Intraoral plating is very difficult
• External approach for plating is similar to that of angle
fractures
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Condyle Fractures
- Most condyle fractures can be
treated with MMF x 2-4 weeks
- If the head is involved, MMF is
limited to 2 weeks to prevent TMJ
ankylosis
- Frequent scenario is a condyle
fracture with contralateral
parasymphyseal, body, or angle
fracture—treat contralateral fracture
with ORIF and condyle fracture
with MMF x 2-4 weeks
- When plating is required, an
external approach is preferred
- External approach is similar to the
angle approach but with the
superior end of the incision brought
to about 2 cm from the earlobe
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Coronoid fractures
• Uncommon, usually associated with a ZMC fracture
• No treatment is required in the majority of cases
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Postoperative care
• Wire cutters kept at bedside upon leaving the OR and sent home with the patient
• No benefit to extending antibiotics beyond 24 hours post-op
• Oral hygiene is stressed to the patient
• Daily brushing of teeth and arch bars
• Water pick is very effective
• Dental wax to protect the buccal mucosa
• Some authors advocate weekly follow up until arch bars are removed
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Complications
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Infection
• Occurs in 10-15% of patients
• No significant decrease in the infection rate with extended post-op antibiotics
• Thought to result from fracture instability and movement instead of contamination with oral flora
• Predisposing factors
• Local
• Poor reduction/immobilization
• Poorly closed oral wounds
• Fractured teeth in the fracture line
• Diminished blood supply
• Devitalized tissue
• Comminuted fractures
• Systemic
• Alcoholism
• Poorly controlled DM
• Immunocompromise
• Treatment is surgical drainage, removal of infected hardware, and prolonged antibiotic therapy
• Placement of a heavy reconstruction plate may be required
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nonunion
• Occurs in 3-5% of fractures
• Most common cause is inadequate reduction and
immobilization
• Treatment
• Control infection if present
• Debride devitalized tissues
• Remove hardware, freshen fracture ends, and place a new
heavy plate
• Place bone graft if needed
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Malunion
• Improper alignment of the healed bony segments
• Caused by improper reduction, inadequate occlusal
alignment, and inadequate stability of the fracture
• May be clinically insignificant if occlusion is good
• Treatment
• Minor discrepancies can be treated with orthodontics
• Major discrepancies require open surgical repair with
refracturing and/or osteotomies
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TMJ ankylosis
• Mandibular condyle fuses to the glenoid fossa
• Predisposing factors
• Intra-articular hemorrhage
• Condyle head fracture
• Prevention
• Shorter period of MMF (2-3 weeks)
• Physiotherapy
• Definitive treatment may require arthroplasty or total joint replacement
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trigeminal nerve
injury
• Inferior alveolar nerve frequently injured when fracture
involves the mandibular canal
• Mental nerve at iatrogenic risk especially during
parasymphyseal and body fracture repairs
• Important to document deficits prior to surgery
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Facial nerve injury
• In a trauma patient, the nerve can be injured anywhere alone its course
• Main trunk can be injured from fractures or surgery around the condylar neck
• Marginal mandibular branch at risk during submandibular external approaches
• Frontal branch at risk if an external pre-auricular approach is used
• Facial nerve function should be documented prior to surgery
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References
• Donald PJ. Facial fractures. In Ballenger’s Otorhinolaryngology Head and Neck Surgery. 17th ed 2009
• Kellman RM. Maxillofacial trauma. In Cumming’s Otolaryngology: Head and Neck Surgery, 5th ed. 2010
• Dingman RO, Natvig P: Surgery of facial fractures, Philadelphia, 1964, Saunders
• Mulligan RP, Mahabir RC. The prevalence of cervical spine injury, head injury, or both with isolated and multiple craniomaxillofacial fractures. Plast Reconstr Surg 2010;126:1647.
• Avery LL, Susarla SM, Novelline RA. Multidetector and three-dimensional CT evaluation of the patient with maxillofacial injury. Radiol Clin N Am 49 (2011) 183–203.
• Barker DA, Oo KK, Allak A, et al. Timing for repair of mandible fractures. Laryngoscope 2011;121:1160-3.
• Andreasen JO, Jensen SS, Schwartz O, et al. A systematic review of prophylactic antibiotics in the treatment of maxillofacial fractures. J Oral Maxillofac Surg 2006;64:1664-8
• Miles BA, Potter JK, Ellis E. The efficacy of postoperative antibiotic regimens in the open treatment of mandibular fractures: a prospective randomized trial. J Oral Maxillofac Surg 2006;64:576-82
• Bouloux GF, Chen S, Threadgill JM. Small and large titanium plates are equally effective for treating mandible fractures. J Oral and Maxillofac Surg 2012;70:1613-21
• Ochs MW. Fractures of the mandible. In Myers, EN ed. Operative Otolaryngology., 2nd ed 2008.
• Eusterman VD. Mandibular trauma. In Resident Manual of Trauma to the Face, Head, and Neck. Aao—HNS Foundation,, 2012