Originally Posted by smegmavike
The question will remain what was it that caused the fluid in the knee to begin with. Was it just from a bump that caused some sort of inflammation or is this a sign that there is something damaged in there that was missed?
I know that when I tore my ACL, MCL and Meniscus in high school there was swelling initially but I have never had any fluid buildups that had had to be drained. Even after the repair failed and the ligament was torn and wore away and with a few decades of cartilage damage from running around without it I have never had a swelling problem. OTOH a good friend tore his ACL around the same time and went with the replacement cadaver repair and he was constantly having to have the knee drained but I believe his repair held up over time. it seems to me that fluids generally don't build up unless there is something wrong to trigger the body to release them. Is a general contusion enough to cause that?
The question is whether the swelling is within the joint capsule or something like a bursa sack swelling, which occurs outside the joint. One could be a problem, the other shouldn't.
Originally Posted by Purple Floyd
Inflammation or bleeding cause swelling.
If the meniscus is intact, he should be fine.