OC1 Facial Bone Mineral Density: A Potential Indicator For At Risk Injury Groups

Abstract

Sports related facial injuries are most prevalent amongst young men aged 16–30 yrs, with male to female injury ratios as high as 19:1. The most common site of injury is the mandible followed by the mid-face. The severity of injury can have a detrimental effect on health and return to sport. Differences in facial structure and strength may be a key element to the success or failure of protective equipment in relation to these injuries. Twenty six healthy male adults (14 Caucasian (C), 12 African Caribbean (AC); mean age (21 ± 1.7 y)) were matched for height (1.79 ± 0.08 cm) and mass (84 ± 16.4 kg). All participants had bone mineral density (BMD) measurements obtained by a Discovery QDR DXA scanner (Hologic Inc, USA). Measurements were taken at the lumbar spine (LS), femoral neck (FN) and facial sites; mandibular ramus (R) and body (Mb). Multivariate statistical analysis was conducted on both groups. Mean BMD for R were 0.65 ± 0.28 g/cm2 for C and 0.92 ± 0.25 g/cm2 for AC, Mb were 1.40 ± 0.34 g/cm2 for C and 1.45 ± 0.36 g/cm2 for AC. A significant (F = 3.752, p < 0.05) ethnicity affect was detected across all BMD sites with the highest significance at the ramus (p < 0.0125). Correlations between BMD for the two facial sites were not statistically significant for the C group (r = 0.323, p > 0.05), but was for the AC group (r = 0.636, p < 0.05). Whole body analyses showed no significant correlations (p > 0.05) between facial sites and FN or LS BMD for either cohort. Mean R and Mb was higher in the AC than C group but both demonstrated high and low values. Mandibular BMD has previously been assessed in osteoporosis and implant design studies. Thus, individuals with lower BMD could be more susceptible to facial injury, particularly if they do not wear facial protection or compete in sports where weight maintenance is important. Our findings highlight that some individuals may be more susceptible to facial injury and therefore, facial protection in sport should be worn and more customised to the individual.