Ankylosis of Temporomandibular Joints After Mandibular Distraction Osteogenesis in the Patients of Nager Syndrome: Report of Two Cases and Literature Review

Nager syndrome, also known as Nager acrofacial dysostosis, was first described by Nager and deReynier in 1948. The patients are commonly presented with micrognathia and a preventive tracheostomy is necessary when there are symptoms of upper airway obstruction. Mandibular distraction osteogenesis is considered as an effective procedure, which not only improves micrognathia but also minimizes the chance of the tracheostomy. However, mandibular distraction osteogenesis has some complications, such as relapse, teeth injury, infection and injury of the temporomandibular joints.

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