Cam morphology of the hip arises before, and does not further increase after closure of the proximal femoral growth plate in youth soccer players: a prospective study with a minimum of 5-year follow-up. (April 2018) - van Klij, P.; Heijboer, M.P.; Ginai, A.Z.; Verhaar, J.A.; Waarsing, J.H.; Agricola, R.