MRI EVALUATION OF ARTICULAR DISC POSITION AFTER ORTHOGNATHIC SURGERY WITH OR WITHOUT CONCOMITANT DISC REPOSITIONING: A RETROSPECTIVE STUDY: MRI Evaluation of Articular Disc Position after Orthognathic Surgery

Abstract Objective The aim of this study was to compare the outcomes of two surgical treatment options for correction of Class II malocclusion skeletal deformity once the ideal management of subjects, with preexisting temporomandibular joint (TMJ) disorders, who require orthognathic surgery (OS) for correction of dentofacial deformity, is still controversial. Study Design This retrospective study evaluated subjects who underwent OS with maxillomandibular advancement (MMA) with or without concomitant TMJ surgery for articular disc repositioning (ADR). Subjects were divided into two groups: Group-I (MMA) - treated with OS only (18 subjects); Group-II (MMA-ADR) - treated with OS and concomitant ADR (19 subjects). The sample consisted of 74 TMJs (mean age: 29.86 years). Results In Group-I, 38.5% of the discs that were originally in normal position became displaced after OS and 33.3% of displaced discs with reduction became nonreducing after OS. In Group-II, 78.9% of discs exhibited normal position in the final evaluation and 97.3% of subjects showed improved disc position after surgery. There was significant symptoms improvement in all subjects in Group-II, but no significant improvement in Group-I. Conclusions Concomitant OS with ADR appears to be stable and beneficial in improving symptoms in subjects with displaced disc and TMJ pain.