Cam-type femoro-acetabular impingement (FAI) is a frequent cause of anterior hip pain. It is more common in athletes and men. Its prevalence increases with age. Primary cam develops at physeal closure in adolescence, during sustained and repeated sporting activities. Secondary cam can occur following slipped capital femoral epiphysis, Legg-Calvé-Perthes disease or trauma. Standard radiographs of the pelvis, hip arthro-MRI and CT coxometry are used to assess the location and intensity of cam. Increased alpha angle and decreased head-neck offset are the two main radiological parameters associated with cam. Treatment is conservative in the first instance, including modification of activities, physical therapy and infiltrations. If conservative treatment fails, hip arthroscopy or hip dislocation surgery can be used to correct the cam. The results in terms of symptomatology and return to sport are good. However, it has not yet been established whether resection of the cam reduces the risk of hip osteoarthritis in the long term.