I found another tidbit of info:
" If a player has a legitimate long-term injury, his cap hit is still counted; however, the team is permitted to replace him with one or more players whose combined salary is equal to or less than that of the injured player, even if the additional players would put the team over the salary cap (if the team's cap room is larger than the injured player's cap hit, they may take on as much as their cap room); however, the injured player may not return to play until the team is again compliant with the original cap".