Increased Prevalence of Generalized Joint Hypermobility Observed in Patients With Recurrent Temporomandibular Joint Dislocation

Background:Generalized joint hypermobility (GJH), determined by the Beighton score, is a fundamental part of diagnosing benign joint hypermobility syndrome (BJHS), which may also present extraarticular manifestations, and is determined by the Brighton criteria. Purpose:This study was designed to investigate whether there is an association between recurrent temporomandibular joint (TMJ) dislocation and these disorders. Study design, setting, and sample:A retrospective cross-sectional study was conducted. Hospitalbased patients with a history of recurrent TMJ dislocation were compared to population-based patients that did not experience TMJ dislocations or any other TMJ disorders. Age and sex matching were performed between the study groups. All subjects reached the age of skeletal maturity. Predictor variable:A history of recurrent TMJ dislocations. Main outcome variables:Measurements of Beighton score (range from 0 to 9 with a score of $ 4 indicating GJH) and correspondence to the Brighton criteria (with at least two 'major' criteria or one "major"criterion plus two 'minor"criteria or four "minor' criteria indicating BJHS). Covariates:Included age and sex. Analyses:Mann-Whitney U-test for continuous variables and the c2 test or Fisher's exact test for categorical variables. Statistical significance was set at P < .05. Results:A total of 68 participants were included, of whom 34 patients presented with recurrent TMJ dislocations compared with a control population of 34. The Mean participants were 31.35  8.06 years, and 29.4% (n = 20) were males. Of the dislocation group, 16 (47.0%) patients had a Beighton score of 4 or higher. The Beighton sum score was significantly higher, with a TMJ dislocation group mean score of 3.06  2.8, compared with a control score of 0.82  1.1 (P = .001). A total of 58.8% (n = 20) of the TMJ dislocation group participants met the Brighton criteria versus none (0.0%) of the control group (P = .001).