Condylar Fracture
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Direct answer
A condylar fracture is a break of the mandibular condylar process — head (intracapsular), neck or subcondylar base — usually from a blow to the chin, with the fragment typically displaced anteromedially by the lateral pterygoid pull. Most fractures in adults are treated closed: a short period of intermaxillary fixation or training elastics followed by early mobilisation and physiotherapy, because the joint remodels and occlusion usually settles. Open reduction with internal fixation is reserved for defined indications — displacement into the middle cranial fossa, displacement of the fragment into a position unreachable by closed means, loss of occlusion unmanageable elastically, lateral extracapsular dislocation, and some bilateral fractures with an open bite. In children, conservative treatment with early movement is the rule, since immobility courts ankylosis.
What you must remember
- Levels (Lindahl framework): condylar head (intracapsular, including diacapitular), condylar neck, and subcondylar (base) fractures; each may be undisplaced, deviated, displaced with medial overlap, or dislocated out of the fossa.
- Displacement direction: anteromedial dominates because the lateral pterygoid attaches to the pterygoid fovea and pulls the proximal fragment forward and inward.
- Clinical signature: unilateral fracture — deviation of the midline to the fractured side on opening, ipsilateral preauricular tenderness, and an ipsilateral premature posterior occlusal contact; bilateral fractures — anterior open bite and pain over both joints.
- Closed treatment: 2-3 weeks of intermaxillary fixation or, more often today, guiding elastics with early function; physiotherapy prevents fibrous stiffening.
- Open reduction indications to recite: fragment in the middle cranial fossa, dislocation into the infratemporal region, impossible occlusion by closed means, lateral extracapsular dislocation, foreign body, and some bilateral cases with gross open bite.
- Children are different: conservative, near-immediate mobilisation, because the condyle is the growth centre and prolonged fixation risks ankylosis; intracapsular head fractures in children carry the highest ankylosis risk.
- Imaging: OPG plus a reverse-Towne's or, better, CT with three-dimensional reconstruction to map displacement.
Working through a unilateral case
A 24-year-old reports a chin-lacerating fall and cannot close properly; the midline deviates to the left on opening, and the left preauricular region is tender. Palpation of both condyles during opening — a manoeuvre students forget — shows absent translation on the left. OPG and CT reveal a left subcondylar fracture with anteromedial displacement but the fragment remains in contact. This is a textbook closed-treatment candidate: occlusion is restored with arch bars, light guiding elastics are used for two to three weeks rather than rigid wire fixation, and hot compresses with jaw exercises follow. Had the patient presented with a bilateral fracture and a gagging anterior open bite, the calculus shifts — at least one side, often the more displaced, is opened (retromandibular transparotid or preauricular approach) and fixed with two miniplates or a delta plate, because prolonged maxillomandibular fixation of both joints in an adult risks permanent stiffness and open bite. The child version of this case, an eight-year-old with a diacapitular head fracture, gets no fixation at all: a week of soft diet and analgesia, early movements, and follow-up for years, since remodelling is generous but ankylosis is the feared, lifelong complication.
How examiners frame it
The viva almost always opens with "why do most condylar fractures not need surgery?" — the expected reasoning is access of the lateral pterygoid, remodelling capacity, and the fact that occlusion, not anatomy, is the treatment target. The second probe is the direction question: candidates who say posterolateral displacement have reversed the muscle. The classic Indian short-note pair is condylar fracture versus ankylosis in children: examiners want the sequence intracapsular fracture, haemarthrosis, immobilisation, fibrous then bony ankylosis, and hence the doctrine of early mobilisation in paediatric injuries. Finally, be ready to name one approach and its nerve risk — the retromandibular transparotid route spares the facial nerve in most hands, while the preauricular approach suits higher fragments.
Frequently asked questions
In which direction is the proximal fragment usually displaced?
Anteromedially, because the lateral pterygoid muscle pulls the fragment forward and inward from the pterygoid fovea.
What occlusal findings suggest bilateral condylar fractures?
An anterior open bite with premature contact of the posterior teeth bilaterally, plus bitemporal pain and limited protrusion.
When is open reduction indicated in a condylar fracture?
For displacement into the middle cranial fossa, lateral dislocation, gross displacement with occlusion unachievable closed, foreign body, and selected bilateral fractures with open bite.
Why are condylar fractures in children treated with early movement?
The condyle is the mandible's growth centre, and prolonged immobilisation of an intracapsular injury predisposes to fibrous or bony ankylosis.
Which radiographs best demonstrate a condylar fracture?
An orthopantomogram supplemented by CT with coronal and three-dimensional reconstruction; a reverse-Towne's view is the traditional plain film option.