The West Coast forward will miss up to six weeks with the injury, which occurred during a collision with Fremantle's Tendai Mzungu on Saturday night.
There have been suggestions the reason LeCras opted to keep his feet and brace for the impact rather than go to ground in pursuit of the ball was a consequence of the new 'forceful contact below the knees' rule.
But the suggestion has been quashed by Gieschen.
"We've been bumping shoulder to shoulder, body to body, hip to hip, for as long as the game's been in existence," Gieschen told AFL.com.au on Tuesday.
"It's a body contact sport, so I was a bit bemused that people tried to draw a bow between two players bumping standing upright, and what the new contact below the knees rule had brought in.
"I found it interesting for people to even mention that because accidents do happen in football.
"People collide, we have broken collarbones, we have broken ribs through collisions like that every game, every week of the year."
Gieschen threw his support behind a decision from Friday night’s Adelaide and Essendon game that resulted in a shot at goal for the Bombers’ Alwyn Davey, after Brent Reilly slid into his lower legs.
"The Reilly and Davey one resulted in a set shot for goal, and I think people get excited about that," Gieschen said.
"But I think everybody who saw it knew that was exactly why the rule was brought in - to prevent players from electing to go to ground and crashing into the lower legs of their opponent."
Overall Gieschen was satisfied with how the rule changes were received, and how they were adjudicated, in the two opening games of the round.
"We had two games, three free kicks, an average of 1.5 a game," Gieschen said.
"It's not as though it's in gigantic proportions at the moment, and we think the players and the clubs have adapted really well."
