Contralateral Coronoid Hyperplasia in Patients Undergoing Hemimandibulectomy With Disarticulation: A Case Series

Trismus, the clinical sign of restricted jaw movement, can result from pathology in a variety of structures around the oral cavity. Among the general population, the normal Kr′-Go′/Cd′-Go′ ratio was found to be less than 1.07, which coincides with the preoperative mean Kr′-Go′/Cd′-Go′ ratio of 0.92 in our series. Our study sample showed a minimal increase in the Kr′-Go′/Cd′-Go′ ratio over the first 6 postoperative months, but the number of patients was not sufficient to conclude causality. The etiology of coronoid hyperplasia remains unclear, but the role of increased temporalis muscle activity cannot be excluded. We recommend the Levandoski analysis for patients who had hemimandibulectomy with disarticulation who complain of prolonged limited mouth opening. We also recommend considering coronoidectomy as a treatment option for those with persistent trismus and radiographic signs of coronoid hyperplasia.