This descriptive epidemiological study was conducted between January 1, 2005 and October 10, 2010. The study included dancers who were members of the main Spanish ballet companies and who suffered injuries and were diagnosed and treated in the  Trauma and Orthopaedic Surgery Service at Fremap  in Madrid. To evaluate the influence of age and years of professional practice on the occurrence of injuries, the researchers divided the subjects into 3 age groups: junior (≤ 21 years with a professional average of 2.5 years), intermediate (between 22 and 31 years with a professional average of 7.83 years) and senior (≥ 32 years with a professional average of 16.19 years). Taking into account that the population of these three groups experienced certain variations during the study period, the values of the different parameters were obtained based on the number of registered injuries and not on the number of dancers studied. The prevalence of overuse injuries was 0.239 injuries per 1000 ...