Abstract
Extra-articular ankylosis resulting from bony union between the coronoid process and the zygoma is very rare. It may result from facial fractures caused by gunshots, treated or untreated facial fractures or may arise as an extension of intracapsular ankylosis. We report a case of ankylosis between the coronoid process and the zygomatic arch in a 33-year-old Black male. The bony ankylosis was the result of a 2 year old untreated zygomatic arch fracture. Ankylosis developed secondary to heterotopic bone formation following trauma. The patient was treated by intra-oral coronoidectomy, followed by physiotherapy for three months. He returned for review one year later with a mouth-opening of 40 mm and a stable occlusion.
Highlights
Bony union between the coronoid process (CP) and the zygoma is a very rare cause of extra-articular temporomandibular joint ankylosis [1]
We report a case of ankylosis between the coronoid process and the zygomatic arch in a 33-year-old Black male
The bony ankylosis was the result of a 2 year old untreated zygomatic arch fracture
Summary
Bony union between the coronoid process (CP) and the zygoma is a very rare cause of extra-articular temporomandibular joint ankylosis [1]. It may result from facial fractures caused by gunshots, [2] treated or untreated fractures of the zygoma complex [3] [4] [5] with or without concomitant fractures of the CP, [6] chemical burns, mandibular fractures, [7] infection involving the infratemporal fossa, [8] local surgical complications [3] [9] [10] myositis ossificans [11] and extension of intracapsular ankylosis [10]. We report a case of ankylosis between the CP and the zygomatic bone in a 33-year-old Black male This bony ankylosis was the result of an untreated zygomatic arch fracture sustained in a motor vehicle accident two years previously
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