PReS-FINAL-2264: Three middle fingers width correlates with maximum mouth opening and is a reliable parameter to identify joint hypermobility in schoolchildren

Methods We conducted a cross sectional study in a cohort of healthy schoolchildren, aged 8-13 years, by collecting information on family history of GJH and on history of TMJ involvement and performing a physical examination. This included height, weight, body surface area (BSA), body mass index (BMI), and musculoskeletal examination focused on the presence of GJH according to the Beighton criteria (BS≥4/9). TMJ evaluation included a complete gnathological visit, aimed to investigate the presence of TMJ disorders and to evaluate the MMO. The evaluation of TMFW was also performed and the Mouth Opening Ratio (MOR) was consequently calculated by the formula (MMO-TMFW)/MMOx100, adopting a 10% cut-off value to define the TMJ hypermobility.