There have just been 52 reported concussions amongst 400-some players since the NBA put its concussion testing protocol in place four years ago. Considering the speed and action that the game expects, the league is somewhat lucky to have so few amongst its ranks, even if the two suspected concussions to star guards Stephen Curry and Klay Thompson set the NBA on its ear last week. [ Follow Dunks Don't Lie on Tumblr: The best slams from all of basketball ] During the Western Conference finals Curry fell on his head and Thompson took a shot to the head from Houston's Trevor Ariza, who was also inadvertently involved in the collision that sent Curry to the floor . Both Golden State Warrior guards were cleared to return to action following a run through the league's concussion protocal tests, with Stephen returning for some so-so action in the second half of Game 4 and Thompson being held out at the last minute after doctors discovered a cut to his ear in Game 5 . Both displays also scared the hell out of a league that hasn't had to deal with as much all that often, because NBA players don't exactly queue up at the line of scrimmage dozens of times a game. This is why National...