Risk factor analysis and idiographic features of mandibular coronoid fractures: A retrospective case–control study

Abstract

This study aimed to identify and distinguish various factors that may influence the occurrence of mandibular coronoid fractures. From January 2000 to December 2009, a total of 1131 patients with maxillofacial fractures were enrolled in this statistical study to evaluate the association between mandibular coronoid fractures and other risk factors. Among these patients, 869 had mandibular fractures, and 25 sustained a total of 25 coronoid fractures. More than half (13 of 25 patients, 52%) of the coronoid fractures in these patients were caused by motor vehicle accidents. Among these coronoid fractures, seven were associated with other mandibular fractures, and 23 (92.0%) were related to midfacial fractures. The most common site of midfacial fracture was the zygomatic arch (20 patients, 80%). Multivariate logistic regression analysis revealed that the most important influencing factor was the zygomatic arch fracture (odds ratio, 9.033; 95% confidence interval, 1.658, 49.218; p = 0.011). The majority of coronoid fracture fragments (19 of 25, 76%) were removed during operation. The most commonly used incision is hemicoronal or bicoronal approach (16 of 19, 84.2%).

Coronoidectomy as a treatment for mandibular immobility caused by fracture of the coronoid process in three horses

“…Most fractures of the coronoid process of human patients are caused by trauma and are associated with concomitant fracture of the zygomatic arch (Zhou et al . 2017). Treatment of human patients for fracture of the coronoid process may be conservative if the process is not displaced but is likely to be surgical if the process is displaced.…”

Clinical, retrospective case-control study on the mechanics of obstacle in mouth opening and malocclusion in patients with maxillofacial fractures

“…Our previous study revealed that majority of the patients who sustained coronoid fractures also had fractured zygomatic archs (20 of 25 patients, 80%). Furthermore, nearly all patients (23 of 25 patients, 92%) with coronoid fractures showed limited mouth opening 5 . We propose that the fracture of the zygomatic arch or coronoid processes is usually attributed to the muscle compression or mechanical barrier in the process of mouth opening and closing, thus leading to the serious limitation in mouth opening.…”

“…The masticatory muscles and temporalis are squeezed by the fracture of the zygomatic arch or coronoid process, resulting in reduced or dysfunctional muscle in the traction and shrinking process. In our experience, coronoid fracture removal is usually conducted when limited mouth opening cannot be resolved after the open reduction of maxillofacial fractures 5 .…”

“…More seriously, maxillofacial fractures are difficult to treat effectively and accurately 3 . Accordingly, postponed or inappropriate intervention may lead to the malformation of osseous callus and soft tissue fibrosis 4 , and even the occurrence of facial deformity (facial depression 5 , temporomandibular joint ankylosis and micrognathia 6 ).…”

“…In previous studies, we analysed the mechanisms in the production of mandibular fractures 5 , 7 – 10 and evaluated various factors that are correlated with maxillofacial fractures 11 – 16 . In the present study, we attach more importance to the symptoms of patients who sustained maxillofacial fractures.…”