Abstract
Objective: To present a case of bilateral temporomandibular joint ankylosis that was managed successfully through gap arthroplasty.
 Methods:
 Design: Case report
 Setting: Tertiary Government Hospital
 Patient: One
 Results:
 A 25-year-old man presented with inability to open his mouth for 18 years after direct trauma to his chin. CT scan showed bilateral bony fusion of condyles to glenoid fossae, hypertrophic sclerosis and fusion of the condylar heads to the temporal bones. He underwent bilateral gap arthroplasty via preauricular approach with creation of a 15 mm space on the mandibular fossa. As of latest follow up, the patient maintained an inter-alveolar distance of 30 mm for 5 months postoperatively, through continuous aggressive mouth opening exercises.
 Conclusion: 
 Gap arthroplasty may be an efficient procedure for temporomandibular joint ankylosis in achieving satisfactory post-operative inter-alveolar opening and articular function. Early and meticulous rehabilitation is required to prevent relapse. Long-term follow up is recommended to document possible recurrence.
 
 Keywords: temporomandibular joint ankylosis, gap arthroplasty, TMJ ankylosis, ankylosis
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