Fixation of both feet is assumed to protect against knee injuries .
It is likely that this effect will be reduced in elite performers as the impact energy and torsion forces increase with the higher and more spectacular jumps taken by contestants .
Fixation of both feet is assumed to protect against knee injuries , but it is likely that this effect will be reduced in elite performers as the impact energy and torsion forces increase with the higher and more spectacular jumps taken by contestants .