BackgroundThe stress fracture of the fifth metatarsal bone (5MT) frequently occurs in youth soccer players in Japan, and it is very important issue to prevent this fracture.ObjectiveTo confirm whether preventive intervention successfully reduced the incidence of 5MTDesignObservational cohort study to compare the occurrence of 5MT before (2003–2009) and after (2010–2016) intervention.SettingOne football (soccer) club in Japan.Patients (or Participants)One hundred and fifty-nine elite Japanese youth (under 18) football (soccer) players belonged to one football club from 2003 to 2016. The incidence of 5MT were compared before intervention (7 years) and after intervention (7 years).Interventions (or Assessment of Risk Factors)We proposed the prevention strategy on 2010 based on our clinical experiences and past publications regarding with 5MT (https://saita0617.wixsite.com/jones/english-ver ). Main Outcome MeasurementsIncidence of 5MT.ResultsThe incidence of 5MT before intervention was 11 cases, while it was decreased to 2 cases after intervention. The hazard ratio for the incidence of 5MT was 3.99 (95%CI: 1.06 to 15.05, p=0.04) in the 88 soccer players prior to prevention compared with 71 players post prevention.ConclusionsThe p...

181 Prevention of fifth metatarsal bone stress fracture in youth Japanese soccer players

10.1136/bjsports-2021-IOC.166