Sever trismus due to myositis ossificans traumatica: A case report

Abstract

There have been very few reports on rnyositis ossificans traumatica of the masseter muscle. This paper deals with an experience of ours, a 32-year-old male patient with severe trismus caused by myositis ossificans traumatica. He was struck on the left side of the face and was unable to open his jaw after the injury. On admission a maximum interincisal opening of 3 mm was noticed and a mass was plapable in the injured lesion.
There were no abnormal findings via hematological studies including alkaline phosphatase. Diagnosis was made from clinical findings plus CT, echo, and soft-X-ray. Surgical treatment, partial massetectomy and excision of the mass in the left masseter, was carried out and an interincisal opening of 45 mm was achieved at the time of the operation. Microsections of the mass showed heterotopic ossificans and no evidence of malignancy.
The active physiotherapy was given postoperatively. A favorable clinical response was achieved.