Coronoid process of the mandible

Between this ridge and the anterior border is a grooved triangular area, the upper part of which gives attachment to the temporalis, the lower part to some fibers of the buccinator.

Clinical significance

Fractures of the mandible are common. However, coronoid process fractures are very rare. Isolated fractures of the coronoid process caused by direct trauma are rare, as it is anatomically protected by the complex zygomatic arch/ temporo-zygomatic bone and their associated muscles. Most fractures here are caused by strokes (contusion or penetrating injuries). Conservative management of minor fractures can lead to trismus (lockjaw) that can later only be corrected by removing the coronoid process. For serious fractures, a surgery involving open reduction and internal fixation can have good outcomes.