Editorial Commentary: Return to Sport: An Ill-Defined Parameter.

Femoroacetabular impingement syndrome (FAIS) is a common cause of hip pain and dysfunction in athletes, which can impair their ability to perform and compete in sports. Hip arthroscopy has become a popular and successful treatment option for the management of FAIS and the return to sport (RTS) of athletes. The concept of RTS has evolved in the last years. Various different factors need to be considered when evaluating RTS after hip arthroscopy for FAIS, such as (1) the definition of RTS (return to participation, RTS, return to performance), (2) the sport type (high-impact vs low-impact) and sport level (professional vs recreational), and (3) the time to follow-up evaluation. In addition, return to high-impact sports, such as soccer, might not be the best recommendation for some patients undergoing hip arthroscopy for FAIS, as it may accelerate the degeneration of the hip joint. Future research should consider all these aspects of the RTS outcome after hip arthroscopy for FAIS. Valid RTS rates are of utmost importance to provide adequate expectations to patients and to guide decision-making of hip surgeons.