FEMORAL NECK STRESS FRACTURES IN ROYAL MARINES RECRUITS: DIAGNOSIS AND IMAGING

Recruits undergoing arduous training at Commando Training Centre Royal Marines (CTCRM) carry a higher risk of femoral neck stress fractures than many other military populations. This injury has serious sequelae and requires urgent operative fixation if it is displaced. Existing literature advocates a low threshold for imaging patients where this injury is suspected, due to the prognostic advantage conferred by early intervention. CTCRM uses a locally produced scoring system based on history and clinical assessment, to guide the requirement for imaging. Since 2015 access to MRI has been possible through a fast track provider. Between 2012 and 2015, 3522 Royal Marine Recruits entered training. Over the period, 95 MRI scans of the hip were performed, of which 12 utilised private pathways. 13 stress fractures of the femoral neck were identified; 23% (n=3) were displaced and required fixation. The overall incidence rate for this injury is therefore 37 per 10,000, with a displaced incidence rate of 9 per 10,000...