There is a difference between being able to run and the impact that comes with sports, especially wrestling. Running can be easy depending on the knee injury, but when you factor in twisting and turning on a knee, jumping and landing with force, it's alot of wear to put on a surgically repaired meniscus so recovery needs to be lengthened to insure its back to full strength.
I've torn my ACL, had it surgically repaired only to tear it again. Running at full sprint in a straight line on a torn ACL is not a problem despite this, but when it comes to pivoting or jumping around it's a different story.
Then again, everybody is different, some people do recover quicker.